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

41-250 No sound, glowing 41 tube, can't be a good thing
#11

Here's an update on my 41-250--I installed the new Hammond transformer. I'm now getting sound from the speaker, but it's an oscillating sound from one of the output (41) tubes--the one that is glowing hotter than the other. Starting at the power supply I've run value tests and everything checks out okay until I get to the other side of the field coil. I'm getting a somewhat high 309v DC out of the rectifier (84), which then goes directly to the field coil where it comes out at 265v, but should be 180v according to the schematic. Of course this 265v gets passed through the new output transformer and to both output tubes. I checked the resistance of the field coil--1100 ohms dead on. I've checked many times all of the cap connections and everything is as it should be. Could the excessive voltage be a caused by a bad rectifier? Icon_confused


Messages In This Thread
[No subject] - by Harlan - 02-19-2008, 10:03 PM
[No subject] - by planigan - 02-20-2008, 12:34 AM
[No subject] - by justlrnin - 02-20-2008, 02:10 AM
[No subject] - by planigan - 02-20-2008, 03:21 AM
[No subject] - by Terry Judkins - 02-20-2008, 07:21 AM
[No subject] - by planigan - 02-20-2008, 02:08 PM
[No subject] - by Ron Ramirez - 02-20-2008, 06:51 PM
[No subject] - by justlrnin - 02-20-2008, 11:06 PM
[No subject] - by Ron Ramirez - 02-20-2008, 11:20 PM
[No subject] - by justlrnin - 02-27-2008, 03:18 PM
[No subject] - by rghines1 - 02-27-2008, 05:35 PM
[No subject] - by justlrnin - 02-27-2008, 07:33 PM
[No subject] - by Doug K. - 02-27-2008, 08:32 PM
[No subject] - by rghines1 - 02-27-2008, 08:50 PM
[No subject] - by FStephenMasek - 05-09-2008, 07:44 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
The list of my radio & TV collection!
A little bit of positivity in our feed... My new video... Test - the Philco 16B vs Philco 37-116 de Luxe / Test - the ...RadioSvit — 12:14 PM
Refinishing Ideas
Thanks. I will look into. Billpoulsbobill — 11:23 AM
My Philco 37-116 Restore
Why do the flood lights have 2 wires running to the shell of each light when the inner conductor only has one to each? ...dconant — 10:54 AM
Philco 46-480 Electronic Restoration
OOPS!! if there is a "flag" running up the side of the tube that touches the shield, then yes, a shield belon...MrFixr55 — 10:03 AM
Philco 46-480 Electronic Restoration
Thanks for pointing out that shield! I will try to find out where else it may belong. I simply installed it back where i...jrblasde — 10:02 AM
Philco 46-480 Electronic Restoration
Very nice job. A real contrast between how easy the main chassis is to work on, vs how tightly the RF chassis is packed...MrFixr55 — 09:31 AM
Philco 46-480 Electronic Restoration
After sleeping on it, I believe the issue is that I may have forgotten to install a ground connection between the RF cha...jrblasde — 09:21 AM
Refinishing Ideas
Hi Poulsbobl, I think that you could get away with it.  In the Philco Library, there is a parts listand specs for sp...MrFixr55 — 11:54 PM
Philco 46-480 Electronic Restoration
The sleeving for the transformer arrived early, so I went ahead and finished reassembling. The chassis looks far better ...jrblasde — 10:15 PM
Philco 610B oscillator wiring
I don't know what you are referring to when you say "tube cathode ground". Ground is a connection to the chass...RodB — 05:56 PM

[-]
Who's Online
There are currently 713 online users. [Complete List]
» 1 Member(s) | 712 Guest(s)
Avatar

>