04-20-2009, 09:14 PM
Hi all:
OK, I'm stumped! Have been working on a 47-1230 console, but the audio is low. Tested and replaced bad tubes, replaced filter caps w/ 33mfd 450v electrolytics (removed ALL trace of hum). Tested all paper caps for leakage - OK. Also tested speaker and choke coil - good. B+ is normal. It would seem as if all stages up 'til final audio (PP 6V6) are in good order - sound is clear up 'til 3/4 volume or so, then gets a little clipping distortion. The audio finals test just above 'OK', but hot hi-scale on my eico 666, near other known good 6v6s - same w/ 5Y3. Output xfrmr tests good per ohms in schematic. Thanks a million in advance for suggestions! Have a good one,
PS - I originally posted this in the section 'Philco home radio', having meant to post it here. Only took me 3 days to figure that out. I am, of course, an idiot!
OK, I'm stumped! Have been working on a 47-1230 console, but the audio is low. Tested and replaced bad tubes, replaced filter caps w/ 33mfd 450v electrolytics (removed ALL trace of hum). Tested all paper caps for leakage - OK. Also tested speaker and choke coil - good. B+ is normal. It would seem as if all stages up 'til final audio (PP 6V6) are in good order - sound is clear up 'til 3/4 volume or so, then gets a little clipping distortion. The audio finals test just above 'OK', but hot hi-scale on my eico 666, near other known good 6v6s - same w/ 5Y3. Output xfrmr tests good per ohms in schematic. Thanks a million in advance for suggestions! Have a good one,
PS - I originally posted this in the section 'Philco home radio', having meant to post it here. Only took me 3 days to figure that out. I am, of course, an idiot!
Until next time,
Stirling KC0NXM.
