Jürgen Haible Wasp CV Filter LM13700 version

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Wasp filter lm13700 16efec16d9b7

 Chris Stelloh have been playing around with Jürgen Haible Wasp CV Filter and sent me two verified layouts.. In hi sown words:  I had a chance to build up that LM13700 version of the Wasp Filter and found that using a much different value of potentiometer for the cutoff control made for a better filter … Read more

HICKOK: Model 800, Tube & Transistor Tester

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HICKOK Model 800 tube tester 1 714be7393aeb

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ROSE MUSIC: CSA. Model 35 PA Amplifier (Goldentone).

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CSA 35 PA head front 1 647c09adae61

This one’s a rare find – a Communication Systems of Australia valve PA head, ~35 watts from around 1967 / 68.  It’s super clean, fully functional, with all parts within spec. Anyone familiar with vintage Australian guitar amps will recognise the front panel straight away: it looks just like a Goldentone.  That’s no accident.  These … Read more

COLORSOUND: Treble Booster, Steve Williams (partial trace)

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Colorsound treble booster SW v1a 63b78e94114f

So there are a few bits missing, but if you are familiar with treble boosters, I’m sure you’ll work it out.  Being a small and simple circuit, it’s a good candidate for breadboarding. The filter pot is your standard input blend, probably similar to the values that Steve Williams uses in his Pigdog Competition Special … Read more