Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

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: 14 Guest(s)
[-]
Recent Posts
Help identifying
Welcome to the Phorum! With the cabinet being custom it makes it harder to be certain about the radio and phono model...klondike98 — 09:11 PM
Using a loop on a long wire 60B
There's also many DIY loop antenna options on YouTube your son may want to check out. Some are quite decorative and can ...RodB — 03:36 PM
Using a loop on a long wire 60B
It could be hit or miss getting a salvaged loop to resonate for the desired station and it will require some sort packag...Chas — 02:50 PM
Using a loop on a long wire 60B
I searched but couldn't find an exact answer.  I'm giving my son my 60B that I electrically restored some 8 years ago (I...JohnCT — 12:49 PM
38-10T chassis Restoration begins
Hello Mr Fixr, years ago I had to wash two vcrs one was used by the school disctrict and the other was a family who had...radiorich — 10:53 AM
38-10T chassis Restoration begins
My dad's manager took the NRI course many years ago and gave me his course booklets. One of the course lessons was on r...MrFixr55 — 10:20 AM
Philco 38-2 Low Volume
I have done the RF and magnetic tuning alignment. The magnetic tuning really does its job quite well. Had to do three tr...dconant — 08:41 AM
38-10T chassis Restoration begins
Hello Dan, Very cool !! morzh , I have seen people put computers and other items in the dish washer ! Sincerely Ri...radiorich — 11:26 PM
38-10T chassis Restoration begins
Arran I also washed tuning caps in dishwasher and in soap water without having removed the micas. Upon drying, it wa...morzh — 02:00 PM
38-10T chassis Restoration begins
Hi Richard, I used to build houses and we used a lot of those gold flake counter tops. We even used gold flake ceramic t...dconant — 11:11 AM

[-]
Who's Online
There are currently 4400 online users. [Complete List]
» 1 Member(s) | 4399 Guest(s)
Avatar

>