02-16-2019, 01:43 PM
Hi,
I an restoring a model 91 chassis #126 (purchased in 1975) and have run into a few problems. I replaced the capacitors and out of range resistors and am using a variac to limit the voltage to around 100V.
It powers up and the audio stages are fine. No stations are received.
Here are the problems so far.
1) The schematic shows the shadow box has a 1K (R14) resistor attached at one end to the shadow box and the other end to the screen grids of the 42 output tubes. I cannot not find any trace of R14.
2) The schematic also show C27 connected to one end R14 and then to ground. There is no trace of this capacitor. I have two model 91 schematics that show theses parts, so I am looking for a confirmation on this.
3) I am missing the front metal piece of the shadow box Anyone know where I can get one.
I have a feeling someone attempted repair and removed some components.
I would appreciate any information or advice.
Thank you
Bruce Ambuter KB1ORG
I an restoring a model 91 chassis #126 (purchased in 1975) and have run into a few problems. I replaced the capacitors and out of range resistors and am using a variac to limit the voltage to around 100V.
It powers up and the audio stages are fine. No stations are received.
Here are the problems so far.
1) The schematic shows the shadow box has a 1K (R14) resistor attached at one end to the shadow box and the other end to the screen grids of the 42 output tubes. I cannot not find any trace of R14.
2) The schematic also show C27 connected to one end R14 and then to ground. There is no trace of this capacitor. I have two model 91 schematics that show theses parts, so I am looking for a confirmation on this.
3) I am missing the front metal piece of the shadow box Anyone know where I can get one.
I have a feeling someone attempted repair and removed some components.
I would appreciate any information or advice.
Thank you
Bruce Ambuter KB1ORG
