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

37-116 different heater values
#6

The hum balance pot has no effect on the actual heater voltage applied the various tubes. It only affects the relative AC voltage as measured to chassis ground seen by the output tube filaments.

Looking at the schematic, it appears that there are more heaters fed by the Fil 2 winding than the Fil 1 winding. This would place a greater load on Fil 2, resulting in slightly lower heater voltage to those tubes. The tubes you mentioned are fed from Fil 2 and would consequently read a lower heater voltage.

This appears to be normal and inherent in the design. I would not be overly concerned, as 5.8 VAC on the heaters is still within the + and - 10% tolerance specified by the tube manufacturers.


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: 1 Guest(s)
[-]
Recent Posts
12' Philco
If it is 12', either Kareem or Andre would have to jump pretty high to look at the front panel. Kareem would have an e...morzh — 01:48 PM
12' Philco
And here's a story about the tires on the truck. Same "no-stoop" guy must have installed these! Take care a...GarySP — 01:17 PM
Hickok AC51 tube tester
I think they have only shown the secondaries of the transformer. Two of them feed the rectifiers' filaments.morzh — 12:58 PM
IF can wire size and Rubber mounts?
Arran If the wire inside cans is the gauges you mentioned, the sole reason for that would be mechanical, to stiffen t...morzh — 12:56 PM
12' Philco
Rod, Yes, I know, but the Giant Philco is not around anymore either, so I go by whoever was alive fairly recently. H...morzh — 12:54 PM
Hickok AC51 tube tester
Absolutely no one is going to reverse engineer that circuit. Even the iron core is missing.RodB — 10:37 AM
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

[-]
Who's Online
There are currently no members online.

>