11-10-2024, 02:39 PM
I managed to get some more time on this.
Hi Mr. FixIT,
The radio has been recapped. Many of the resistors were replaced. The tubes all checked good except the 6F6 they were marginal. I subbed in a good set and found no difference. As for the other tubes I don't have any others to try replacements. The secondary has one point grounded. Get .5 ohms from pin 8 to ground which is same as secondary of transformer. My radio is code 121 so we need to use the second schematic with all those X parts. The plate of the 2nd audio is 90 volts vs 135 per schematic. But the main schematic shows the plate resistor is 40K. The X parts schematic shows 99K which reads 101K. I did not replace that resistor. Maybe use 40K? That is one of the only two resistors in that third of the chassis I didn't change The plate of the phase inverter is 170 volts vs 180 volts per schematic. That is probably ok. I did not do anything with the aux jack you mentioned. Not 100 percent sure where to cut.
Mr. RodB,
The the three section candohm reads total of 139 ohms (96, 17, 25) vs schematic 88, 15, 23.Is that 96 ohm reading a problem? The 4 resistors on the 6F6s are pretty close to what they should be, not exact though (1K off). I don't understand with this: The 51k plate load should be pretty close to the cathode 50k. The schematic shows 51k plate and 5K screen. Please explain as I'm not sure what resistors. Is it the total of 85 and 87 resistors. If so they are close 51K cathode and 49K plate.
Thanks Guys,
Dan
Hi Mr. FixIT,
The radio has been recapped. Many of the resistors were replaced. The tubes all checked good except the 6F6 they were marginal. I subbed in a good set and found no difference. As for the other tubes I don't have any others to try replacements. The secondary has one point grounded. Get .5 ohms from pin 8 to ground which is same as secondary of transformer. My radio is code 121 so we need to use the second schematic with all those X parts. The plate of the 2nd audio is 90 volts vs 135 per schematic. But the main schematic shows the plate resistor is 40K. The X parts schematic shows 99K which reads 101K. I did not replace that resistor. Maybe use 40K? That is one of the only two resistors in that third of the chassis I didn't change The plate of the phase inverter is 170 volts vs 180 volts per schematic. That is probably ok. I did not do anything with the aux jack you mentioned. Not 100 percent sure where to cut.
Mr. RodB,
The the three section candohm reads total of 139 ohms (96, 17, 25) vs schematic 88, 15, 23.Is that 96 ohm reading a problem? The 4 resistors on the 6F6s are pretty close to what they should be, not exact though (1K off). I don't understand with this: The 51k plate load should be pretty close to the cathode 50k. The schematic shows 51k plate and 5K screen. Please explain as I'm not sure what resistors. Is it the total of 85 and 87 resistors. If so they are close 51K cathode and 49K plate.
Thanks Guys,
Dan