Test equipment: a modern bench
The maintenance manual lists every instrument needed to align an MX-5050 — in 1976 terms (Table 1-1). This page maps each one to what you'd buy today: a used/vintage route and new gear at three prices, traced back to what the tests actually demand.
Two things surprised me putting this together. First, the manual's own 1976 shopping list doesn't survive contact with the manual's own procedures — two of its suggested instruments fail requirements printed a few pages later. Second, the cheapest modern route for three of the six electronic instruments is a USB audio interface and free software — and with the right interface, that's checkable against the same numbers rather than taken on faith.
What the tests actually require↑ TOP
Before shopping, here's what the procedures actually demand of each instrument, with the manual section that imposes it:
| Instrument | What the tests demand | Manual section |
|---|---|---|
| Audio oscillator | Residual distortion under 0.1%; sweeps 30 Hz–22 kHz; clean spot tones at 1 kHz, 10 kHz, 15 kHz, 18 kHz; output settable 14 dB below operating level | 3-4-(2), 3-6-(4), 3-6-(2) |
| AC voltmeter (VTVM) | Reads dBm directly at 0, +4 and −10 dBm; resolves ±2 dB response readings; resolves a noise floor tens of dB below +4 dBm for the S/N test | 3-5-(2), 3-5-(4), 3-4-(1) |
| Frequency counter | Discriminates a ±0.2% window around 3000 Hz — 2994 to 3006 Hz | 3-4-(5) |
| Flutter bridge | Resolves well below 0.03% rms (the test tape's own residual) and the 0.05% machine spec; has a selectable NAB-weighted position | 3-4-(6) |
| Wave analyzer | Bandwidth adjustable to 100 Hz; reads individual harmonics at the 0.5% level; resolves floors of 55–60 dB (crosstalk) and 65 dB (erasure) | 3-4-(2), 3-4-(3), 3-4-(4) |
| ASA noise filter | "A"-weighted filter ahead of the voltmeter; S/N targets 64–68 dB depending on model and speed | 3-4-(1) |
| Volt-ohm meter | Sensitivity ≥ 20,000 Ω/V — the only numeric spec Table 1-1 gives it | 1-1 |
| Alignment test tapes | Speed/EQ/standard combinations per Table 1-2 | 1-1, 3-2 |
| Spring scales | Brake tension 100–275 g; tape tension 40–77 g; pinch roller pressure 6.4–7.0 lb | 2-2, 2-3, 2-4 |
There's an independent check on whether these numbers are real-world honest: Audio magazine's April 1976 bench test measured a production machine against them. The measurements confirm the bar the manual sets — and in one case raise it:
| Measurement | Audio's figure | Manual spec | What it means for the gear |
|---|---|---|---|
| Wow and flutter | 0.07% at 7½ ips, 0.06% at 15 ips (DIN weighting) | 0.05% at 15 ips, 0.06% at 7½ ips (NAB weighting, Table 3-3) | Meter must resolve well below 0.05% and ideally offer both NAB and DIN positions to reconcile the two figures |
| Signal-to-noise | −66 dB ("A" weighted, ref. 0 VU) | 68 dB (2-track) / 65 dB (4-track), ASA weighted | Voltmeter behind the weighting filter must resolve a floor 65–75 dB below the reference tone |
| Distortion | 3% THD not reached until nearly +9 VU | 2nd harmonic ≤ 0.5%, 3rd 0.5–0.8% | Analyzer must cleanly resolve fractional-percent harmonics |
| Frequency response | −3 dB at ≈28 kHz at 15 ips | ±2 dB over 35 Hz–22 kHz at 15 ips | An oscillator that stops at the manual's own 22 kHz top frequency can't reproduce Audio's measurement — buy headroom |
| Crosstalk | −58 dB | 60 dB (2-track) / 55 dB (4-track) | Analyzer must resolve near a 55–60 dB floor |
Audio oscillator↑ TOP
The requirement: under 0.1% residual distortion, a 30 Hz–22 kHz sweep, clean spot tones from 1 kHz to 18 kHz, and output settable 14 dB below operating level — the 700 Hz reference tone used elsewhere in alignment comes off the alignment test tape itself, not this instrument — 3-4-(2), 3-6-(4).
Here's the first surprise, and it belongs to Otari rather than to HP. The manual lists exactly one audio oscillator — the Hewlett-Packard 200CD — and scopes it, in Table 1-1, to "overall frequency response and signal-to-noise measurement". It never proposes the 200CD for the distortion test; that row of the table hands distortion to the wave analyzer instead.
Just as well, because the 200CD could not do it. HP's own specification sheet rates the instrument at 0.2% distortion from 20 Hz to 200 kHz — exactly twice the 0.1% the manual demands, at exactly the 1 kHz that 3-4-(2) tells you to use. (HP's worse figure, 0.5%, applies below 20 Hz and above 200 kHz — outside this job entirely.) A diyAudio poster with hands-on experience rates stock units worse still, needing a factory modification to reach 0.05%.
So the gap is in the equipment list, not in HP's honesty: buy everything Table 1-1 asks for and you still cannot run the manual's own distortion test. It needs a cleaner oscillator than Otari thought to name. Don't hunt down a 200CD for this job.
Used: the Hewlett-Packard 339A Distortion Measurement Set — roughly A$600–5,200 landed on eBay AU as of July 2026, highly shipping-sensitive since nearly all stock is in the US. Its internal oscillator spans 10 Hz–110 kHz at 1 mV–3 V into 600 Ω with residual THD verified under 0.0018% — two orders of magnitude inside the requirement. Its built-in true-RMS voltmeter means one box can also stand in for the AC voltmeter below.
New — budget: the software bench — a USB audio interface driven by REW's signal generator. From A$159; details and the honest caveats in that section.
New — mid: the QuantAsylum QA403 audio analyzer — US$599, ≈A$865 before shipping and GST, direct from quantasylum.com. Generator THD −115 dB per the product sheet — three orders of magnitude inside the requirement. A USB-tethered analyzer that replaces the oscillator, the AC voltmeter and the wave analyzer in one box.
New — pro: the Stanford Research Systems DS360 ultra-low-distortion generator — US$4,095 list, ≈A$5,900 before shipping and duty (thinksrs.com; the Australian distributor Coherent Scientific quotes on request). THD typically −110 dB (≈0.0003%) below 5 kHz, range 10 mHz–200 kHz. This is the specialist choice: a standalone lab-grade generator that does nothing but produce an ultra-pure tone — priced well above the do-everything QA403, and worth it only if a dedicated signal source is what you want on the bench.
What owners say: a long-term 339A owner calls a cosmetically rough unit "a very competent piece of measuring equipment" with distortion below what a sound card can resolve, but advises having decades-old calibration re-verified; diyAudio lists the HP 339 among the short list of ultra-low-distortion sources still findable secondhand cheaply. An Elektor reviewer who bought his QA403 review unit calls it "the right choice" for semi-professional work — roughly 10 dB shy of an Audio Precision APx555 at a fraction of the price.
AC voltmeter↑ TOP
The requirement: reads dBm directly against the 700 Hz reference tone at 0, +4 and −10 dBm, resolves ±2 dB response readings, holds a visible maximum for azimuth nulling, and resolves the S/N noise floor tens of dB below reference — 3-5-(2), 3-5-(3), 3-4-(1).
Used: this is the easy vintage buy. The manual suggested the HP 400-series, and they're plentiful — roughly A$150–620 landed on eBay AU as of July 2026. The HP 400D/H/L manual specifies −72 to +52 dBm in 12 ranges at ±2% full-scale accuracy — everything the procedures ask, with headroom. The Leader LMV-181A millivoltmeter is the popular alternative (most tested units land around A$340–500 via eBay AU); its manual shows −60 to +50 dB in 12 ranges, dual-calibrated in dBm and dBV.
New — budget: the software bench — the interface's input read through REW's level meters, calibrated once against a real reference.
New — mid: the B&K Precision 2831E bench multimeter — A$981.87 inc. GST at element14 Australia. AC measurement to 100 kHz with built-in dBm math per the datasheet — set the dBm reference impedance to 600 Ω to match the manual's convention.
New — pro: the QuantAsylum QA403 again — input noise floor −115 dBV, amplitude accuracy better than ±2% per the product sheet. One catch: it reads dBV natively, not dBm — a fixed +2.2 dB offset at 600 Ω, where the vintage HP and Leader meters read the manual's units directly.
What owners say: a Tapeheads member who owns several HP meters recommends the solid-state 400EL and warns buyers to check meter-face condition — cracking and peeling is common and can be a dealbreaker. Another Tapeheads thread repeatedly recommends "sticking with the Leader meters," noting the dual dBm+dBV scale matters because service manuals reference one or the other inconsistently.
Frequency counter↑ TOP
The requirement: just one number — discriminate a ±0.2% window around the 3000 Hz speed-test tone, i.e. 2994–3006 Hz — 3-4-(5).
Used: the manual's own suggestion still holds up: the HP 5300A mainframe + 5301A counter plug-in lands at roughly A$270–570 from eBay AU as of July 2026. Six digits on a 1-second gate resolves about 1 Hz at 3 kHz — comfortably inside the ±6 Hz window (specs, gate-time details).
New — budget: honestly, there isn't one. The obvious candidate — the frequency-counter mode of the A$159 OWON XDM1041 bench multimeter — is rated at ±(0.2% + 10 counts). At 3000 Hz the ±0.2% term alone is ±6 Hz — the entire width of the window it's supposed to discriminate, before the count term is added. Its worst-case rated error equals or exceeds the tolerance it must verify, and averaging doesn't rescue a systematic accuracy bound. Not recommended without an independent calibration check against a known reference.
New — mid (the default): the Aim-TTi TF930 — A$850 new and genuinely AU-stocked at Emona Instruments, Sydney. Resolution to 0.001 Hz — several thousand times finer than the ±6 Hz window demands.
New — pro: the Keysight 53230A — from US$6,858 list, ≈A$9,880 (keysight.com). Twelve digits per second. Lab-grade overkill for a ±0.2% job; listed for consistency, not proportion.
What owners say: a long-time Tapeheads contributor endorses exactly this workflow — a vintage period/frequency counter paired with a wow-and-flutter meter "gives me W+F, speed deviation as a percentage and actual speed frequency" (his counters are period Leader models, same class as the HP).
Flutter meter↑ TOP
The requirement: resolve well under 0.03% rms — the residual of the flutter test tape itself — against a 0.05% machine spec at 15 ips, with a selectable NAB-weighted position — 3-4-(6).
That NAB requirement turns out to be the hard filter. Most surviving vintage meters and all the software tools I could verify support DIN, IEC or JIS weighting — not NAB.
Used (and this is also the budget lane): the Meguro MK-668 series — roughly A$608–639 landed from eBay AU as of July 2026. The archived Meguro spec page confirms a dedicated NAB average-value mode, ranges down to 0.01% full scale (floor 0.0015%), a crystal-controlled 3 kHz/3.15 kHz oscillator for the manual's record/playback loopback method, and a built-in 4-digit frequency counter that can double for the instrument above.
New — budget (software): no verified option exists. I checked the two candidates against the rule that NAB weighting and sub-0.03% resolution must both be verifiable. WFGUI fails both — its own documentation offers only DIN-family weighting and a coarsest-usable 0.1% range. Virtins Multi-Instrument clears the resolution bar with real published loopback figures but its own technical document implements AES6-2008/IEC/DIN weighting — no NAB mode. So the budget lane falls back to the used Meguro above, which is the least expensive spec-compliant route found, full stop.
New — mid: no viable candidate. Dedicated wow-and-flutter meters are no longer manufactured, and both modern analyzers recommended elsewhere on this page were specifically checked for a W&F function — the dScope Series III doesn't have one, and neither does the QuantAsylum QA40x software. An honest gap, not a guess.
New — pro: Audio Precision APx500 platform + the free APx Wow and Flutter Measurement Utility — quote-only; no APx price is published, but going by list prices of comparable lab-grade instruments, budget US$6,800+ for the analyzer. The utility implements AES6-2008/IEC 60386 weighted flutter; the page does not name NAB, so even this lane isn't confirmed compliant — flagged rather than assumed.
What owners say: thin, honestly — the only substantive thread found is a single MK-668C owner reporting a just-bought unit powering up and counting frequency correctly, with an input-triggering quirk under investigation. Worth knowing before bidding. (The better-known Leader LFM-39A gets warmer owner reviews — but its own manual documents JIS/CCIR/DIN weighting with no NAB mention anywhere, so it doesn't meet this manual's procedure as written.)
Wave analyzer↑ TOP
The requirement: an analyzer with bandwidth adjustable to 100 Hz that reads individual harmonics at the 0.5% level, then gets re-patched for the crosstalk (55–60 dB) and erasure (>65 dB) tests — 3-4-(2), 3-4-(3), 3-4-(4).
The manual itself warns why a plain THD meter is the wrong tool here: tape flutter and modulation noise corrupt a lumped THD reading, so the instrument must tune to and read each harmonic separately. That warning also rules out pressing the HP 339A (the oscillator pick above) into this role — it's a THD set, not a selective analyzer.
And the second surprise: the manual's alternate 1976 suggestion, the HP 310A, fails the manual's own procedure. Its published bandwidths are 200, 1,000 and 3,000 Hz — there is no 100 Hz position, and it only tunes down to 1 kHz. The other suggestion, the HP 3590A, is legitimate but nearly extinct.
Used: the HP 3590A — if you can find one. eBay AU as of July 2026 shows a single parts-only unit (≈A$238 plus ≈A$190 freight); everything else is manuals. Its specs are right — a 100 Hz IF bandwidth position exactly as the procedure asks, 3 µV–30 V ranges — but I can't call a market of one parts unit a recommendation.
New — budget: the software bench — REW's FFT distortion measurement reads individual harmonics down to 0.01%. Covers the distortion test only; crosstalk and erasure have no documented software mode (details in that section).
New — mid: the QuantAsylum QA403 — ≈A$865, same unit as above. FFT sizes to 256k stand in for the selectable-bandwidth front end; the −115 dB floor per the product sheet resolves harmonics far below the 0.5% (−46 dB) requirement with 50+ dB of headroom below the crosstalk and erasure floors. This is the box that covers all three of the tests this instrument exists for.
New — pro: the Prism Sound dScope Series III — from US$4,395, ≈A$6,330, quote-only (specs). Its user-defined filter option sets the bandwidth to exactly 100 Hz rather than approximating it with FFT bins, and its residual THD+N floor (below −138 dB) is four orders of magnitude below the requirement.
What owners say: a GroupDIY member doing professional bench work says "the FFT on the dScope is excellent and I use that more than any other feature... levels, THD and viewing individual harmonics" all in one place. For the vintage route, the closest on-topic thread is general Tapeheads advice that distortion analyzers earn their keep "at the very end of the calibration session when I am documenting performance numbers" — the category matters, but 3590A-specific owner experience is effectively gone.
Two filters that aren't really purchases↑ TOP
Table 1-1 lists a bandpass filter and an ASA noise filter as separate line items. Neither is a shopping trip.
The bandpass filter row appears to be stale: no procedure in the general-information, performance-tests or transport-maintenance chapters ever calls for a standalone bandpass filter — the only bandwidth control any test uses is the wave analyzer's own front end, set to 100 Hz for the distortion test. If a use exists it's in Section 4 (head alignment), which this page's research didn't cover.
The ASA noise filter was never a product even in 1976 — the manual tells you to build it, showing the circuit in Fig. 3-1 "in a small aluminum box," patched between LINE OUT and the voltmeter for the signal-to-noise test. The modern equivalents keep that DIY spirit: a well-documented op-amp-buffered A-weighting filter build at Elliott Sound Products, or simply the A-weighting toggle already in the software — REW's SPL meter offers A, C and Z weightings, and the QA40x software has a built-in A-weighting switch plus custom curve loading. If you buy the QA403 for the wave-analyzer role, this filter comes free.
Multimeter↑ TOP
The requirement: Table 1-1 asks for 20,000 Ω/V sensitivity — a spec about meter loading on 1970s moving-coil meters. Every modern DMM has a fixed ~10 MΩ input and beats it on any range, so the manual's bar doesn't discriminate at all; these picks are on general bench merit.
Used: only worth it at the top end. A tested secondhand Fluke 87V runs roughly A$240–570 landed (eBay AU) against A$1,373.90 new — and an EEVblog thread on exactly this question concludes used units hold calibration well, with the caveats that the 87V needs closed-case factory calibration and Fluke's lifetime warranty doesn't transfer. In the budget and mid tiers, used isn't worth the freight.
New — budget: the UNI-T UT61E — A$112–140 landed from eBay AU. An independent review verifies ±0.1% DC accuracy, True RMS AC and a 22,000-count display. Two honest caveats from the sentiment: EEVblog's review thread flags weak input protection, and a teardown reviewer calls its CAT safety rating "demonstrably fictitious" while finding DC accuracy "spot-on." For line-level bench alignment — not mains work — the accuracy is what matters, and it checks out.
New — mid: the Brymen BM235 (EEVblog edition) — A$214 landed from the official EEVblog eBay AU store. UL-listed, independently tested to IEC 61010, True RMS, specs verified in the manufacturer's manual. Owner impressions are broadly positive — build quality and leads praised, gripes limited to a quiet continuity beeper.
New — pro: the Fluke 87V — A$1,373.90 inc. GST, in stock at RS Australia. ±(0.05% + 1) DC accuracy, True RMS to 20 kHz per the Fluke datasheet. The EEVblog consensus: "still viable but no longer the obvious choice" — exceptional durability, but better justified bought used.
Test tapes↑ TOP
There is no software substitute and no used route here — a calibration tape's entire value is an accurately known reference level, and a decades-old tape carries unknown level decay and wear with no way to re-verify it. Buy new. The good news: MRL (Magnetic Reference Laboratory) still cuts the exact ¼" formats the manual's Table 1-2 lists, and their online store now sells direct with a published Australia shipping policy — the only route I found with one.
One level note: MRL doesn't offer the manual's 185 nWb/m "Ampex operating level." Their own catalog documentation designates 200 nWb/m as the modern substitute — 1 dB hot relative to the manual's reference. Every Table 1-2 row maps:
| Manual tape (Table 1-2) | Speed | EQ | Modern MRL part | A$ (as of July 2026) |
|---|---|---|---|---|
| Ampex 01-31311-01 | 15 ips | NAB (50 µs & 3180 µs) | MRL 21J105 — top priority (my deck's high speed) | ≈A$230 (US$160) |
| Ampex 01-31321-01 | 7½ ips | NAB (50 µs & 3180 µs) | MRL 21T104 — priority | ≈A$230 (US$160) |
| Ampex 01-31321-04 (tracks 1 & 3) | 7½ ips | NAB (50 µs & 3180 µs) | MRL 21T104 — same part; at ¼" width one full-track recording plays correctly through a 2-track head | ≈A$230 (US$160) |
| Ampex 4690037-01 | 3¾ ips | NAB (90 µs & 3180 µs) | MRL 21F101-A | ≈A$230 (US$160) |
| Ampex 4690014-01 | 7½ ips | IEC (70 µs & ∞) | MRL 21T102 — only needed for IEC-mastered material | ≈A$230 (US$160) |
| Ampex 01-31313-01 | 15 ips | IEC (35 µs & ∞) | MRL 21J103 — same, secondary | ≈A$230 (US$160) |
Prices are MRL's own Publication 101 figures, ex freight and tax, cross-checked within a few dollars against US dealer Analog Tapes.
The speed and flutter tests use a separate tape — MRL's 3150 Hz Flutter and Speed Test Tape, from US$130 (≈A$187) direct from mrltapes.com: catalog 241-570-480-104 for 15 ips (rated ±0.03% flutter) and 231-570-480-107 for 7½ ips (±0.05%).
What owners say: a Tapeheads thread asking exactly this question (one participant runs an MX-5050 BII) lands where this page does: "MRL is fine... they are like Mitutoyo calipers — nice, and I have several, but does everyone need them?" — a fresh, traceable tape is worth the price for the one job it does, and buying used defeats the purpose.
The software bench↑ TOP
The budget lane for the oscillator, the AC voltmeter and (partly) the wave analyzer is one purchase: a USB audio interface plus REW (Room EQ Wizard), which is free. What each piece verifiably covers:
- Oscillator — REW's signal generator produces sines and sweeps up to half the sample rate — both interfaces below run at up to 192 kHz, clearing the manual's 22 kHz top frequency and the 28 kHz point Audio measured — with level steps of 0.01 dB, easily hitting the −10 dBm azimuth-check level.
- AC voltmeter — REW's level meters read RMS and peak-hold in dBu/dBV/volts. The absolute reading depends on a one-time soundcard calibration against a real reference — a DMM, or the vintage VTVM, once, at setup. Peak-hold satisfies the azimuth "maximum reading" procedure directly.
- Wave analyzer — distortion test only. REW's distortion measurement reads individual harmonics (to the ninth, down to 0.01% in its own worked example) with selectable FFT resolution — the software equivalent of the 100 Hz bandwidth control, and exactly the selective reading the manual's anti-THD-meter warning requires. No REW page documents a crosstalk or erasure mode — a restorer could improvise both with multi-input metering, but that's DIY routing, not a documented feature. The QA403 covers both properly.
- Flutter — no. See the flutter section: no software tool passes the NAB rule.
The interface matters as much as the software, because the analog specs live there:
Budget — Behringer UMC202HD, A$159 (djcity.com.au). The spec sheet gives it the best line-input headroom of anything tested — +20 dBu max on a dedicated line input, clearing the deck's +4 dBm line level with room to spare — and 10 Hz–50 kHz input bandwidth. Caveat from a diyAudio member who uses one for bench measurement: excellent for impedance work and driver behavior, but out-of-the-box distortion performance is tuned for music, not precision measurement — no calibrated THD figure exists for it, so treat its readings as comparative until you've checked it in loopback.
Mid — MOTU M2, A$379 (turramusic.com.au). This one has real measured numbers: Audio Science Review community loopback measurements started around −87 dB SINAD and improved roughly 10 dB after a firmware update — call it about −97 dB, matching MOTU's own spec. The manual's 0.1% oscillator-distortion bar works out to −60 dB, so the measured figure sits some 37 dB inside it. One real limitation from the spec page: the M2 has no dedicated line input — a +4 dBm deck output goes through the mic/instrument gain path, topping out at +10 dBu at minimum gain. Pad or attenuate, and verify headroom at your actual gain setting.
Honest limits of the whole approach:
- Test tapes stay physical. Software replaces the instruments that read what a tape produces, never the reference tape itself.
- Tape speed: resolution yes, absolute accuracy unproven. Software can resolve a 3 kHz tone far finer than the ±6 Hz window — about 1 Hz from a one-second FFT. But none of the three interface manufacturers publishes a sample-clock accuracy (ppm) figure, and no independent measurement of one was found. Cross-calibrate the interface once against a known frequency reference before trusting an absolute speed reading, or use a real counter.
- Crosstalk and erasure have no documented software mode, as above.
- All three interfaces have balanced inputs, which suits the deck's XLR line outputs.
Mechanical items and consumables↑ TOP
The rest of Table 1-1 — no electronics, mostly short answers.
| Item | Modern answer | A$ (as of July 2026) |
|---|---|---|
| Spring scale, 0–16 oz | Pesola Light-Line 500 g (model 10500) — covers all brake and tape-tension checks (40–275 g) | A$80.30 |
| Spring scale, 0–32 oz | Pesola Light-Line 1000 g (model 11000) | A$93.50 |
| Spring scale, 0–10 lb | Pesola Macro-Line 5 kg/10 lb (model 80015), dual oz/g scale, drag pointer — the 6.4–7.0 lb pinch-roller spec falls mid-scale | A$281.60 |
| Stroboscope | Honest gap: no procedure in the chapters researched actually uses one. The modern route to the same job is a laser tachometer (Jaycar QM1449) reading capstan RPM directly, converted to ips via the capstan diameter — a Tapeheads restorer corroborates the method (he used a handheld strobe, not this meter). Phone strobe apps carry no verifiable accuracy claims — unverified, not recommended | A$87.95 |
| Head demagnetizer | R.B. Annis Han-D-Mag 220-S — still in production, AU plug, stocked in Brisbane; or a used TEAC E-3 (~A$120 from AU sellers) | A$365 / ~A$120 used |
| Head cleaner | The 1976 Ampex solvent is long gone; modern Tapeheads consensus is 99% isopropyl for routine cleaning, denatured alcohol (metho) for heavy oxide buildup. The manual's own rule: head-cleaner solvent must never touch the pinch roller — next row | hardware store |
| Isopropyl / denatured alcohol | Same two bottles as above. Per the manual's cleaning section, alcohol is the only cleaner approved for the pinch roller and capstan; note the tension with the Tapeheads thread above, which cautions keeping any solvent off rubber rollers — follow the manual, but use it sparingly there | hardware store |
| Lubricating oil | Mobil DTE Oil Medium (ISO 46) is still a current product — but no Australian retailer was found stocking that exact grade at all, in any size. The closest AU-stocked oils are different lines (DTE Heavy Medium is ISO 68; DTE 25 Ultra matches ISO 46 but is a hydraulic-oil family), and both come only as 20 L drums — absurd for "2 or 3 drops" twice a year. An honest gap | gap — see note |
| Q-tips / swabs | Any pharmacy cotton buds | generic |
| Vacuum and brushes | Any small vacuum plus a soft artist's brush | generic |
| Allen wrenches | Any metric hex-key set (the manual never states sizes) | generic |
| Technician's tools | Screwdrivers, nut drivers, small pliers — the one Table 1-1 row with every column blank | generic |
| Test cables | XLR leads for line in/out, ¼" leads for the mic inputs, to suit whatever instrument is on the other end | generic |
There's also the gray-market route. AliExpress sells new-manufacture gear in several of these categories for a fraction of the prices above — some of it independently measured and genuinely good, most of it a lottery. The AliExpress bench covers it, verdict by verdict.
The whole bench at a glance↑ TOP
All prices AUD as of July 2026, ex freight unless a landed figure is noted; details and sources in each section above.
| Instrument | Used/vintage | New — budget | New — mid | New — pro |
|---|---|---|---|---|
| Audio oscillator | HP 339A, A$600–5,200 landed | interface + REW, from A$159 | QA403, ≈A$865 | SRS DS360, ≈A$5,900 |
| AC voltmeter | HP 400-series A$150–620 / Leader LMV-181A ~A$340–500 | interface + REW (same one) | B&K 2831E, A$982 | QA403 (same unit) |
| Frequency counter | HP 5300A+5301A, A$270–570 landed | none viable — see section | Aim-TTi TF930, A$850 | Keysight 53230A, ≈A$9,880 |
| Flutter meter | Meguro MK-668, ~A$608–639 landed | no software option — buy the used Meguro | none exists | APx500 + utility, quote-only (NAB unconfirmed) |
| Wave analyzer | HP 3590A — market of one parts unit | REW FFT, distortion test only | QA403, ≈A$865 | dScope III, ≈A$6,330+ |
| Multimeter | Fluke 87V, A$240–570 landed | UNI-T UT61E, A$112–140 | Brymen BM235, A$214 | Fluke 87V, A$1,374 |
| Alignment tapes | don't — buy new | MRL, ≈A$230 per tape, direct | — | — |
| Flutter/speed tape | don't — buy new | MRL 3150 Hz, from ≈A$187 | — | — |
The shape of the cheapest honest bench: a Behringer UMC202HD and REW (A$159) for oscillator, voltmeter and distortion work; a used Meguro MK-668 (~A$620 landed) for flutter and speed — it carries its own frequency counter; a UNI-T UT61E (~A$125) for continuity and DC work; the two priority MRL alignment tapes plus the 15 ips flutter/speed tape (~A$650 the three); Pesola scales, a Han-D-Mag, and hardware-store alcohol. Call it around A$2,400 before freight — a bench that can verifiably run every performance test in Section 3 except crosstalk and erasure, after a one-time loopback check of the UMC202HD to confirm it clears the distortion test's 0.1% bar, and a single QA403 (≈A$865) closes those last two.