01-20-2010, 07:57 PM
I posted this morning but I must have hit the wrong key as I don't see it here on the forum. Things are tougher after 35 and way back in my rear view mirror.
OK pin #2 - 37 #44 514 ohms #46 260k ohms #51 24k ohms resistance antenna is 28 ohms .This is touching chassis and wire to antenna .
thanks for pics helps a lot.
Denver
To be clear, if you have a #37 tube in this set it will not work well. A # 37 is a 6.3 volt version of the #27 it will fit dandy but with only less than 1/2 the filament voltage on it the gain will be very low. #44 should be 500,000 ohms or 500K. K=times 1000. Not 500 ohms or .5K. Antenna coil resistance seem right, if it was a few 1000 ohms then I'd say it's open. -60vdc at the volume control is fine. It comes right off the bias voltage for the 45's control grid's.
Here's something else to try. Take your antenna wire and hook it to the grid cap of the #24A rf amp tube. Does this make an improvement on how loud it plays when the set is on and tuned to a station.? Do the same to the grid cap on the 24A mixer tube. Any difference?
Was visiting a radio friend and we got talking about your set and I was telling him that it would be handy if you had a signal generator. I gave me a spare he had. It's no great prize made about 1940.It's a Precision Model E-200C I had one just like it and used it for years. Generator tunes from 50KC to 120MC. If you want it I'm more than happy to give it to you. Let me know and I'll check it over to make sure it's working properly. Would like shipping cost covered. I may be able to dig up a manual for it too. Just PM me and we'll do it if you want.
Next installment we'll check the plate and screen voltage on the rf,mixer,&if tubes. By the time we get this beast work you'll be the next super tech!!
Terry
OK pin #2 - 37 #44 514 ohms #46 260k ohms #51 24k ohms resistance antenna is 28 ohms .This is touching chassis and wire to antenna .
thanks for pics helps a lot.
Denver
To be clear, if you have a #37 tube in this set it will not work well. A # 37 is a 6.3 volt version of the #27 it will fit dandy but with only less than 1/2 the filament voltage on it the gain will be very low. #44 should be 500,000 ohms or 500K. K=times 1000. Not 500 ohms or .5K. Antenna coil resistance seem right, if it was a few 1000 ohms then I'd say it's open. -60vdc at the volume control is fine. It comes right off the bias voltage for the 45's control grid's.
Here's something else to try. Take your antenna wire and hook it to the grid cap of the #24A rf amp tube. Does this make an improvement on how loud it plays when the set is on and tuned to a station.? Do the same to the grid cap on the 24A mixer tube. Any difference?
Was visiting a radio friend and we got talking about your set and I was telling him that it would be handy if you had a signal generator. I gave me a spare he had. It's no great prize made about 1940.It's a Precision Model E-200C I had one just like it and used it for years. Generator tunes from 50KC to 120MC. If you want it I'm more than happy to give it to you. Let me know and I'll check it over to make sure it's working properly. Would like shipping cost covered. I may be able to dig up a manual for it too. Just PM me and we'll do it if you want.
Next installment we'll check the plate and screen voltage on the rf,mixer,&if tubes. By the time we get this beast work you'll be the next super tech!!
Terry
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
