02-21-2017, 11:04 PM
Just a quick update on progress of the receiver.
Got the rectifier installed. This pic. is in the trial stage. I wanted to locate it away from the 15 ohm 5 watt resistor so I used a terminal strip.
[Image: http://i1336.photobucket.com/albums/o654...virhco.jpg] Also installed a line safety cap and a inrush current limiter.
[Image: http://i1336.photobucket.com/albums/o654...0tpetj.jpg]
Changed out the coupling capacitors and added the 4-10 ohm 1/4 watt resistors to the output tubes.
[Image: http://i1336.photobucket.com/albums/o654...xmfhe7.jpg] So far so good. I did run into a problem on one of the 12at7 tubes in the MPX section.
tube V100 called for 95v on the plate and 7v on cathode. On 1/2 of tube. I was getting .855v on cathode and 129v on the plate.
I changed the tube and still not correct but better. Now getting 5v on cathode and 112v on plate.
Checked the resistors in that part of circuit and they are all very close or spot on.
The second half of tube the voltages are correct.
It's playing very well on the bench but does have some scratching while tuning .
I'll be addressing that tomorrow with a good cleaning of the tuner.
If anyone has ideas about the V100, tube voltage please let me know.
Got the rectifier installed. This pic. is in the trial stage. I wanted to locate it away from the 15 ohm 5 watt resistor so I used a terminal strip.
[Image: http://i1336.photobucket.com/albums/o654...virhco.jpg] Also installed a line safety cap and a inrush current limiter.
[Image: http://i1336.photobucket.com/albums/o654...0tpetj.jpg]
Changed out the coupling capacitors and added the 4-10 ohm 1/4 watt resistors to the output tubes.
[Image: http://i1336.photobucket.com/albums/o654...xmfhe7.jpg] So far so good. I did run into a problem on one of the 12at7 tubes in the MPX section.
tube V100 called for 95v on the plate and 7v on cathode. On 1/2 of tube. I was getting .855v on cathode and 129v on the plate.
I changed the tube and still not correct but better. Now getting 5v on cathode and 112v on plate.
Checked the resistors in that part of circuit and they are all very close or spot on.
The second half of tube the voltages are correct.
It's playing very well on the bench but does have some scratching while tuning .
I'll be addressing that tomorrow with a good cleaning of the tuner.
If anyone has ideas about the V100, tube voltage please let me know.