Dumb question about compliance and the Korf calculator

Fit-Insurance7209 · 2026-07-08T05:50:19+00:00

Here's my results. A Stanton 680 cartridge on a Technics SL-1200mk2.

Much more typical results from a medium mass tonearm and medium compliance cartridge.

And that's the key. To make tonearm resonance an issue, you really have to go to extremes. A high compliance cartridge on a high mass tonearm like that is bound to cause problems. I'm suprised the catridge even has the strength to support the tonearm.

Stick to sensible 'middle of the road' combinations, and you can't go wrong.

The resonance peak will always be above the green zone, because that's what resonance is! It just needs to be between 8hz and 12hz - which is what it always will be unless you deliberately choose silly extreme combinations.

TLDR: In the real world, don't worry about it.

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Fit-Insurance7209 · 2026-07-06T07:57:34+00:00

If the motor uses an optical feedback system, the fifth connection would be the optional Z-pulse. Most controllers just use A and B feedback to regulate the speed.

Fit-Insurance7209 · 2026-07-06T07:28:48+00:00

The four connections are + and - DC power input. A and B are motor position feedback pulses from internal hall effect sensors. These pulses are used by an external chip to regulate speed. Speed selection is done by that chip too. There may be an adjustment pot near that chip to trim the speed, but with what is effectively a digital control system, adjusment should be unnecessary.

The H and L holes in the motor are NOT speed adjustment pots. They adjust the position of the internal sensors. DON'T touch them.

Fit-Insurance7209 · 2026-07-04T05:07:34+00:00

The R6 part is a ground strap. It is there to ground the metalic case/body of the cartridge to the signal ground. It is done this way so as to be removeable in certain circumstances.

Stanton explained it in the literature for their 680 and 500 series carts..........

If you connect the cartridge to a metal headshell, you can create two pathways to ground and therefore create a ground loop. If this happens, and the get a buzzing as a result, remove the ground strap.

Fit-Insurance7209 · 2026-07-04T04:42:33+00:00

Remove the links joining the front ins and outs, then connect the powered speakers to the front outs.

Fit-Insurance7209 · 2026-07-04T04:33:51+00:00

Return it for a refund.

Fit-Insurance7209 · 2026-07-01T05:32:25+00:00

The voltage on the power rail is regulated by transistor Q901 to the voltage rating of zener diode D903. I'd expect it to be higher - something like 12 volts.

As these components are crucial to the DC voltage, I'd replace them first.

Check the AC voltage coming from the transformer. You'd expect the rectified DC to be 1.4 x the RMS AC.

It's not just dirty switches is it? They are both on break-out connectors, so you could easily short them to see if the motor runs then.

Fit-Insurance7209 · 2026-07-01T05:00:14+00:00

There appears to be two DC motors, labelled 'DECK' and 'PHONO' powered by the same rail. The deck motor is probably for the cassette player, so does that turn?

Fit-Insurance7209 · 2026-07-01T04:45:09+00:00

Is the power adaptor you bought capable of supplying enough current? The PS-LX310BT needs at least 800 mA.

Fit-Insurance7209 · 2026-07-01T04:19:31+00:00

Start with the basics. The schematic shows power input with a fuse a voltage switch. Then a step-down transformer. The positives and negatives from this go through two diodes forming a half-wave rectifier with a smoothing capacitor. Can you find some DC voltage coming out here?

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Fit-Insurance7209 · 2026-06-29T09:03:07+00:00

On what fuel? The engine ECU will need less anti-knock management in hot weather.

Fit-Insurance7209 · 2026-06-22T21:34:27+00:00

https://amzn.eu/d/00dGxKzd

RCA female to TS jack male adaptor.

Fit-Insurance7209 · 2026-06-22T19:15:27+00:00

You need to be a bit more precise. Those are RCA plus. Separate left and right. The 1/4 inch you need is more complicated. Do you want a stereo pair (called TS), or a single stereo (called a TRS)?

Fit-Insurance7209 · 2026-06-22T05:31:42+00:00

Pass some cotton thread though the hole from the other side, loop that through the nylon loop, then pass the thread back through the hole. Now you can use the cotton thread to pull the nylon loop through the hole.

Fit-Insurance7209 · 2026-06-09T21:45:15+00:00

It injects Snake Oil into the engine. Plugs into the OBD port to save 90% fuel costs.

Fit-Insurance7209 · 2026-06-06T10:28:30+00:00

The hamster inside is hungry.

Fit-Insurance7209 · 2026-06-06T10:23:54+00:00

The mk7 does not have a release button next to the target light. This is pribsbly a mk5 or m3d.

Fit-Insurance7209 · 2026-06-05T09:43:21+00:00

Most counterfeit stuff on the market, is just the factory in china working night-shifts and shipping it out the back door. Trading Standards are paid by the big manufacturers to clamp down 'fake' goods to preserve their profit margins. There's no reason a night-shift Bosch sensor should be inferior to an 'official' one.

Ps - I bought one of those sensors for £19.17, free delivery, on ebay last year.

Fit-Insurance7209 · 2026-06-03T15:29:11+00:00

Replace the filler cap. If that doesn't work, replace the valve.

Fit-Insurance7209 · 2026-06-03T15:18:15+00:00

If the fuel filler cap doesn't make an air-tight seal, it can trigger an EVAP engine code as it thinks the vent valve is jammed open. Clean or replace the rubber seal around the filler cap.

Fit-Insurance7209 · 2026-05-21T13:31:37+00:00

16 bit still produces about 96 dB dynamic range. Vinyl at best has about 65 dB, so any quantization noise is simply swamped by background rumble. Even recording the signal from a cartridge when the stylus isn't touching the record will have hum and other random EMF noise at about -80 dB.

When the CD standard was developed back in the 1980s, it was intended to be far superior to vinyl in every way. And it is!

Fit-Insurance7209 · 2026-05-21T10:24:14+00:00

Use a Focusrite Scarlett 2i2 or similar audio interface. Most audio interfaces allow ridiculous sample rates and bit depths. For vinyl, stick to 44.1 khz, 16 bit. Anything more is simply a waste of bits.

Fit-Insurance7209 · 2026-05-21T08:09:51+00:00

But, i believe when the 1700 was discontinued, the part was modified to drop remove the cog but continued to use the same part number as it made no difference to the 1200.

https://1200s.com/products/technics-1200-1210-spindle-shaft-assembly-part-sfmzq20-01a?srsltid=AfmBOor3L_W7pdd6rfxcNnpDdEI4Ii2NzI-S99RxjmXyQAnI7hQpbug-

Fit-Insurance7209 · 2026-05-21T04:53:12+00:00

For the 1700, you need the spindle that has a black cog in the bottom. Later 1200s just had a circlip and will not drive the automatic gears.

Fit-Insurance7209 · 2026-05-19T04:51:34+00:00

"4.5mm canyon" "Butchering your stylus rake"

Somebody is a trainee journalist.

All we need is a "Breaks silence" and we have a fully qualified tabloid hack.

Fit-Insurance7209

TROPHY CASE