Siltronix 1011D no filament voltage

[demco satelite]

Powered up on my variac but no filament voltage to the tubes, so what do I need to look for? Yes a recap is in the plans.

 

[GlocknSpiel]

I'd check the filament windings of the transformer first for +12VAC, then at Pin5 and pin7 of the 12-pin socket and 'head west' from there.

 

[357]

is there a acc. jack in the back that needs a jumper like yaesu?
ok its a jones plug. are you feeding it 120V?
looks like pin 6 and 5 need to be jumped to get the heaters to turn on

 

[nomadradio]

Any chance the power cord is wired for a different radio that uses the same 12-pin plug?

73

 

[demco satelite]

Any chance the power cord is wired for a different radio that uses the same 12-pin plug?

73

Nope I used the one from my 1011c and no change

 

[nomadradio]

I would check the two fattest wires coming out of the power transformer, and follow them to the power socket. If a crummy solder connection has caused the problem, you'll see it there. And if you do a continuity check across those two wires with the power cord unplugged, a bad transformer secondary will show an open circuit.

Not a common thing to see fail.

73

 

[Smokinone]

I'm no expert, but https://www.transcendar.com/ rewinds transformers if it comes to that. I had an audio amp, Fisher, that had a bad transformer, I had the restorer send it to transcender for a rewind and it was rather inexpensive considering they no longer make parts for them. There are several other re-winders, transecender is in the bay area of ca.
Their service was fast and accurate, and everything was back to original.

https://www.heyboertransformers.com/tubeamps.shtml is another well thought of re-winder.

 

[nomadradio]

For the 150 bucks transcendar charges you could probably buy two derelict radios. Good chance a used transformer removed from a derelict will be okay. Only ones I ever saw fail were from lightning surges.

73