Not wanting to wreck my tubes, I set up just the rectifier tube and
fired the board up to see what I get. I am getting very funny readings.
Is this because I don't have the preamp and power tubes in?
I am using a NOS CBS 6AX5GT that tests fine, kinda at the bottom of the range, but still good on my Accurate 157.
My power and standby switches are on. I am using J6 pin 3 as the test
ground.
Here are some of my voltages.
Pin Should Is
V1
1...............0 .............0
2 ...........147.............330
3............1.8..............0
4 ..............0..............0
5 ...........147..............330
6.............1.8.............0
7............6.3 +51.........3
8............6.3 +51.........3
V2
1..............0..............0
2..............6.3 + 51....not measured
3..............324 AC......~300 AC
4..............0..............0
5..............324 AC......~300 AC
6..............0 ..............0
7 ..............6.3 + 51.. not measured
8 ..............333 ........ 430
V3,4
1..............0..............0
2..............54..........+3.5
3..............308...........420
4..............0..............0
5..............0..............0
6..............0..............0
7..............48...........-3.5
8..............0..............0
J6
1..............324...........410
2..............0..............0
3..............0..............0
4..............324...........410
J7
1..............319..............410
2..............319..............410
Am I doing something wrong?
Power transformer doesn't get warm, all seems in order.
I obviously don't want to risk my tubes until I know more.
Thanks,