09-01-2012, 04:00 PM
Well....I was thinking why my shortwaves a bit shy and the sector on my 6E5 is not fully closed, even when a local station is playing really loud.
Then I was thinking, why when I put my finger close to the detector, the volume really goes up.
Then I thought the 1st RF Amp tube was bad, but it is good. Then I took it out and the radio played same as with it in.
So....I measured the plate potential...zero..zilch....nada.
Oh...bother.
In short, the coil connecting the plate to the B+ is open. I was hoping to eschew the winding job....no such luck.
...OK. I have just removed the coil. Good news is this is superficial three turn winding and easy to repair. The tear was close to the end of the first turn. Will buy the wire tomorrow.
Then I was thinking, why when I put my finger close to the detector, the volume really goes up.
Then I thought the 1st RF Amp tube was bad, but it is good. Then I took it out and the radio played same as with it in.
So....I measured the plate potential...zero..zilch....nada.
Oh...bother.
In short, the coil connecting the plate to the B+ is open. I was hoping to eschew the winding job....no such luck.
...OK. I have just removed the coil. Good news is this is superficial three turn winding and easy to repair. The tear was close to the end of the first turn. Will buy the wire tomorrow.
