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

37-116 different heater values
#1

While researching hi main volts and remedies,  i had tried putting 3,  10 watt, 30ohm  wire wound resistors in parallel in the line cord, I figured that my set uses 
1.15 amp   and trying to get a 10 volts drop i would use  about 11 watts...so i thought my approximately 3x safety factor was enough.

The resistors hit 300 degrees after 15 min... maybe within derated values but still.  Dang.  More research and i decided to try and make   a bucking transformer
out of a wall wart. It  brought my voltage to around 110 now.  Much less heat.

So to my problem, i have read using the heater voltage is a good guide of mains voltage to use.  I measured the 6j5g AVC tube originally and went from 7.0 to about 6.5 volts .  Much better until i started measuring random others and they are all about 5.8 volts now.  I put in a  nos  6j5g and the heater is the same  about .7
above the others.

Why is one higher than all the others?  I know there is a magnetic tuning transformer and maybe this is part of that, but the tubes around it the 6h6g and the 6k7g are also at the lower voltage.

Any ideas?

Thanks

Bill


Messages In This Thread
37-116 different heater values - by poulsbobill - 05-01-2022, 10:39 PM
RE: 37-116 different heater values - by Mondial - 05-01-2022, 11:56 PM
RE: 37-116 different heater values - by Mondial - 05-02-2022, 12:15 PM
RE: 37-116 different heater values - by Mondial - 05-02-2022, 02:25 PM
RE: 37-116 different heater values - by Mondial - 05-02-2022, 03:45 PM
RE: 37-116 different heater values - by morzh - 05-02-2022, 07:09 PM



Users browsing this thread: 3 Guest(s)
[-]
Recent Posts
IF can wire size and Rubber mounts?
Thanks to both members for your help regarding wire and tuner mtg supports. regards--Johngeorgetownjohn — 09:33 AM
Hickok AC51 tube tester
Note that no power cord, power switch, or power transformer switch are shown. That (along with my experience with full s...DaleHCook — 07:09 AM
IF can wire size and Rubber mounts?
A pair of wire strippers can give you an idea of what the existing gauge of the wire leads are in the IF can, I think it...Arran — 06:07 AM
My last cabinet for this year
Hello Dan, That is really beautiful what great looking radio you have ! I have friends who live in Calgary and the wea...radiorich — 01:51 AM
Philco Predicta Siesta picture over time getting dimmer
I found that the wire insulation was burnt.  The fly back needs corona dope! Why would someone put that there?Platinumblonde36 — 01:09 AM
Philco Predicta Siesta picture over time getting dimmer
This is what it looked like beforePlatinumblonde36 — 01:01 AM
Philco Predicta Siesta picture over time getting dimmer
Platinumblonde36 — 12:58 AM
Philco Predicta Siesta picture over time getting dimmer
Platinumblonde36 — 12:57 AM
Philco Predicta Siesta picture over time getting dimmer
I'm finding some strange things in my set and for the most part it's also original, so I need to start going over everyt...Platinumblonde36 — 12:55 AM
12' Philco
Not anymore Mike. Andre The Giant Born: May 19, 1946, Coulommiers, France Died: Jan 28, 1993 (46 years), Paris, Fran...RodB — 11:53 PM

[-]
Who's Online
There are currently 5049 online users. [Complete List]
» 1 Member(s) | 5048 Guest(s)
Avatar

>