🔴 Heathkit IT-12 Signal Tracer Refurbishment - No.1000

Heathkit IT-12 Signal Tracer Refurbishment
I give my old Heathkit IT-12 Signal Tracer a bit of going over and replace a few bits that need improving.
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[@TonyAlbus]

Congrats on you 1000 .. great job, thanks for the videos

[@TheDefpom]

Thanks Tony

[@ralphj4012]

The voltage on the probe tip when switched to noise is concerning (especially if you were to inadvertently inject that into a sensitive amplifier etc). Although the probe is capacitively coupled I believe you can override that capacitor with the switch on the probe, though I may be wrong.

[@hectorpascal]

Yep! Personally I would not put this Signal Tracer anywhere near the inside of ANY transistor equipment.

[@hectorpascal]

@6:17 50 milli-farad reservoir or smoothing capacitors in tube/valve equipment? As Dave Jones would say: "that's a trap for young players"... mfd written on capacitors is ancient US electronic-speak for MICRO-farad. 50 milli-farad is 5000uF!

[@entropyachieved750]

Nice old bit of kit...
Good vid

[@douro20]

I bought a Precision Grommes signal tracer recently. The only thing I wish it had was a "noise" mode. It has a 6AT6 tube in the probe, which I might change out for a 6AV6 later.

[@danishnative9555]

Fixed for the next 10 years of stasis. Good job Scott.

[@pcwrangler09]

Nice, I've always liked these little guys. For a modern and low cost alternative try the probe of a generator/tracer like the Fluke Networks Pro3000. It works great for tracing audio or noise through a circuit. You can also find generic versions for cheap. Of course it won't have the character of these Heathkit beauties!

[@johnfoley8828]

my IT-12 does not deflect the eye tube when I touch the probe tip. Any suggestions? But I can hear it on the speaker.

[@TheDefpom]

Nothing specific, probably just needs a full refurbishment if it hasn’t already had one.

[@alpcns]

Nice piece of gear, lovely tube stuff. I wouldn't trust that old electrolytic - they might short on you at the worst possible moment without warning.

[@TheDefpom]

Yeah I am not comfortable with that either, I might have to revisit the capacitors and do it properly.

[@HeyBirt]

The tolerance band on those resistors look silver which is 10% so they are fine: Gold, Silver, None = 5%, 10%, 20%
OK, never mind you got that a few minutes after my comment...