RCA "Deluxe" Portable KCS-111D

[JSMCMS]

Ok. After replacing the selenium rectifiers with silicon diodes, I used a 33 ohm 25 watt resistor to get the B+ voltage right at 275VDC when line voltage is 124VAC. The resistor is added right after the rectifier diodes and before the filter caps. It drops 12 watts and it is chassis mounted to help heat dissipation. I used a 50 ohm, 20 watt ceramic resistor and replaced the existing 18 ohm dropping resistor in the heater string. It drops 9 watts of power making the heater string right at recommended value of 103VAC.

Now that I’ve got that sorted, I need to figure out why the horizontal is too wide and the high voltage is too low (~10k). I’m pretty sure the 17DQ6A horizontal output tube or the 17AX4GT damper tube (or both) are just tired so I’ll just do some swapping to see if I can improve it. If not, I’ve got a good picture and I’ve got a case to clean and paint.

What do you guys think?