1950s or '60s vintage Zenith TVs, Need some info

[Kevin Kuehn]

I suppose you've already measured the DC voltages on the pins of the Audio output tube, and verified they are close to what Sams calls out.

[Kevin Kuehn]

Originally Posted by Kevin Kuehn

I suppose you've already measured the DC voltages on the pins of the Audio output tube, and verified they are close to what Sams calls out.

FWIW when you do the above you'll need to have the output transformer connected in the circuit. In case you haven't figured it out, the Sams for your Bug eye model Y1814YU is in Sams 333 folder 17.

Link to the center section of the schematic, where the audio output is at the top right.
https://live.staticflickr.com/65535/...ce52b32e_k.jpg

Link to right Page of schematic.
https://live.staticflickr.com/65535/...660e33e3_k.jpg

Link to left page of schematic.
https://live.staticflickr.com/65535/...16ea5667_k.jpg

[vortalexfan]

Originally Posted by Kevin Kuehn

FWIW when you do the above you'll need to have the output transformer connected in the circuit. In case you haven't figured it out, the Sams for your Bug eye model Y1814YU is in Sams 333 folder 17.

Link to the center section of the schematic, where the audio output is at the top right.
https://live.staticflickr.com/65535/...ce52b32e_k.jpg

Link to right Page of schematic.
https://live.staticflickr.com/65535/...660e33e3_k.jpg

Link to left page of schematic.
https://live.staticflickr.com/65535/...16ea5667_k.jpg

I've already got a physical copy of the Sam's for this TV, as for measuring the voltages at the Output tube pins no, I haven't done that yet, I will do that now.

I have a signal generator but not an audio generator, would a signal generator work the same way?

[Kevin Kuehn]

Originally Posted by vortalexfan

I have a signal generator but not an audio generator, would a signal generator work the same way?

Don't get hung up on the name. Take a look at the frequency ranges covered. If you can dial it down to an audible frequency you should be good. Typically 400-1k hz are used when chasing an audio signal through a circuit, but in theory any frequency the circuit can pass could be used, within your hearing range of course, unless your looking with scope.

[vortalexfan]

Originally Posted by Kevin Kuehn

Don't get hung up on the name. Take a look at the frequency ranges covered. If you can dial it down to an audible frequency you should be good. Typically 400-1k hz are used when chasing an audio signal through a circuit, but in theory any frequency the circuit can pass could be used, within your hearing range of course, unless your looking with scope.

OK, thanks.