01-02-2020, 06:42 PM
I posted on another forum and got a lot of reading traffic but no responses so I thought I would ask here as well. If I get an answer here I'll copy it to the other forum.
I have finished the electrical restoration...I think... I noticed that in the BC band I get a high pitched whine/squeal from about 1100 KC down to 55 with no station reception. The whine disappears above 1100 and I pick up stations. I did not notice this on any SW band. Not sure if I need to check anything else before doing the alignment?
I have the instructions from Philco and Riders and I have a few questions. I have only done 1 alignment it was a year ago and don't remember how.
First:
1. Sig Gen set to 460KC modulated with 400hz, dial at 55, select BC range,turn down 2nd IF trimmer no. 54
2. connect sig gen without coupling cap to the grid of of the first IF tube with the grid cap wire removed.
3. I am suppose to connect the meter to the plates of the output tubes. I believe that to be pin 2 of the 42 tubes. Probe and ground on opposing tubes pin 2 with the meter set to AC and on the 0-30v scale
correct?
Second:
1. Connect Sig gen to the Antenna (replace grid cap wire on 1st IF) varying the freq and band switch as instructed, turn down wave trap trimmer no 1
The Riders has a note when moving the sig gen for this to use a 200 mmF condenser dummy antenna for BC and 400 ohm resistor for all SW. Is this saying put a 200mmf cap between the anntena jack and the sig gen when aligning BC steps and a 400 ohm resistor when aligning sw?
2. There is no mention of out meter placement being moved so I presume it stays as above?
Thanks,
Andy
I have finished the electrical restoration...I think... I noticed that in the BC band I get a high pitched whine/squeal from about 1100 KC down to 55 with no station reception. The whine disappears above 1100 and I pick up stations. I did not notice this on any SW band. Not sure if I need to check anything else before doing the alignment?
I have the instructions from Philco and Riders and I have a few questions. I have only done 1 alignment it was a year ago and don't remember how.
First:
1. Sig Gen set to 460KC modulated with 400hz, dial at 55, select BC range,turn down 2nd IF trimmer no. 54
2. connect sig gen without coupling cap to the grid of of the first IF tube with the grid cap wire removed.
3. I am suppose to connect the meter to the plates of the output tubes. I believe that to be pin 2 of the 42 tubes. Probe and ground on opposing tubes pin 2 with the meter set to AC and on the 0-30v scale
correct?
Second:
1. Connect Sig gen to the Antenna (replace grid cap wire on 1st IF) varying the freq and band switch as instructed, turn down wave trap trimmer no 1
The Riders has a note when moving the sig gen for this to use a 200 mmF condenser dummy antenna for BC and 400 ohm resistor for all SW. Is this saying put a 200mmf cap between the anntena jack and the sig gen when aligning BC steps and a 400 ohm resistor when aligning sw?
2. There is no mention of out meter placement being moved so I presume it stays as above?
Thanks,
Andy
