Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

audio woes on the 38-5
#14

After 4 hours tiding up solder joints, changing a few resistors and micas in the area of the 6J5 I'm still no further ahead. No improvement. The set still howls and whistles and at full volume motorboats. I tried several different 6A8's with no improvement. I tried listening for the oscillator signal on a known good radio that’s nearby and that seemed to work. I was not able to get a strong station to come in very clear on the 38-5 but the one I was using was at 620 and I could hear the faint howling / whistling that was in the background at around 1100 on the dial on my freshly restored hippo I placed next to it on the workbench. When I turned off the 38-5, I could hear the whistling / howling go away on the hippo. So I think the OSC is working or trying to.

With my antenna wire clipped on to the grid of the 6K7, and my finger on the grid of the 6A8 tube, I can get that station AM 620 coming through loud and clear, sounding as it should. But that's the only station I can get. The local station (much stronger signal) on the upper end of the dial at 1470 doesn't come through with the same antenna / finger configuration.

Any thoughts on what to try next? I'm at a loss. I'm about ready to gator wire a new tube socket to the 6J5 and try that tube externally in a new socket to see if I'm not getting a good connection or have a damaged socket.

Greg V.
West Bend, WI
Member WARCI.org


Messages In This Thread
audio woes on the 38-5 - by NostalgiaRadioTime - 01-24-2018, 11:30 PM
RE: audio woes on the 38-5 - by morzh - 01-24-2018, 11:56 PM
RE: audio woes on the 38-5 - by Radioroslyn - 01-26-2018, 01:15 PM
RE: audio woes on the 38-5 - by morzh - 01-26-2018, 02:41 PM
RE: audio woes on the 38-5 - by Ron Ramirez - 01-27-2018, 12:12 AM
RE: audio woes on the 38-5 - by Radioroslyn - 01-27-2018, 12:49 AM
RE: audio woes on the 38-5 - by morzh - 01-28-2018, 10:53 AM
RE: audio woes on the 38-5 - by Steve Chambers - 01-28-2018, 11:14 AM
RE: audio woes on the 38-5 - by NostalgiaRadioTime - 01-28-2018, 07:39 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Zenith H725
David - I think I understand but what units are you discussing (Low of 1.7, high of 3.9)? Budget constraints for Ham ...EdHolland — 01:43 PM
My Philco 37-116 Restore
You're doing great. I wish I could be more involved, but my mind is right now preoccupied with the reason I am here in ...morzh — 12:21 PM
My Philco 37-116 Restore
Hope you guys are still with me. I have moved on to the alignment. I completed the IF alignment which was pretty muc...dconant — 10:47 AM
My Philco 37-116 Restore
Hello MrFixr55, Thank you for taking the time to explain. I measured 50 volts where you say. Today the 370 volts at ...dconant — 12:51 PM
462ron
Oh that sucks. It’s something easily overlooked. Hopefully it’s nothing more than a resistor! Ron462ron — 08:08 AM
Philco 46-480 Electronic Restoration
Just confirmed that you are correct. It’s the function generator. I connected the signal output probe to one of the inpu...jrblasde — 07:52 AM
Philco 46-480 Electronic Restoration
Ouch, you may be right. Yes, it is solid state. It’s the signal output of my oscilloscope. May be time to crack that ...jrblasde — 07:27 AM
462ron
If you didn’t put a DC blocking cap between the signal generator probe and the plate of the 1st IF it’s possible you ble...462ron — 07:07 AM
My Philco 37-116 Restore
Hi DConnant, The reason why C127 is isolated from ground is because sets of this vintage did not have the center tap...MrFixr55 — 01:07 AM
Philco 46-480 Electronic Restoration
The shield is on the 6H6. It was, in fact, a missing jumper to connect the main chassis ground to the RF chassis grou...jrblasde — 10:58 PM

[-]
Who's Online
There are currently 1040 online users. [Complete List]
» 2 Member(s) | 1038 Guest(s)
AvatarAvatar

>