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

42-321 model variations, schematic needed
#6

Yesterday, I took the 11" x17' scheamatic I had printed, and went through the chassis wire by wire, and component by component. I again confirmed that I had not made any error replacing almost all of the wires, the capacirtors, and several of the resistors. I resoldered a few connections, and cleaned or recleaned tube pins. I tested the 7A8, and replaced it with a better one I had in another radio (it was weak in the amplifier section, OK in the oscillator section). I set-up to align it, and set the IF cans, then found that it was still not oscillating, as grounding the oscillator section of the tuning gang capaciator did not make any difference. I then decided to parallel the oscillator coil from the parts radio with the one in it, and that showed that the original oscillator transformer was bad! I changed the transformer, and the radio worked OK. However, I was still not finished, as the original speaker had a bad buzz. I replaced it with the speaker from the parts set, and it sounds nice, and picks up many stations very well!

I don't know why the right side of the photos are cut off on this forum, but you can see the complete photos on my Photobucket account - FStephenMasek.

[Image: http://i269.photobucket.com/albums/jj77/...e006-5.jpg]

[Image: http://i269.photobucket.com/albums/jj77/...ure014.jpg]

[Image: http://i269.photobucket.com/albums/jj77/...e008-7.jpg]

[Image: http://i269.photobucket.com/albums/jj77/...e001-9.jpg]

[Image: http://i269.photobucket.com/albums/jj77/...ure002.jpg]


Messages In This Thread
Re: 42-321 model variations, schematic needed - by Guest - 10-30-2009, 04:47 PM
Re: 42-321 model variations, schematic needed - by FStephenMasek - 11-11-2009, 10:06 PM



Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
New member
Love the pic! I'm southern IL, so wouldn't be much help and Bob Anderson is very good on those, but lives in Chicago are...TV MAN — 05:25 PM
Philco 40-120C Filament Wiring
:thumbup:klondike98 — 04:56 PM
Philco 40-120C Filament Wiring
With these values I think you are OK; the Cmax for this tube is 40uF. Your Vbb could rise a bit, but probably not too mu...morzh — 04:53 PM
Philco 40-120C Filament Wiring
BTW, someone had replaced the original 20uF/20uF filter cap with a 47uF/33uF cap. Do you think these values are safe on ...bluecap — 04:33 PM
Philco 40-120C Filament Wiring
You're correct. I was misinterpreting the key position. I now know where it is, and things are making sense. I appreciat...bluecap — 04:29 PM
Philco 40-120C Filament Wiring
I think Morzh has a good thought. Check the key position. The under chassis diagram in the Philco info shows an “H” for ...klondike98 — 04:25 PM
Philco 630csx power cord
Yes, the third wire goes to the stud on the side and is separate from the other two. I've usually used cloth covered ...Tynwald — 03:09 PM
New member
Have you tried Alabama Historical Radio Society? They possibly could recommend someone. I remember a name of Dee Hanes...morzh — 03:08 PM
Philco 46-480 Electronic Restoration
Nope, he can’t tell me the dimensions. Looks like I won’t be buying it.jrblasde — 02:38 PM
Philco 46-480 Electronic Restoration
Hello Joseph , It sounds like you found a good seller and yes shipping is really expensive ! Sincerely Richardradiorich — 02:16 PM

[-]
Who's Online
There are currently 4049 online users. [Complete List]
» 1 Member(s) | 4048 Guest(s)
Avatar

>