1950 Philharmonic 8200 Audio Issues

[maxhifi]

Originally Posted by vortalexfan

OK, well then It looks like I'm gonna have to order some new 6T8s then.
Hopefully they aren't too expensive...

The only really expensive tubes I've encountered in this hobby, are the horizontal output tubes for color sets.

[AlanInSitges]

Originally Posted by maxhifi

The only really expensive tubes I've encountered in this hobby, are the horizontal output tubes for color sets.

...and anything ever used as an audio amplifier or output in any device, ever.

Edit: maybe not 50C5s.

[KentTeffeteller]

Originally Posted by maxhifi

The only really expensive tubes I've encountered in this hobby, are the horizontal output tubes for color sets.

Especially if those horizontal output tubes are popularly used in Ham Radio transmitters, tube type CB Radios, and illegal tube type CB Radio not so linear Amplifiers, aka Splatter Boxes aka multiple Spread Spectrum devices. And also popular audiophile tube types in desirable vintage NOS. Fixed that for you!

[old_coot88]

Horz output tubes in legal CB radios? I've seen small-signal types* like 12BY7 for finals in legal rigs. OTOH, bootleg linears used a lotta horz output types like 6KD6, 6JS6 etc.

* "small signal" compared to power output types.

[vortalexfan]

Originally Posted by old_coot88

Horz output tubes in legal CB radios? I've seen small-signal types* like 12BY7 for finals in legal rigs. OTOH, bootleg linears used a lotta horz output types like 6KD6, 6JS6 etc.

* "small signal" compared to power output types.

I've got some 12BY7s in my tube stash that I don't have any use for, should I try throwing them on fleabay and seeing if I can make some money off them?!

[vortalexfan]

Well I got some new 6T8 tubes and installed one of them into this TV and I got the audio to work just long enough for me to get the Video IF adjustments adjusted to where they should be so then I shut the TV off thinking the Audio issue was fixed, but then when I went to turn the TV back on again later on in the evening to make sure it was still working correctly and the audio was gone again and this time I didn't do anything to it to cause the audio to go away, it disappeared on its own this time, and I tried everything I could think of to try and get the audio to come back including swapping in another 6T8 tube and it wouldn't come back.

And I'm not sure what's going on with the audio on this TV as it was working fine until just recently.

[KentTeffeteller]

Originally Posted by vortalexfan

I've got some 12BY7s in my tube stash that I don't have any use for, should I try throwing them on fleabay and seeing if I can make some money off them?!

The horizontal output tubes for some years were popular for illegal CB Radio not so linear amplifiers, and for many amateur radio HF transceivers as well, the Yaesu FT 101 line, the Swan 350 as two well known examples. They were cheaper in this era than Eimac 3-500z or other RF tubes when these transceivers were new, or not very old.

[Electronic M]

Originally Posted by KentTeffeteller

The horizontal output tubes for some years were popular for illegal CB Radio not so linear amplifiers, and for many amateur radio HF transceivers as well, the Yaesu FT 101 line, the Swan 350 as two well known examples. They were cheaper in this era than Eimac 3-500z or other RF tubes when these transceivers were new, or not very old.

The 12BY7 was more of a video output. They haven't obtained the value that 6LB6 tubes and the like have.