1950 Philharmonic 8200 Audio Issues

[maxhifi]

Not sure what is causing the issue, but to make it not happen again, put some heat shrink on the end of your screwdriver, leaving just enough blade exposed to fit the screw you are adjusting.

[vortalexfan]

Originally Posted by maxhifi

Not sure what is causing the issue, but to make it not happen again, put some heat shrink on the end of your screwdriver, leaving just enough blade exposed to fit the screw you are adjusting.

OK, I'll try that.

Could I temporarily use a 19T8 in this TV in place of the 6T8 for testing purposes?

I'm asking because I have a whole buttload of 19T8 tubes and no working 6T8 tubes currently.

I was thinking that I had heard (at least in series string sets anyways) that you could go slightly higher than the original rated tubes for testing purposes (e.g. 12BA6 in place of a 6BA6, and it wouldn't really harm the circuit).

[maxhifi]

Originally Posted by vortalexfan

OK, I'll try that.

Could I temporarily use a 19T8 in this TV in place of the 6T8 for testing purposes?

I'm asking because I have a whole buttload of 19T8 tubes and no working 6T8 tubes currently.

I was thinking that I had heard (at least in series string sets anyways) that you could go slightly higher than the original rated tubes for testing purposes (e.g. 12BA6 in place of a 6BA6, and it wouldn't really harm the circuit).

I would say no to that substitution, it will push too much current though the 19T8, it is too far off.

[vortalexfan]

Originally Posted by maxhifi

I would say no to that substitution, it will push too much current though the 19T8, it is too far off.

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

[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.