02-21-2022, 01:37 PM
Hi Ralph,
Looked up a EICO 320 schematic. I see it's a tube model. Personally, all my test equipment is newer, transistor based as opposed to tube based. A little bit more reliable.
1st off, turn the output of the RF gen way way down, then feed the signal to the grid cap of the 6A7.
2nd, according to Rider's book on how to align Philco radios, if your RF Gen has a cap in line with the output of the generator you should place a 500 ohm across the output of the generator to provide DC bias to the tube.
Also, what kind of test equipment do you have? do you have an oscilloscope? a Frequency Counter? a high Z meter to monitor the audio output tone?
I was lucky when I recently restored my Run 7 Model 60, I had bought a second one off of ebay for parts, funny thing was it was in better shape than the unit I was planning to restore! LOL, so scrapped it cause the chassis and cabinet were shot. Those transformers in the metal cans have mica caps in them, both had open coils so I swapped them out and replaced the hidden mica caps. I am not sure if I wrote down what I measured on those coils, will have to look when I get home.
Looked up a EICO 320 schematic. I see it's a tube model. Personally, all my test equipment is newer, transistor based as opposed to tube based. A little bit more reliable.
1st off, turn the output of the RF gen way way down, then feed the signal to the grid cap of the 6A7.
2nd, according to Rider's book on how to align Philco radios, if your RF Gen has a cap in line with the output of the generator you should place a 500 ohm across the output of the generator to provide DC bias to the tube.
Also, what kind of test equipment do you have? do you have an oscilloscope? a Frequency Counter? a high Z meter to monitor the audio output tone?
I was lucky when I recently restored my Run 7 Model 60, I had bought a second one off of ebay for parts, funny thing was it was in better shape than the unit I was planning to restore! LOL, so scrapped it cause the chassis and cabinet were shot. Those transformers in the metal cans have mica caps in them, both had open coils so I swapped them out and replaced the hidden mica caps. I am not sure if I wrote down what I measured on those coils, will have to look when I get home.
