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Old 23rd September 2013, 10:58 PM   #1
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Default HELP ! My SSE voltages are way off.

I'm doing my SSE checkout using Ty Bower's checkout routine.
With the amp unplugged all the resistances checks are spot on.
The problem is my voltage readings are way off.

Testing pins 4 and 5 in the 12at7 socket and pin 2 on the power tube
sockets I'm getting 7.15v instead of closer to the expected 6.3v

On the 5ar4 socket I'm getting 5.45v
The major issue is with pins 4 and 6 in the 5ar4 socket - I' getting
only 205v instead of the over 400v I should be seeing.

I wired it for basic triode operation with no CFB.
The choke is wired in but no auxiliary cap.

All my transformers are Edcors - XPWR035, CXSE25-8-5K opts and
CXC125-10H choke.
I fitted my board for both solid state and tube rectification but right
now I'm only using solid state.
I also have a CL90 on the switch side from the power input.

I'd appreciate any help from the forum. I've triple checked all
wiring connections and they look fine.
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Old 24th September 2013, 12:21 AM   #2
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Did you check that the output from your transformer is correct?
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Old 24th September 2013, 06:49 AM   #3
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The voltages for the 6.3 and 5V windings are fine. They are within spec, given that the transformer has no load. As to the B+ voltage, it sounds like you don't have the secondary wired correctly.
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Old 24th September 2013, 12:52 PM   #4
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Originally Posted by rknize View Post
The voltages for the 6.3 and 5V windings are fine. They are within spec, given that the transformer has no load. As to the B+ voltage, it sounds like you don't have the secondary wired correctly.

Thanks Russ, I'll double check that again and report back.
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Old 24th September 2013, 03:01 PM   #5
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Originally Posted by rknize View Post
The voltages for the 6.3 and 5V windings are fine. They are within spec, given that the transformer has no load. As to the B+ voltage, it sounds like you don't have the secondary wired correctly.

Okay, I did another check, here's my XPWR035-120 secondary connections -

5v yellow wires to T1-YEL terminals

6.3v brown wires to T1-GRN terminals

high voltage red wires to T1-red terminals, center terminal not used

black-red high voltage center tap to one of the T1-red-yel terminals

All the connections are tightly screwed down on the terminals.

Is it possible the high voltage windings could be faulty ? Can I test
this with a multimeter ?
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Old 24th September 2013, 03:39 PM   #6
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Harry, did you check the solder connections on the terminal blocks for the B+? It could be that they're screwed down securely but lacking a good connection to the board itself.

edit: When you say it's wired for solid state and tube recto, and that you're only using solid state at the moment, do you mean the amp is working with solid state rectification?

Last edited by Sodacose; 24th September 2013 at 03:43 PM.
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Old 24th September 2013, 03:56 PM   #7
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Also, did you see the other thread about the inrush limiter/jumper from the recto tube to ground? Sounds like you installed your CL90 on the switch side. If so, did you install a jumper where the limiter would otherwise be installed on the board?

Possible SSE board mistake?
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Old 24th September 2013, 04:46 PM   #8
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Originally Posted by Sodacose View Post
Harry, did you check the solder connections on the terminal blocks for the B+? It could be that they're screwed down securely but lacking a good connection to the board itself.

edit: When you say it's wired for solid state and tube recto, and that you're only using solid state at the moment, do you mean the amp is working with solid state rectification?

I started to think about the solder connections and then I saw your post so
I checked and these look fine after a continuity check.

My board is the new one with the IN4007 diodes and CL140 inrush limiter.
All of these are in place. I did a check on the diodes and I get 590v forward
voltage.

Yes, it is on solid state rectification right now, I'll install the switch after I
get it working.
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Old 24th September 2013, 05:49 PM   #9
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Did you also check the soldering on the recto tube pins? If your amp works with solid state rectification, I don't think there would be a problem with the transformer or block terminals. If you have an extra rectifier tube, I'd try that after checking the pins.


Edit: I don't have my board in front of me, but did you make sure to remove/isolate the solid state rectification from the circuit before trying a tube rectifier? That's otherwise the purpose of the switch and it sounds like you haven't installed that yet.

Last edited by Sodacose; 24th September 2013 at 06:07 PM.
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Old 24th September 2013, 06:04 PM   #10
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Originally Posted by Sodacose View Post
Did you also check the soldering on the recto tube pins? If your amp works with solid state rectification, I don't think there would be a problem with the transformer or block terminals. If you have an extra rectifier tube, I'd try that after checking the pins.
Actually I've just finished wiring up the amp. I'm doing initial checkout per
Ty Bower's checkout routine WITHOUT tubes installed. I'm trying to make
sure that my B+ is okay before I plug in the tubes and hook up speakers.
I did check all the tube pins when I populated the board but no harm
checking again.
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