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Old 9th May 2008, 1:37 am   #24
majoconz
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Join Date: Jan 2008
Location: Ashhurst, Manawatu, New Zealand
Posts: 570
Default Re: Test equipment for valve radio repair

IMHO it's not what you have for testing, it's being flexible and realising what you can do and what you can't do with what you've got! A simple diode detector can be added to an analogue multimeter for comparative RF measurements on an oscillator. You can make a simple 'Equivalent Series Resistance' checker for electrolytic C's. (http://ludens.cl/Electron/esr/esr.html) You can use a PLL HF receiver instead of a frequency counter. Make a signal tracer in a small box with an LM386, a PP9 and a small speaker, add the diode detector and you can follow the signal back up the IF strip. Add a couple of sockets across the speaker for your analogue voltmeter and you have a high impedance VTVM. You're only limited by your own ingenuity.

Good luck and best regards - Martin
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