Hello:
I’m shopping for a volume control/on-off switch for my Philco 116B. The original is Part No. 33-5022, 2 meg ohms, tapped at 400,000 ohms.
Does the replacement volume control need to have the identical values as the original volume control? Or, do I have some flexibility? Does the answer change depending on whether we are considering the overall value (2 meg ohms) of the volume control versus the value of the tap (400,000 ohms)?
Thank you!
Allen
Santa Barbara, CA
I pulled up the diagram and I didn't see anything that makes it partially critical. Some sets they are connected across the avc line which in a lower value would load/lower the avc voltage. All on the signals are capacity coupled so there is no effect on the voltages.
Something from 3M to 1.5M should fine. The tap not being @ 400K may shift the tone a very slight amount but as long as it's with in reason (300-500K). I bought a control from Mark Oppat
https://www.oldradioparts.net/controls.htm If you do use him heads up the site stinks call him it's easier. For what it's worth mine was abt $30 w/the ride.
So how's it coming along? Are you in the home stretch? Early or late model 116? All of the 16/116B's are impressive players. Lots and lots of volume with good tone (especially non code 121). Later ones with the rf stage are very sensitive and pick well. The early models (121) w/o the rf stage are less noisy and the sensitivity is still good. Also the dial is less crowded as the distance between kc's is more, but no long wave.
GL
Hello Terry:
Thank you for taking time to review the schematic and provide a helpful reply. Having some flexibility will make it easier for me to locate a replacement switch.
My sister picked up this radio for me ($40.00). It is the early version 116B, with the shoulder cabinet and 10-inch speaker. A blow to the front broke the cast iron portion of the band switch and separated the sides of the cabinet. I re-glued the cabinet and am picking up missing parts before I begin the electronic restoration. I’ve had good luck so far. I obtained the band switch part from Nathan Slingerland. Tubes from FindATube. Knobs from Julie McCall. I even found the missing aluminum electrolytic capacitors on eBay. What luck. Now for the volume control and schematic/service bulletins. I hope The Philco Repair Bench resumes selling schematics soon.
Happy holidays.
Allen