I¡¯m still struggling with my V2. I have more recently replaced a HV power switch. It wasn¡¯t without cost. When removing the front panel, I neglected to notice the line ?from the knob to the variable got caught on the meter shunt and stretched it so that now it¡¯s loose. It didn¡¯t break but it looks like I¡¯ll have to pull the front off again to repair it. One step forward 2 steps back.
I can¡¯t get the screen voltage on the 6146s below 425vdc. I think 175 is what the tubes need. I¡¯ve got 600vdc at the slider resister R13 and Johnson uses a 20k, 20w resister to drop the HV going to the screens. I¡¯m using the combo 40k and 60k resisters in parallel to get the drop with no luck. In trying to reduce this voltage to 175, I pulled the 60k out and left the 40k in which is 20k more than the original dropping resistor.
The mod uses the 40k in its original position coming off of R13 and places the 60k off of T4 to improve the screen supply of the 6146s. I¡¯ve tried it both ways including the original configuration with increased resistance with no luck.
Do we have any V2 experts to explain what I¡¯m missing here? ?I just don¡¯t see the resistance needed here doing what it needs to do dropping that voltage from 600 to 175.
Thanks,
Tom N5AMA
