Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x

Thread Closed

Philco 38-10
#16

The drama surrounding the 2nd detector and the IF signal is finally solved ! Today my parts arrived from Dave Cantelon at Just Radios. Among therm were 100 pf and 110 pf condensers. I installed the missing 100 pf condensers in the 2nd IF can...
[Image: https://64.media.tumblr.com/5ec1fe785df6...040f0f.jpg]

I had also tested the IF (6K7G) and 2nd detector (6Q7G) tubes before this, and found that the 6Q7G I was using had gone bad. It lit up OK, but it was completely dead under test ! How it managed to pass the audio signal I don't know, or much care. I believe this was the main source of my frustration. I didn't bother to even try the radio again until after I had received and installed the 100 pf condensers. Once that was done, I set about seeing if I could finally re-align the radio. As soon as I turned it on, with my signal generator set for 470KC I was able to hear a signal when I injected the signal through a .01 MFD condenser into the grid of the IF amp.I tuned and peaked the 2nd IF transformer, then moved the input to the grid of the first detector (6A8G), and tuned and peaked the 1st IF transformer. With that done, I moved the signal input to the antenna input , and, following the alignment instructions, peaked things up finally. After that I proceeded with the rest of the alignment as the instructions describe, and everything went pretty smoothly. Tonight I will do final tweaks, and then test the radio on my outdoor antenna.


Messages In This Thread
Philco 38-10 - by mikethedruid - 03-21-2021, 10:16 PM
RE: Philco 38-10 - by mikethedruid - 03-22-2021, 05:29 PM
RE: Philco 38-10 - by David - 03-22-2021, 08:51 PM
RE: Philco 38-10 - by mikethedruid - 03-22-2021, 09:58 PM
RE: Philco 38-10 - by mikethedruid - 03-23-2021, 08:35 PM
RE: Philco 38-10 - by Ron Ramirez - 03-23-2021, 10:05 PM
RE: Philco 38-10 - by mikethedruid - 03-24-2021, 12:00 PM
RE: Philco 38-10 - by mikethedruid - 03-25-2021, 02:58 PM
RE: Philco 38-10 - by mikethedruid - 03-25-2021, 09:48 PM
RE: Philco 38-10 - by mikethedruid - 03-26-2021, 01:59 AM
RE: Philco 38-10 - by RodB - 03-26-2021, 09:32 AM
RE: Philco 38-10 - by mikethedruid - 03-26-2021, 03:00 PM
RE: Philco 38-10 - by mikethedruid - 03-27-2021, 08:57 PM
RE: Philco 38-10 - by mikethedruid - 03-29-2021, 07:11 PM
RE: Philco 38-10 - by mikethedruid - 03-30-2021, 07:40 PM
RE: Philco 38-10 - by mikethedruid - 04-05-2021, 03:03 PM
RE: Philco 38-10 - by mikethedruid - 04-05-2021, 09:27 PM
RE: Philco 38-10 - by radiorich - 10-25-2021, 06:22 PM
RE: Philco 38-10 - by Brad Winder - 10-31-2021, 01:38 PM
RE: Philco 38-10 - by David - 10-31-2021, 04:33 PM



Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
Philco P45-6365 Universal Transformer Instruction Manual
Can anyone guide me to where this may be found?GRG — 03:00 PM
54C Complete Teardown/Rebuild
I don't think that I have encountered a 12Z3 before, curious how it uses one of those but includes a #43, which is a 25 ...Arran — 02:17 PM
HiFi (Chifi) tube amp build - but my own design.
It's the other forum. I'm also in DIY, but mostly read there. Honestly, I kinda jumped into this without much thought to...TV MAN — 10:43 AM
Philco 71 Code 125
Hello,  I am in need of a schematic for this radio. Mine has the three separate circular tube shields and a shadow me...dconant — 08:06 AM
Stromberg Carlson 1500 Squeal
And life just keeps getting more complicated.dconant — 07:57 AM
54C Complete Teardown/Rebuild
Hello Roy, here is this one sincerely Richardradiorich — 12:45 AM
54C Complete Teardown/Rebuild
Richard, Had grabbed it already but thank you just the same.  I find myself wanting to find some way to block out the...glyphmon — 12:03 AM
54C Complete Teardown/Rebuild
Hello roy, here is a link to the schematic . Sincerely Richardradiorich — 11:54 PM
54C Complete Teardown/Rebuild
Richard, The Silvertone 2014 also is a transformerless set, so I am incorporating a 1:1 600 ohm audio isolation transfo...glyphmon — 11:37 PM
Preliminary work on wife's Silvertone 2014
Did an alignment today which was interesting.  IF alignment went great, almost all was already spot-on.  Adjusting on th...glyphmon — 11:35 PM

[-]
Who's Online
There are currently 2316 online users. [Complete List]
» 1 Member(s) | 2315 Guest(s)
Avatar

>