11-25-2022, 10:04 AM
Hi and welcome,
On the 025 Circuit Tester there's a slim chance that it's a battery powered vtvm. In that case it would be 1megohm. The reason I mention it is that it has an off position on one of the controls. If it isn't a vtvm it's probably 1k per volt. I couldn't find a diagram of it. There's ad in the 1936 parts catalogue pg 24 near the bottom. If you have a burning desire to acquire one there's one on epay.
A good decently calibrated vtvm is handy tool to have on your service bench. It's great for aiding in alignments and won't load down control grid voltages when measuring like vom will. In general if the measured voltage is within about 20% with a modern device it's a good starting point nowdays. Vacuum tube circuits are a lot more forgiving than solid state devices. 1/2 or 1 volt on the base or emitter of a transistor can make the difference between it being turn on and working or off and dead.
On the 025 Circuit Tester there's a slim chance that it's a battery powered vtvm. In that case it would be 1megohm. The reason I mention it is that it has an off position on one of the controls. If it isn't a vtvm it's probably 1k per volt. I couldn't find a diagram of it. There's ad in the 1936 parts catalogue pg 24 near the bottom. If you have a burning desire to acquire one there's one on epay.
A good decently calibrated vtvm is handy tool to have on your service bench. It's great for aiding in alignments and won't load down control grid voltages when measuring like vom will. In general if the measured voltage is within about 20% with a modern device it's a good starting point nowdays. Vacuum tube circuits are a lot more forgiving than solid state devices. 1/2 or 1 volt on the base or emitter of a transistor can make the difference between it being turn on and working or off and dead.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
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