Cindy is coming soon. Help Please

[fishy]

Gary,
Ron posted all the voltages from his second build here.

https://tubeamparchive.com/viewtopic.php?t=5901

These should help.
Remember all tubes are in for this. You may have slightly different values but thats OK.

What is the range on the trimmer? Is the max voltage -26V?

Pete

[gahult]

Trimmer is a 25k, checks 0/24K.

Bias min/max is now -24.5v/-33.0v

Gary

[fishy]

Gary,
Talking out loud here and hopefully making some sense. I'm learning to fly here aswell
The V2 plate voltage looks quite high to me by ~30v. Based on two voltage sets I've seen. Ron and Phil_S
The V3 plates look marginally low based on the same data. It would seem logical if the plates were either all higher or all lower but not a mixture if the cct does not differ.

If what I'm saying makes sense, maybe check the B+ voltages at the plate resistors. Almost looks as though B3 & B4 are reversed. The obvious place would be under the board with the jumpers.

[gahult]

Here are some readings with all tubes in:

B1 403v
B2 390v
B3 296v
B4 275v
B5 258v
Bias -35v


V1
p1 153v p2* p3 2v p4 3.1v p5* p6 180v p7* p8 1v p9 3.1v

V2
p1 240v p2* p3 2v p4 3.1v p5-p8* p9 3.1v

V3
p1 182v p2 26v p3 41v p4 3.1v p5* p6 176v p7 28v p8 41v p9 3.1v

V4
p1* p2 3.1v p3 405v p4 389v p5 -35v p6* p7 3.1v p8*

V5
p1* p2 3.1v p3 405v p4 389v p5 -35v p6* p7 3.1v p8*

*= no connection

Thanks,

Gary