Quote:
Originally Posted by Jon1967us
It's definitely the 35W4 (B-) that is the source of AC ripple. It's a single diode, whereas the 25L6 (B+) is a dual diode and does a better job in smoothing out the DC.
I'm measuring 2.4VAC at the 35W4's plate and it gets dropped to 1.6v at the junction of the 10Ω and 270Ω - only .2VAC is leaving the smoothed DC coming from the 25L6.
I'm wondering if I should try putting a 47uF or something between the plate of the 35W4 and the 10Ω? |
you could start, by sticking an ammeter in series with the 10 ohm resistor, and using these specs, see if the tube is being overloaded or not,
https://frank.pocnet.net/sheets/093/3/35W4.pdf
if it IS being loaded beyond it's spec, you gotta track down what is loading it down, if not, the AC is bleeding in from something else, you should not have to mod anything to get it to work, within reason
