07-05-2013, 01:40 PM
JohnR and Mondial,
I reinstalled the IF x-former - tried a .047 bypass everywhere - no joy. Unfortunately I have no way to test capacitance. And I dont have a 3000pF around. But yeah, replacing it would eliminate it. I see the Tube-Store has them - I will order ...and wait. Hate that. Meanwhile I would also note B+ is running 104VDC (schematic says 83V) and about 2vac ripple - PS seems normal except it now has new 22 mf filters instead of 20 mf. And I have a modern meter with way more than 20,000 ohms/volt like they used back then. Dont know why B+ is high. Also got plenty of volume. Have run the IF alignment a dozen times and it seems to work alright - each stage peaks OK - except the slug on the 1st IF seems to have a very broad peak if you can call it that. When tuning now, anywhere near a station I get whistling - anywhere else on the band I get a 60hz buzz/feedback.
I reinstalled the IF x-former - tried a .047 bypass everywhere - no joy. Unfortunately I have no way to test capacitance. And I dont have a 3000pF around. But yeah, replacing it would eliminate it. I see the Tube-Store has them - I will order ...and wait. Hate that. Meanwhile I would also note B+ is running 104VDC (schematic says 83V) and about 2vac ripple - PS seems normal except it now has new 22 mf filters instead of 20 mf. And I have a modern meter with way more than 20,000 ohms/volt like they used back then. Dont know why B+ is high. Also got plenty of volume. Have run the IF alignment a dozen times and it seems to work alright - each stage peaks OK - except the slug on the 1st IF seems to have a very broad peak if you can call it that. When tuning now, anywhere near a station I get whistling - anywhere else on the band I get a 60hz buzz/feedback.
