1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration

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

Linear Mode
Philco model 77
Radioroslyn
Phorum Expert
*****
Posts: 7,294
Threads: 268
Joined: Dec 2009
City: Roslyn Pa
#11

09-18-2016, 02:52 PM
After doing a little looking around methinks your opt is bad. Should be about 550 ohms end to end not 3.1K. That's why there is such an imbalance between the plate voltage on the 45 tubes. I can't seem to locate a pin out for the spkr plug but the combination of any two pin should yield a resistance of 3.4K (field coil), or 275 ohms (ct to plate), or 550 ohms (end to end of the opt), or 3.9K (fc+1/2 of opt primary). Unplug spkr when measuring.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry
Find
« Next Oldest | Next Newest »
Thread Closed


Messages In This Thread
Philco model 77 - by flatheadjr - 09-14-2016, 10:24 PM
RE: Philco model 77 - by flatheadjr - 09-14-2016, 10:25 PM
RE: Philco model 77 - by Arran - 09-16-2016, 03:17 AM
RE: Philco model 77 - by flatheadjr - 09-16-2016, 09:52 PM
RE: Philco model 77 - by Arran - 09-17-2016, 03:50 AM
RE: Philco model 77 - by flatheadjr - 09-17-2016, 08:25 PM
RE: Philco model 77 - by Radioroslyn - 09-17-2016, 09:21 PM
RE: Philco model 77 - by flatheadjr - 09-17-2016, 09:38 PM
RE: Philco model 77 - by Radioroslyn - 09-18-2016, 12:08 AM
RE: Philco model 77 - by flatheadjr - 09-18-2016, 12:47 AM
RE: Philco model 77 - by Radioroslyn - 09-18-2016, 02:52 PM
RE: Philco model 77 - by flatheadjr - 09-18-2016, 04:12 PM
RE: Philco model 77 - by Radioroslyn - 09-18-2016, 04:46 PM
RE: Philco model 77 - by flatheadjr - 09-18-2016, 06:11 PM
RE: Philco model 77 - by Radioroslyn - 09-18-2016, 07:37 PM
RE: Philco model 77 - by flatheadjr - 09-18-2016, 08:56 PM
RE: Philco model 77 - by Radioroslyn - 09-18-2016, 11:56 PM
RE: Philco model 77 - by flatheadjr - 09-19-2016, 12:20 PM
RE: Philco model 77 - by Radioroslyn - 09-19-2016, 01:09 PM
RE: Philco model 77 - by klondike98 - 09-19-2016, 03:01 PM
RE: Philco model 77 - by flatheadjr - 09-20-2016, 09:52 AM
RE: Philco model 77 - by flatheadjr - 09-20-2016, 11:25 PM
RE: Philco model 77 - by flatheadjr - 01-11-2017, 09:14 PM
RE: Philco model 77 - by Ron Ramirez - 01-11-2017, 09:55 PM



Users browsing this thread: 3 Guest(s)
[-]
Recent Posts
Philco 91 Restore Code ??
Can someone tell me if my 42 tubes are connected triode or pentode in fixed or cathode bias? How could I tell by looking...dconant — 10:47 AM
Philco 40-120C Restoration
Hello David, that is great news about the tubes source being local ! Sounds like you got good start on the radio . ...radiorich — 09:41 AM
An attempt to remove the Field Coil from a G speaker
Mike; I've only run into a speaker with an open filed coil twice, and they were on newer speakers from the 1940s. One ...Arran — 12:48 AM
An attempt to remove the Field Coil from a G speaker
Arran Yes, this is my plan for now and what do I got to lose, this is not even the speaker from this radio, but one o...morzh — 10:44 PM
An attempt to remove the Field Coil from a G speaker
Mike;  I would unwrap the field coil, and see if maybe there a break near one of the ends, like where the coil wire att...Arran — 10:23 PM
An attempt to remove the Field Coil from a G speaker
...and this is what I did. I fed a little LT into the screwholes with a small brush, and a little on the rim next to the...morzh — 09:52 PM
Philco 40-120C Restoration
I combined the two 40-120C threads together as we like to keep the discussion of the same radio together. It helps with...klondike98 — 09:36 PM
Philco 40-120C Weak, Distorted Ouput
Just checked were I buy tubes price is four dollars. So living in Florid we have a local source for tubes. David    David — 09:14 PM
Philco 40-120C Weak, Distorted Ouput
The higher voltage may be due to higher mains voltage. My mains run 120-125AC when the set was new mains would be 110-11...David — 09:09 PM
Philco 40-120C Weak, Distorted Ouput
Thank you for your reply. I pulled a speaker from a Philco 41-221 and received the same result. I used a signal tracer t...bluecap — 08:45 PM

[-]
Who's Online
There are currently 3628 online users. [Complete List]
» 2 Member(s) | 3626 Guest(s)
AvatarAvatar

>
  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration