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

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

37-116 different heater values
#10

I owe you an apology Mondial. Everything is ok now. I have not removed the chassis from the radio so i measure all the tube voltages with a small washer that fits over a pin and a wire attached to it. Sounds odd but it works but goes slow. The other day as i stated i had that higher voltage on only one tube (the 6j5 and the nos i replaced it with) and all the others were lower, 5.8 at the time, The few i checked.

I have been using a bucking transformer to reduce my mains voltage currently at 123 today and was trying to use the heater voltage as a guide as i have stated. My bucking transformer lowers voltage about 12 volts so 111 to the set today . You had asked me to check a few other voltages and to be honest i did not even know about where the other filament tubes were. Thank you. I made a list from the schematic and off i went ------ all now at 6.0 or so volts - both filament strings ...hmmmm... i rechecked the offending tube (6j5) and sure enough at 6.0 volts.

SORRY!!, i don't know what happened. I originally checked the other tubes within a few minutes of finding that 7.0 volt 6j5 the other day when i got 5.8 volts on the other tubes..

So i think i know what happened at least some of it. When i rechecked today with mains at 123 and no bucking transformer attached ALL my heater voltages were about 7.0. My notes also show when the mains were at 117 the other day with the bucking transformer on i had heater voltages at 5.8. ( so about 106 at the set) So... maybe the bucking transformer maybe it malfunctioned during that time, maybe by pulling the tubes i reconnected a bad contact ( that has happened before ) ...I dont know. But all are at approximately 6.0 now except the the 6b4g's are at 6.3 nd 6.25. The plate voltage is a little low at 210 on a few i checked but i suspect that is because of the lower mains now.

So again i am sorry. This junior member did not mean to waste your time. I did learn some things so thank you.
I hope you will help me again in the future if the need arises.

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
RE: 37-116 different heater values - by poulsbobill - 05-02-2022, 08:55 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco 42-345 Restoration/Repair
Hi OSanders, Look carefully at the band switch. Turn it slowly and "wiggle" it around the desired band. ...MrFixr55 — 12:33 AM
5U4 vs 5Z4 tubes
I think that RCA and GE introduced metal tubes in the USA in 1936.  I don't know if they were being made by RCA, GE or b...MrFixr55 — 11:20 PM
Philco 42-345 Restoration/Repair
Vlad95, Thank you for the stringing guides and wow there are so manyosanders0311 — 06:01 PM
5U4 vs 5Z4 tubes
A pre war Hallicrafters, and an early one too, very nice! 1936 is pretty early for metal tubes too, which would explain ...Arran — 05:58 PM
Philco 42-345 Restoration/Repair
Thanks Rod, "When you hear the background hiss and no station it usually indicates that the oscillator quit" ...osanders0311 — 05:52 PM
Philco 42-345 Restoration/Repair
RodB :beerchug:Vlad95 — 10:22 AM
Philco 42-345 Restoration/Repair
Vlad, you nailed it. Swiss and German roots.RodB — 09:54 AM
5U4 vs 5Z4 tubes
Well this is a Hallicrafters SX/9 circa 1936. No real issues so far although I dodged a real bullet with a cap that was...bridkarl — 07:59 AM
5U4 vs 5Z4 tubes
The pinout is the same but the 5U4 has a 3 amp filament, verses 2 amps or less on the 5Z4. I think that the pinout of a ...Arran — 12:04 AM
Philco 42-345 Restoration/Repair
By the way. osanders0311 Take a look here: Dial cord stringing Guides May be here you can fount correct string settin...Vlad95 — 11:15 PM

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

>