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

Thread Closed

Zenith 5R312 voltages
#7

Howdy:
I switched to a VTVM. Voltages did drop a bit.
I also found 2 resistors that connect to the eletrolytics to be off. Now im reading about 20/25 volts over what the schematic says on the b+. AC rectifer voltage still about 50v over whats listed. Filament voltage is 6.7 instead of 6.2. Radio plays nice, ran over 6 hours, nothing got too warm . I did notice the speaker is a replacement. The schematic says the field coil is 2125 ohms. I'm reading 1080 ohms on the replacement. Maybe that effects the voltage as well as higher line voltage.
Anyway, my AC power here is running 123V. I want to bring that down to 115V.
I saw on here that some use a voltage dropping resistor and others use a CL-80 Thermister.
I might get both and see what works best. I love to tinker on this thing.
To drop the 123 to 115 will require a 22 ohm resistor, according to a dropping resistor calaculator on line. I'm terrible at math.Icon_crazy
Will get a Vishay/Dale wirewound chassis mount.
Power is 45 Watts according to schematic, so @ 123V it suppose to draw .36A according to ohms law. What watttage resistor would work best. Calaculator program said 2.66W minimum...
Thanks
Buzz


Messages In This Thread
Zenith 5R312 voltages - by Buzz - 11-01-2013, 09:30 PM
RE: Zenith 5R312 voltages - by morzh - 11-01-2013, 10:38 PM
RE: Zenith 5R312 voltages - by Buzz - 11-01-2013, 10:42 PM
RE: Zenith 5R312 voltages - by BrendaAnnD - 11-01-2013, 10:48 PM
RE: Zenith 5R312 voltages - by Arran - 11-01-2013, 11:06 PM
RE: Zenith 5R312 voltages - by Mondial - 11-02-2013, 12:06 AM
RE: Zenith 5R312 voltages - by Buzz - 11-03-2013, 06:28 PM
RE: Zenith 5R312 voltages - by morzh - 11-03-2013, 10:44 PM
RE: Zenith 5R312 voltages - by Arran - 11-04-2013, 03:10 AM
RE: Zenith 5R312 voltages - by Buzz - 11-04-2013, 12:36 PM
RE: Zenith 5R312 voltages - by BrendaAnnD - 11-04-2013, 03:43 PM
RE: Zenith 5R312 voltages - by morzh - 11-04-2013, 08:52 PM
RE: Zenith 5R312 voltages - by Buzz - 11-04-2013, 09:58 PM
RE: Zenith 5R312 voltages - by Arran - 11-04-2013, 10:14 PM
RE: Zenith 5R312 voltages - by morzh - 11-04-2013, 10:22 PM
RE: Zenith 5R312 voltages - by Buzz - 11-08-2013, 10:43 PM
RE: Zenith 5R312 voltages - by Arran - 11-09-2013, 03:09 AM



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 1830 online users. [Complete List]
» 1 Member(s) | 1829 Guest(s)
Avatar

>