Questionable voltage readings, should I proceed?

[GilSt]

Hello.

First, let me express my deep appreciation of your work. Being my first DIY project, stock Crack assembly was easy and it sounded great!

Yesterday I finished the speedball upgrade, plugged in and the left PC board didn't lit its LEDs.

After rechecking I found my mistake - attached black wire to wrong terminal: instead of G - to a near-by R4 one. (bottom image on Page 22 of the manual)
After the correction, everything lit up properly, and I started with the voltage check.
Those are the voltage readings:

Terminal Expected Actual
1       75       84      
2       170       155
3       0          0
4       170       155
5      75       108
6       0          0
7       100       101.7
8       0          0
9       100       117
10       0          0
11       0          0
12       0          0
13       170       154.3
14       0          0
15       185       173

20       0          0
21       206       192

A1       75       107
A2       0          0
A3       1.56       1.54
A4       0          0
A5       0          0
A6       75       83.4
A7       0          0
A8       1.56       1.54
A9       0          0

B1       75       83.3
B2       170       153.3
B3       100       101
B4       75       108
B5       170       153.5
B6       100       117
B7       0           0
B8       0           0

Some of the readings exceed even 15% margin.

Should I proceed to final check?

Thanks!

Note: We ordered a batch of 3 kits. Another member reports very similar results (haven't been able to contact thrid member yet). He also reports a slight static noise in left channel.

 

[Bolivar]

I had very similar voltage readings at first with my crack + speedball. Replacing the 12AU7 driver tube solved the issue.

 

[Paul Joppa]

Yes, it looks like one section of the 12AU7 is low on transconductance. It may come around in a while - like, 50 to 100 hours of operation. New tubes sometimes do not have the cathode emission fully developed. Nothing is so far out of line that it will cause harm.

 

[GilSt]

Thanks for the replies.
As advised I replaced stock tube to a JJ 12AU7  (also new) and the readings are now fine (except 170V are all 155V).

The sound is now amazingly crispy. Sennheiser veil is long gone.