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adeep42 · 2100

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Offline adeep42

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on: June 28, 2019, 07:02:22 AM
Been moving along slowly and carefully since previous issue. Just completed build, Resistance checks are perfect. Some of the voltage checks seem to be out of the 10% +/- range, Particularly 1A and 1B.

1A   140
1B   272
OA   138
OB   132
OC   93
OD   97
OkA  95
OkB  98
OkC  1.39
OkD   .867

Your thoughts.

Thanks and best,

Alan





Offline Paul Birkeland

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Reply #1 on: June 28, 2019, 07:31:10 AM
IA and IB come from the regulator that's built on/above the D socket.  If you remove those blue wires from IA/IB on that main C4S board, what do you now see at +reg on the C4S board above the D socket?

It is possible that there's still an issue at the D socket that needs to be resolved.

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline adeep42

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Reply #2 on: June 29, 2019, 04:51:59 AM
Good Morning Paul,

It's 7:45AM your time. It's okay with me if you don't get to this til Monday.

  A side +reg  196.5 VDC
  B side +reg  291.00 VDC 


Offline Paul Birkeland

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Reply #3 on: June 29, 2019, 06:09:02 AM
Yeah, at least one side of your regulator board isn't working again.  I would recheck your Kreg voltages and double check those D socket connections again.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline adeep42

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Reply #4 on: July 01, 2019, 07:59:32 AM
Just finished total check of D socket and Shunt Regulator Board. Now voltage at the MJE5731As is A @ 295, B @ 294.


Offline Paul Birkeland

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Reply #5 on: July 01, 2019, 09:54:14 AM
So now neither regulator is working properly.  Are all the tubes still glowing?  What voltage do you get across the 6.3V terminals on the power supply board?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline adeep42

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Reply #6 on: July 01, 2019, 05:19:55 PM
Tubes all glow.

Voltage is 6.3vDC.

LEDs on A side of shunt regulator light up and are steady. LEDs on B side flash several time and then go out.


Offline Paul Birkeland

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Reply #7 on: July 02, 2019, 05:44:53 AM
This is with the wires going to IA and IB on the front board disconnected right?

What are the Kreg voltages on the board above the D socket?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline adeep42

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Reply #8 on: July 02, 2019, 10:19:10 AM
NEW BALLGAME!

My mind is spinning. Keep going over everything touching up solders, etc.  Found a mistake. White wires from D socket went to the wrong kregs. Switched them. Reattached wires to IA and IB. Only 2 voltages now outside the range.

IA   110.4  ?
IB   218
OA  108.3   ?
OB  154
OC  94.9
OD  96.6
OkA 95
OkB 98
OkC 1.5
OkD .866



Offline Paul Birkeland

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Reply #9 on: July 02, 2019, 12:33:52 PM
With the Kreg wires properly installed, how did the regulator board check out before you hooked it back up to the front C4S board?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline adeep42

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Reply #10 on: July 03, 2019, 06:01:20 AM
A Side MJE5731A   220VDC
B Side                   177VDC-off by 15%


Offline Paul Birkeland

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Reply #11 on: July 03, 2019, 06:08:59 AM
OK, I would leave the IA/IB wires off the smaller C4S board and debug the shunt regulator.  What are its Kreg voltages?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline adeep42

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Reply #12 on: July 03, 2019, 06:29:59 AM
kreg A   3.21

kreg B    .625


Offline Paul Birkeland

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Reply #13 on: July 03, 2019, 06:40:55 AM
What's the voltage at the X terminal on the B side?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline adeep42

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Reply #14 on: July 03, 2019, 06:48:27 AM
175 vDC


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