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

40-150 issues
#11

Remember: you have not idntified the problem until you have identified the problem Icon_smile
Now roughly, 41 tube has about 8k load at this voltage, and say the voice coil is 4 ohm, so the ratio is 2000 and square root of that is roughly 45.

So, roughly speaking, if you apply 45 V from the variac between the centertap and eityer end you shoud see 1V output. Bring it up slowly, listen to buzz and look for heat and smoke.

If the voltage is higher or lower it is OK as long as it is sensible.


Another way is, connect the full primary (ends) in series with 110V light bulb (table lamp, low wattage, like 10-20 watts) and plug it in isolated variac at 110V. Keep the seconday open. The lamp should not glow. Then short the secondary. The lamp should start glowing.
If the lamp glows with the secondary open, there is a turn(s) short, no matter where. Then shorting the secondary should have no effect.

Be careful and observe safety precautions. Do all cconnecting and disonnecting after first bringing the variac voltage to zero.


Messages In This Thread
40-150 issues - by RGallahue - 06-16-2012, 11:20 AM
RE: 40-150 issues - by morzh - 06-16-2012, 12:37 PM
RE: 40-150 issues - by RGallahue - 06-16-2012, 02:32 PM
RE: 40-150 issues - by morzh - 06-16-2012, 04:02 PM
RE: 40-150 issues - by RGallahue - 06-16-2012, 06:04 PM
RE: 40-150 issues - by 7estatdef - 06-16-2012, 06:34 PM
RE: 40-150 issues - by morzh - 06-16-2012, 07:53 PM
RE: 40-150 issues - by RGallahue - 06-16-2012, 08:15 PM
RE: 40-150 issues - by morzh - 06-16-2012, 08:31 PM
RE: 40-150 issues - by RGallahue - 06-16-2012, 09:34 PM
RE: 40-150 issues - by morzh - 06-16-2012, 11:05 PM
RE: 40-150 issues - by RGallahue - 06-17-2012, 10:38 AM
RE: 40-150 issues - by morzh - 06-17-2012, 11:27 AM
RE: 40-150 issues - by RGallahue - 06-17-2012, 11:46 AM
RE: 40-150 issues - by morzh - 06-17-2012, 01:47 PM
RE: 40-150 issues - by 7estatdef - 06-17-2012, 02:24 PM
RE: 40-150 issues - by RGallahue - 06-19-2012, 08:12 PM
RE: 40-150 issues - by morzh - 06-20-2012, 05:45 PM
RE: 40-150 issues - by RGallahue - 06-20-2012, 06:16 PM
RE: 40-150 issues - by morzh - 06-21-2012, 10:51 PM
RE: 40-150 issues - by morzh - 06-23-2012, 01:21 PM



Users browsing this thread: 5 Guest(s)
[-]
Recent Posts
American Bosch Model 802 auto radio
I think it would come under either American Bosch or United American Bosch. American Bosch made sets for the American We...Arran — 05:53 AM
trying to identify this wire type
Thanks to all for the feedback. As Arran said, it is probably an older replacement and yes it has a grid cap so I will ...georgetownjohn — 09:32 PM
trying to identify this wire type
It's possible that the red wire, actually a grid cap lead, is a very old replacement, I can't remember seeing a pre 1939...Arran — 09:18 PM
Gilfillan Brothers Car Radio?
Hi everyone,  Special thanks to Joe Rossi for tracking down this obscure radio and thanks to others who took up the hun...Antipodal — 08:15 PM
trying to identify this wire type
Here's one source for your wire of many. Take care and BE HEALTHY! Gary P.S. Can't get the right color you need? I ...GarySP — 06:40 PM
trying to identify this wire type
...and modern wire of the appropriate gauges and insulation V-rating (300V minimum, usually shown right on the wire) is ...morzh — 05:47 PM
1930s Stromberg-Carlson Tombstone Radio need help identifying model number
I have a question about this radio, is there anyone that has access to this radio that has an intact unmolested speaker ...captainclock1988 — 04:28 PM
1930s Stromberg-Carlson Tombstone Radio need help identifying model number
Well what makes me confuse all of those companies is that all three of those companies (Setchell-Carlson, Stromberg-Carl...captainclock1988 — 04:21 PM
trying to identify this wire type
The red wire is rubber covered wire. The others are cotton braid over rubber often in colors or a tracer, also strand...Chas — 02:43 PM
trying to identify this wire type
Greetings Phorum members, Hope you can help me identify this type of wire in the photo I have attached.  I am not sure ...georgetownjohn — 01:53 PM

[-]
Who's Online
There are currently 6156 online users. [Complete List]
» 1 Member(s) | 6155 Guest(s)
Avatar

>