Admiral 14R12 Restoration

[Crist Rigott]

I checked those resistors and here are the pictures of each one installed. The first picture shows R18 a 10K and the second shows R19 a 4.7K.

I keep notes on each resistor removed and installed.

10K R18 was 9.81K and was replaced with a 9.8K
4.7K R19 was 4.92K and was replaced with a 4.64K

[Kevin Kuehn]

Can you verify that by adjusting the Ch 3 oscillator slug, that it will in fact alter your sound and picture tuning? There should be a definite point where both at their best. It's the same effect as adjusting the fine tuning control, only this should have a coarser range.

[Crist Rigott]

Originally Posted by Kevin Kuehn

Can you verify that by adjusting the Ch 3 oscillator slug, that it will in fact alter your sound and picture tuning? There should be a definite point where both at their best. It's the same effect as adjusting the fine tuning control, only this should have a coarser range.

Yes, it does exactly like you said.

[Crist Rigott]

I went over to channel 6 and my pattern generator and the video was unsettled. I tweaked the channel slug and got a great pattern. I only tweaked it just about a 1/4 turn or less.

[Kevin Kuehn]

Beings they're that close it's hard to imagine the IF is off as far as your marker generator is indicating. I suppose you could slowly tune your IF back in the direction of 24MC, intermittently checking if you can still get good sound and video by readjusting the Ch 3 oscillator coil. I don't know what else to suggest. Maybe Old Coot will have a suggestion.

[Crist Rigott]

OK. We'll see what he has to say.

[old_coot88]

I was gonna suggest essentially the same thing.. incrementally 'walking' the IF adjustments back, while looking for the best rendering of fine detail in the pic, with no ringing or smearing of fine detail. Probably have to re-tweak the Ch 3 osc slug along the way, to keep the fine tuning range centered.

There was a guy on here two or three years ago, a total newbie with a late 40s Dumont (I forget his name. Phil Nelson probably remembers). The guy did an IF alignment totally by eyeball, no instruments, no nothing. But damn if he didn't end up with a perfect pic, just as good as with a full instrument alignment. That might be the way to go with this one.

If you want to go the eyeball route and have a frequency counter that'll read 85.25 mc, set the Ch 3 osc slug to that frequency. (A turn or two of wire taped around the osc/mixer tube oughta provide a decent pick up.) With the fine tuning at mid range, the osc wants to be at 85.25 mc for a 24 mc IF. That way, you have a 'target' to walk the IF adjustments toward.

(Ch 3 carrier is 61.25 mc.)