11-28-2016, 07:22 PM
So if any of you were wondering I really am a DA!
I was thinking that the avc action could be a little better so I went to the Rider's socket voltage layout to see if it has the voltage for the 75 tube diode (avc voltage). It didn't so I took a quick look at the service notes. Most of the time it's just resistor p# was changed to p# bah bah bah. Didn't have thing about the avc circuit but it did mention that the BC and POL oscillator trimmers are reversed on fig 2! Ahhhhhhhh! it was there all the time!!! I my defense some previous service man scratched into the top of the can 1500 above the wrong trimmer, I guess he could read either.
After hooking up a long ant to it I'm getting about -11v on the avc diode on a strong station. Seem pretty reasonable. Rewire the spkr cable (was cracked up pretty badly) and added some solder to the rivet that attaches the ant fastenstock clip, it was intermittent.
Yet to complete find replacement shadow meter and install it, tighten volume control, sort spkr ( loosened the surround and it sound much better) It has an old repair which is about 1" around but is very hard and has cause the cone to buckle a bit. May just cut it out and plug the hole with a coffee filter to relive the buckle. Needs a few rubber washer to mount the sound board and that should put the electronics to bed on this beast.
Valuable lesson learned!
I was thinking that the avc action could be a little better so I went to the Rider's socket voltage layout to see if it has the voltage for the 75 tube diode (avc voltage). It didn't so I took a quick look at the service notes. Most of the time it's just resistor p# was changed to p# bah bah bah. Didn't have thing about the avc circuit but it did mention that the BC and POL oscillator trimmers are reversed on fig 2! Ahhhhhhhh! it was there all the time!!! I my defense some previous service man scratched into the top of the can 1500 above the wrong trimmer, I guess he could read either.
After hooking up a long ant to it I'm getting about -11v on the avc diode on a strong station. Seem pretty reasonable. Rewire the spkr cable (was cracked up pretty badly) and added some solder to the rivet that attaches the ant fastenstock clip, it was intermittent.
Yet to complete find replacement shadow meter and install it, tighten volume control, sort spkr ( loosened the surround and it sound much better) It has an old repair which is about 1" around but is very hard and has cause the cone to buckle a bit. May just cut it out and plug the hole with a coffee filter to relive the buckle. Needs a few rubber washer to mount the sound board and that should put the electronics to bed on this beast.
Valuable lesson learned!
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got it!
Terry
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