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AUDIO FORUMS >> Replacement Tubes >> What are these tubes good for?
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Message started by Matthew on 02/15/18 at 06:12:04

Title: What are these tubes good for?
Post by Matthew on 02/15/18 at 06:12:04

:-?

I just gutted a ham radio labeled "Truck #" and a number I don't recall. I suppose it was part of a trucking companies equipment, and it was frequency specific in that the communication frequency could not be changed.

Anyway, I'll list all the tubes that were contained within. But I have some questions about tubes in general as well. I understand from Google searches that tubes with white or gray hues inside are typically failed tubes. The largest tube in this device has a spot on each side wherein some of the rods inside get very close to the glass, and the glass has large, black, discolored patches where those elements are. Is this a bad sign? Or just hot spots? Also, some of these tubes have that a dark, chrome hue in portions of the glass. Perhaps, this is the "gray" I am supposed to look for to signify the tube is bad? I'll try to post some pictures of them so you can make the judgement, but here's the list of tubes:

GE Compactron 7984 - The one with two large hot spot areas.
Amperex 6360 - a couple large, silvery-gray patches near the top of the tube (not to be confused with that chrome-looking cap tubes tend to have.
6BM6 - This doesn't have any names on it, and the last digit is tough to read, but appears to be a 6. Lots of silvery-gray patches around the glass.
Aerotron 6BN6
Aerotron 6DJ8
Aerotron 6CL8A
Aerotron 7060
Aerotron 12AX7A - Well, this one is pretty self-explanitory
Aerotron 6BH6

Note: I do my listening on headphones. May I use any of these to build a headphone amplifier? My headphones are 24-Ohm, with a power-handling of 1W.