Scored an Admiral 19A11

[old_coot88]

Please don't mess with video alignment without first checking for plate and screen voltage on the IF tubes, and that their heaters are lit.

The set uses intercarrier sound. So you'd think that with a dead video IF stage, it'd kill the sound too. But since the sound carrier is FM, it could be going through by capacitive coupling.

[Crist Rigott]

Originally Posted by old_coot88

Please don't mess with video alignment without first checking for plate and screen voltage on the IF tubes, and that their heaters are lit.

The set uses intercarrier sound. So you'd think that with a dead video IF stage, it'd kill the sound too. But since the sound carrier is FM, it could be going through by capacitive coupling.

Fair enough. I'll check those voltages.

[Crist Rigott]

OK, here's what I measured. There was no signal to the antenna terminals.

Also the "mains" was only at 114VAC. Hence the low voltage on the heaters and B+ was only 237V. When the mains was brought up to house voltage of 124VAC, the heaters went up to 6vac and B+ went to 257V.

[jr_tech]

Got to get some plate voltage to pin 2 of the 6J6 for openers...perhaps the 15 k resistor in A4 is open?

jr

[Crist Rigott]

Originally Posted by jr_tech

Got to get some plate voltage to pin 2 of the 6J6 for openers...perhaps the 15 k resistor in A4 is open?

jr

Yeah, I agree. I checked that resistor. It ohmed out to 21K. I'll pull A4 and replace that resistor too.

I went through the tuner last night in great detail. No problems found except that resistor.
I have another tuner and I'll clip lead the tuner in and try it then swap tuners and try it again.
Then go on to an alignment.

[jr_tech]

If it has only increased to 21K, I doubt that the voltage would drop that much (75 to 8.2 volts)... is the 6J6 ok?

jr

[Crist Rigott]

Originally Posted by jr_tech

If it has only increased to 21K, I doubt that the voltage would drop that much (75 to 8.2 volts)... is the 6J6 ok?

jr

Yeah, I agree. I'll swap out the 6J6 next time.