Voltage at terminals 25 and 30 BeePre [resolved]

[Yossihaimberg]

Hi,

Checking the voltage at 25 and 30 shows 0 VDC....  (should be close to 10 VDFC per page 55 of the manual)

All other readings so far were on target:

31 and 33 = 250VDC
Filament out 6.3 VDC on both sides
4 and A4 or A1  445 ohm
14 and B1 or B4  445 ohm


I checked and triple-checked the wiring; they all seem fine.

Please help....

 

[Paul Birkeland]

Do you have 300Bs in the tube sockets? 

If so, carefully measure the DC voltage between pins 1 and 4 on each 4 pin socket and report that back.

 

[Yossihaimberg]

A(1-4) 4.95 VDC

B(1-4) 4.98 VDC

 

[Paul Birkeland]

What DC voltages do you see at pin 2 on each 4 pin socket?

 

[Yossihaimberg]

Between pin 2 and which pin?

 

[Paul Birkeland]

Ground.

 

[Yossihaimberg]

A(2-ground)  103 VDC

B(2-ground)  103.4 VDC

 

[Yossihaimberg]

Problem solved!!

I may have forgotten to insert the 30-0Bs before checking the voltage. The readings now are correct at 10VDC between 14 and 25 or 30.

Thanks again for your amazing support!