Tube Testing & Repair Hints
Nowadays it isnīt easy to perform accurate, in the
meaning of time varying voltages, measurements, because in the lack of
suitable and affordable test gear. At the surplus markets you could get
lot of tube-testers, which means you apply a static voltages and then
read a plate current on an antique ammeter. Mostly the testers come
with an incredible amount and types of sockets you never need.
A year ago I had the opportunity to buy a modern Tek 577 Curve Tracer with the storage capability. I have only the adaptors for diodes and small-signal transistors. After recalibration the 577 shows very good results. I like especially the storage capablility so you can verifiy old “temperature compensated zeners”. (Please donīt think in this case at LTC burried-zener)