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

Thread Closed

Unknown cathedral radio... HELP !
#31

Sounds like great news!  I'm sure it's lots of work flopping back and forth between two schematics, but nothing ventured, . . . Icon_biggrin
The 45K, 5 watt resistor seemed odd and purposeless as drawn in your schematic. Seems it should have been in series with those other two. Is that part of what was changed?
#32

It is now wired exactly like the Jackson-Bell Model 4 with all new parts except for the tube sockets, power transformer, the coils, the speaker assembly, and 2 gang variable condenser. I did add a .068 condenser across the 400 ohm resistor in the power supply to decouple some variation off the grid bias, although the difference is minimal with or without it. If you give it a while to warm up, at least 5 minutes, it picks up a number of stations now. The volume on many of them is not very high, but they are listenable. I think it's about the best I can hope for. I wonder if this was one of those ultra cheap sets radio dealers of the time, the Great Depression, had in their store so they could advertise them at a low price, then up-sell customers by showing them how much better their other, slightly more expensive sets performed. I remember reading something about this in the magazines in the links John (Eliot Ness) posted earlier in this thread. Very interesting reading there. I downloaded it all.
#33

Jake, the 45k is part of a voltage divider formed by it and the 20k 5w.

Steve

M R Radios   C M Tubes
#34

Yes, I recall  numerous remarks made about the those low-price leaders also. 
Glad you got it playing bud.  What's next on the agenda?   Icon_eek
#35

"Jake, the 45k is part of a voltage divider formed by it and the 20k 5w."

Thanks.

If I'm understanding correctly, they  create a current draw with more than one, stable voltage at different points along it?
#36

Yes, jake. They are used in a similar way to the candohm resistors in the Philco sets, which are tapped at various resistances to provide bias voltages to various grids in the circuit. It's the same principle, multiple resistances acting as a voltage divider.




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
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
54C Complete Teardown/Rebuild
The main problem with adding a Bluetooth input is that this set lacks a traditional power transformer to isolate it from...radiorich — 11:19 PM
54C Cabinet Refinish
I started stripping this cabinet before it got super chilly out because I knew I wasn't going to be able to work on ...glyphmon — 11:18 PM
54C Complete Teardown/Rebuild
While I'm waiting to wrap up the final steps on my wife's Silvertone 2014, I started disassembly on the next project.  O...glyphmon — 11:07 PM

[-]
Who's Online
There are currently 2740 online users. [Complete List]
» 2 Member(s) | 2738 Guest(s)
AvatarAvatar

>