white/clear top = no vacuum. If there's no silver on the inside then it has lost its vacuum. That's how Lampie knows.
Last edited:
I would sell them AS IS. UNTESTED. You wont get much for them. Anyone interested would be able to see their condition in the photos.
It's a bit hard to see what you have here, but if the 5U4GB, RCA 6L6GC's and 6V6GTA's are in good condition, those should be worth something.
The small ones with clear tops could be broken, but could also have side getters. If there still is silver getter flash on the glass, they still have vacuum. Doesn't guarantee they work though.
Do you have a list?
The small ones with clear tops could be broken, but could also have side getters. If there still is silver getter flash on the glass, they still have vacuum. Doesn't guarantee they work though.
Do you have a list?
Those clear tops have side getters. I don't see anything wrong with these tubes. Common audio tubes. My experience with ex-organ tubes is generally positive, private owners usually didn't play their organs too much. Most likely they are like NOS, but of course can't tell without testing.
Yup. Side getters. Plenty of people like to pay extra for "clear tops"...
RCA made 12A*7 tubes like that and I see one tube at least that says 12AT7 so I'm guessing the tubes in the middle are all 12A*7
RCA made 12A*7 tubes like that and I see one tube at least that says 12AT7 so I'm guessing the tubes in the middle are all 12A*7
Last edited:
At the very least make sure the filament circuit has resistance. Selling tubes as is that are dead is borderline fraud. Don’t do that. Karma will get you when you buy one like that.
How can you tell that this organ was from 1944? Almost any tube you've been showing hadn't seen the market's light yet in that year. Ot what else does »44ish« mean?
Best regards!
Best regards!
Just apply heater voltage and test them with a diode tester.
You should get two diodes with a common cathode with a triode.
You should get two diodes with a common cathode with a triode.
- Home
- Amplifiers
- Tubes / Valves
- What to do with Organ Tube Find? 44ish Tubes (untested)