05-23-2011, 11:27 AM
Well after having a closer look there isn't enough bias on the 47. Only about -4v and it has 260v on the plate. Transformer is rated @ 40ma. Measured the total HV current and it was 46ma. So what I did was remove the hv ct from ground and put in a few resistors. What did was give me a tap so I could come up with -15v for the 47 tube bias and it lowers the total hv. As it stands I got it down to 36ma total and the hv is about 190v.
Overall I'm happy with it. It still runs a bit warm but isn't unconformable to touch. Audio sounds good and clean with plenty of volume.
Terry
Overall I'm happy with it. It still runs a bit warm but isn't unconformable to touch. Audio sounds good and clean with plenty of volume.
Terry
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
