Based on advice on here I've decided to upgrade to a triode SDS cap board. I have a KTA Hifi Driver board, so my E19/E20 B+ Voltages that I'm looking for are 380v/250v. I've got the board hooked up with jumpers on the bench, and I am finding my R9/R10 resister values (the 6.8k/~22K from quad cap). to go WAY low to get my 380/250. My B+ coming at the first stage settles to ~410, which is a little low (420-450 is normal, right) but I've tried different rectifier tubes so I'm thinking that's just how it is. But even with 2.7K/14K resisters the driver board B+ is still too low.
My question is -- is there anything to worry about? Or do I just use whatever resister values I need, or even jumper the R9, to get the desired voltages? On forums I am reading people using 6.8/50K resister combos to get the desired voltages of 380/250. Though perhaps this board is setup different then a reg quad cap.
Anyone have experience with this?
EDIT: Actually looking further it seems like the voltage is too low, as first quad cap stage should be like 480, not 410, right? Okay so my steps are to confirm rectifier is putting out ~480 at pin 8 disconnected. If that's the case, where should i be looking for my voltage drop? I have the bias pots all set to 0v as I'm testing the board, does that matter? Thanks!
EDIT #2: Okay I promise this will be my last edit. I am confused because I have seen Bob post a voltage chart like this
GZ34 – Pin 2 to ground – 420 - 450 volts DC
Pin 8 to ground – 420 - 450 volts DC
Pin 4 to ground – 355 - 380 volts AC
Pin 6 to ground – 355 - 380 volts AC
Any EL34 – Pin 1 or pin 8 to ground – approx .400 volts DC (depends on bias setting)
Across pins 2 and 7 – 6.0 – 6.5 volts AC
Pin 3 to ground – 400 - 435 volts DC
Pin 4 to ground – 400 - 435 volts DC (usually 1 or 2 volts higher than pin 3)
Pin 5 to ground – minus 30 to minus 40 volts DC
Pin 6 to ground – minus 30 to minus 40 volts DC
Pin 8 to ground – approx .400 volts DC (depends on bias setting)
Quad cap –-- Section # 1 (square symbol) –------ 420 – 450 volts DC
Section # 2 (half circle symbol) --- 420 – 445 volts DC
Section # 3 (NO symbol) ------------- 420 – 445 volts DC
Section # 4 (triangle symbol) ------ 380 – 420 volts DC
And yet somewhere else I have seen an identical chart that has ~480 on the PIN GZ34, and about +50v more on each stage of the quad cap. I believe above is for a VTA driver board.
I guess my question is -- does/can the driver board (in my case the KTA HiFi one) alter all the quad cap voltages? And in that case as long as my disconnected from Cap Pin 8 Rectifier reading is good, should I just adjust resister values as needed to get my desired voltages? It still seems weird that mine are so different from others using the same board.
Sorry for the long post