I spent a few minutes on the HMV 5101 last night after shifting the STC 236 back to its home. Interesting, the guy has managed to get a 32V Washing m/c. Clothes Iron & a few other items to go with the 32V Farm display & the radio is part of it.

However, in the process of wire tracing 5101 around the floating cap a couple of interesting nasties. Volume control was supposed to be 2M tapped? That is not what is there, & no tap. Some new resistors where an attempt has been made to compensate.

Scary was a wire from the choke, with a rat hole in the insulation, factory wired to pin one of the KT66 socket. Never unusual for that sort of thing to happen. However, its got a 6L6 in it, and its metal!. That means that the body of the 6L6 is alive?

Modification in order. This is a trap as 6L6 is a replacement for KT66

Marc

The radio probably worked fine with the 6L6 shell being "hot" with B+ voltage. This would look like a signal ground to the tube, I'm not sure if the metal shell of the 6L6 forms the envelope to contain the vacuum of the tube (with glass seals in the base, and the metal shell attracting stray electrons to it if it's at B+), or if there is a glass envelope just inside the metal shell. In any event, it is definitely a hazard to have a couple hundred volts on the metal shell of that tube!

It has been an interesting low priority job. i.e. there is no urgency so one is just picking at it, between other jobs. Normally metals are like the Philips "Metallised" one where the metalisation is the shield and the body

It was supposed to work: Yeh!
The caps were supposed to have been tested: What! Aged electrolytic ones & wax paper.. never. Tested a couple & dumped the lot
Seven dry joints.
Then the tube which is not a factory fault.
Stringing was beyond him.
2 Pole switch on the speaker to change over to extension speaker: Broken whole sector of one pole missing.
Rewired dial lights: Short.

Tend to get a Dog like this annually.