Please click your language flag. Bitte Sprachflagge klicken.

pilot: Too many tubes

Martin Renz Ernst Erb Vincent de Franco Martin Bösch Bernhard Nagel Otmar Jung Heribert Jung Eilert Menke 
Please click the blue info button to read more about this page.
Forum » Radios and other type of sets (Physics) etc. » MODELS DISPLAYED » pilot: Too many tubes
Victor Ford
USA  Articles: 3
Pict.: 2
15.May.17 18:48

Count of Thanks: 3
Reply  |  You aren't logged in. (Guest)   1

The Pilotuner T601 schemetic shows 5 tubes/valves. Mine has a 6th tube under the chassis. A 6C4. Not sure where to go from here. I replaced all caps, and all 6 tubes are good. Just trying to figure out why the 6C4?

Bernhard Nagel
Bernhard Nagel
D  Articles: 1598
Schem.: 2398
Pict.: 7141
15.May.17 20:19

Count of Thanks: 3
Reply  |  You aren't logged in. (Guest)   2

Hello Victor,

please show some pictures of your Pilotuner T601 to help determine if this is an original factory variant or a later modification.

Thank you.

Robert Weaver
CDN  Articles: 34
Schem.: 12
Pict.: 11
06.Jun.17 10:25

Count of Thanks: 2
Reply  |  You aren't logged in. (Guest)   3

I've never seen any documentation to indicate that there was ever a version with an added 6C4. I think that this was likely a user modification, not done at the factory. It's not normal for a factory built product to have a tube mounted under the chassis. As Bernhard suggested, a picture would be very helpful.

Off the top of my head I can think of a couple of reasons for adding this tube. The most likely is to get a bit more audio output. The other possibility (less likely) is that it is part of an added AFC circuit.