UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Heathkit HG10-B VFO

Peterdee · 13th May 2022, 10:03 pm

Hi Paula
The transformer I have only does 110v or 150v, I think 150v might be a little too high, I know, ideally 115v would be better. Pin 4 from the tx gives 268v dc to the dropping resistor, which drops it to 108v going to pin 1 of OB2, 108v is also emitting from pin 5 of the OB2, which checks with the schematic. The valve is glowing purple, but not very bright. Not having had experience of this valve before I don't know just how bright it should be.
On the key there is only .3v in opr position, which goes on keying down.
Hope this helps
Peter

13th May 2022, 10:03 pm	#5
Peterdee Triode Join Date: Jan 2017 Location: Poole, Dorsetshire, UK. Posts: 25	Re: Heathkit HG10-B VFO Hi Paula The transformer I have only does 110v or 150v, I think 150v might be a little too high, I know, ideally 115v would be better. Pin 4 from the tx gives 268v dc to the dropping resistor, which drops it to 108v going to pin 1 of OB2, 108v is also emitting from pin 5 of the OB2, which checks with the schematic. The valve is glowing purple, but not very bright. Not having had experience of this valve before I don't know just how bright it should be. On the key there is only .3v in opr position, which goes on keying down. Hope this helps Peter