25-07-2020, 10:32 AM
Hi.
It's well known that valve testers don't simulate real life situations. Manufacturers would often say in manuals to substitute a new valve if there was doubt and of course for good reasons.
Even after selling on many valves recently I've kept all my battery valves, new and used. Over the years I've found huge variations between new ones especially the DK versions. Performance varies greatly especially those sets with short waves. A Zenith transoceananic I had used a very rare US F/C that would work after a fashion with a DK91 or 92, I can't remember what one but even the one that did work you had to try many before it worked best. In fact I later discovered a DK32 was the best valve, fortunately the chassis was already drilled for an octal, my set came with an adaptor plate and B7G base so was easily reversed.
It's well known that valve testers don't simulate real life situations. Manufacturers would often say in manuals to substitute a new valve if there was doubt and of course for good reasons.
Even after selling on many valves recently I've kept all my battery valves, new and used. Over the years I've found huge variations between new ones especially the DK versions. Performance varies greatly especially those sets with short waves. A Zenith transoceananic I had used a very rare US F/C that would work after a fashion with a DK91 or 92, I can't remember what one but even the one that did work you had to try many before it worked best. In fact I later discovered a DK32 was the best valve, fortunately the chassis was already drilled for an octal, my set came with an adaptor plate and B7G base so was easily reversed.
