Audio Asylum Thread Printer
Get a view of an entire thread on one page
|For Sale Ads|
I just bought this wild looking "thing" at a garage sale. I guess it is some kind of vacuum tube. It has ITT F-7207-A on it. I can find not a thing about it.
Does anyone know what it is, what's it used for, does it have any value?
What's the best way to clean it, particularly the bolts and connectors.
I just found something similar and description says AM broadcasting up to 30 megacycles and 10.5kVdc plate voltage and 30kW plate input. It has maximum output of 40kW.
Not much use unless you find the rest of the cow.
There is a tube rebuilder in the Northeast (forget name- Con...something I think). Look up tube rebuilders. They may buy it as a rebuildable core, not likely to buy as new though.
Looks to be a high-power (duh!) transmitting tube. Cooling fins indicate it was meant to be installed in a forced-air apparatus.
The radiators are found on a variety of massive tubes. I have seen some I think that were encased entirely by glass and could have been water cooled for all I know. I agree that this one looks like it is air cooled. I wonder if any of these mammoth tubes could ever been adopted as amplifiers in a circuit for audio. The output wattage would be insane and I guess the dedicated power supplies would take up a small room. I don't know but it appears they are very high power devices. How many watts radio stations claim??
I could not find any data on this tibe, but it looks to be about the same size as a 4CX20000, which is a more modern ceramic transmitting tube.
It's a big tetrode with 20kW plate dissipation, needs 140Amps heater current and 10kV B+.
I have known Hams who experimented with them. They used a "pole pig" power distribution transformer in reverse for the HV supply. 140A heater current needs a big filament transformer, too.
Post a Followup:
Post a Message!
This post is made possible by the generous support of people like you and our sponsors: