Admiral Telebar help

[David Roper]

With power applied, what color is the 6BQ6 plate, black or red...?

[Radiotronman]

I guess I need to test my nos flyback or what is causing no hv?

[timmy]

You said it did the same thing with the old fly then you changed it so there is no sense in checking the new fly.

[Radiotronman]

The plates on the 6BQ6 are black. What's going on here?

[Electronic M]

How is the damper doing?

[Eric H]

Originally Posted by Radiotronman

The plates on the 6BQ6 are black. What's going on here?

The plate in the tube can glow red if the Oscillator isn't running.

The squealing noise would seem to indicate that it is though, if it's loud then it's probably not at the right frequency.

If you pull the connector off the top of the 6BQ6 tube does the noise stop?

[Kevin Kuehn]

Originally Posted by Radiotronman

I replaced a few micas around the horizontal output tube and a couple resistors, but no improvement. Pin two on the horz output tube is supposed to be 305v, and I measure 250v. The mica cap on the horizontal lock coil is a 3900pf mica, which I don't have. Any more ideas?

Which Sams are you using?

[Kevin Kuehn]

More specifically which chassis number do you have? The Sams website lists two different folders for that model number and the Horz circuits are not the same.

[dieseljeep]

Originally Posted by Electronic M

If the usual caps, resistors, tubes bit don't get it working then the horizontal section may need adjusting. IIRC admiral subscribed to the same synchroguide H osc system RCA did, so it should require the same kind of setup....Get the waveform peak just a bit higher than the hump and make sure peaks are as far apart as the H sync pulses.

That chassis doesn't use syncroguide! Many models did, but not that one.
I don't remember what they called that circuit. I always seemed to have grief with that circuit. Synchroguide seemed to be a little easier to troubleshoot.

[Kevin Kuehn]

Sams lists Admiral model 321k47 in both 117-2 and 135-2. The circuit in 117-2 really does look like RCA's Syncroguide, no?

[Radiotronman]

So, any ideas on why there is no hv?

[bandersen]

Sure looks like Syncroguide to me.

Here are a few possibilities.
Flyback is bad or hooked up wrong - Check your wring and check the resistance between flyback windings. Should be close to values shown on scheamtic

Horizontal oscillator running way off frequency. Check waveform on pin 5 if you have a scope.
Weak drive signal to 6BQ6 - Does adjusting the horizontal drive do anything ? Check DC voltages on 6BQ6 too.

[Radiotronman]

Bob,

Adjusting the horizontal drive doesn't do anything.

[dieseljeep]

Originally Posted by bandersen

Sure looks like Syncroguide to me.

Here are a few possibilities.
Flyback is bad or hooked up wrong - Check your wring and check the resistance between flyback windings. Should be close to values shown on scheamtic

Horizontal oscillator running way off frequency. Check waveform on pin 5 if you have a scope.
Weak drive signal to 6BQ6 - Does adjusting the horizontal drive do anything ? Check DC voltages on 6BQ6 too.

The schematic must be the Syncroguide version, not the set the OP is working on!
The OP is referring to the .0039 cap across the horizontal lock coil.
The chassis should have a horiz phase det tube like a 6AL5.

[dieseljeep]

Originally Posted by Kevin Kuehn

More specifically which chassis number do you have? The Sams website lists two different folders for that model number and the Horz circuits are not the same.

Riders shows that model number to use a 21B1 or a 21L1 chassis.
The schematic shown is not the right one.
The OP should only use the chassis number. Model numbers mean very little.
Riders volume # 13, page 13-1. There was a multitude of changes made throughout the production run.