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Author Topic: Smashup Volatges Off 1 Side [resolved]  (Read 4728 times)

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Offline Paul Birkeland

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Re: Smashup Volatges Off 1 Side
« Reply #15 on: July 11, 2015, 04:32:19 PM »


+reg  (A side) 2.5V = .92V, 1.1V

You should recheck all voltages.  What voltage are you getting out of the filament regulator board?
Paul "PB" Birkeland

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Offline galyons

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Re: Smashup Volatges Off 1 Side
« Reply #16 on: July 12, 2015, 05:36:12 AM »
These voltages are different than I got when I posted 3 hours earlier.  I was getting 4.35V from the output of the filament regulator board.    Back to not so good! :(

Here are the voltages:

Line =120.3VAC

I to board ground =7.1V
O to board ground =3.3V

L200C pins to board ground
1 = 7.1V
2 = 3.3 V
3 = 0V, continuity to ground
4 = 2.2V
5 = 3.5V

IA   180-220V  = 204V, 204V

OA  150V ± 1%  = 150V, 149.4V

+reg  (A side) 2.5V = 0.89V, 1.1V

IB   150V ± 1%  = 150V, 149.4V

OB  45-75V  = 130V*, 58V    * ranges  between 127V and 133V

Kreg (B side) 3-5V = 4.7V, 5.0V

Breg (B side) 150V ± 1%  =150V, 149.4V

+reg (B side) 150V ± 1%  =150V, 149.4V

B1 0V= 0V
B2 150V= 150V
B3 3-5V= 4.7V
B4 0V= 0V
B5 150V= 149.4V
B6 3-5V= 5.0V

Cheers,
Geary
VPI TNT IV/JMW 3D 12/FR1 MkII Soundsmith retip >Eros TH+ Otari MX5050 IIIB2 > Eros + Aurelic Aries ANK Dac2.1B > BeePre >Paramount 300B 7N7 > EV Sentry IV-A

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Offline Paul Birkeland

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Re: Smashup Volatges Off 1 Side
« Reply #17 on: July 13, 2015, 01:50:42 PM »
Well, you have adequate voltage going into the board now, so that's a good start.

The regulator is set to put out about 4.2V, so your regulator is still not working.  There isn't any reason to muck around with the high voltage side of things before your tubes are properly heated.

Try pulling both tubes, then recheck the output of the regulator board.

Do both OB voltages measure at 130V, or is it one side is 130V on OB and the other side is 58V?

-PB
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline galyons

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Re: Smashup Volatges Off 1 Side
« Reply #18 on: July 13, 2015, 03:01:07 PM »
Well, you have adequate voltage going into the board now, so that's a good start.

The regulator is set to put out about 4.2V, so your regulator is still not working.  There isn't any reason to muck around with the high voltage side of things before your tubes are properly heated.

Try pulling both tubes, then recheck the output of the regulator board.

Filament reg board, no 4P1L  tubes :
7.1V
O 7.5V

Do both OB voltages measure at 130V, or is it one side is 130V on OB and the other side is 58V?

These voltage vary from time to time, but, yes, there is consistently  an approximate 2:1 voltage differential at OB on each side.
Current measurement is: 150V, 77V
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Offline Paul Birkeland

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Re: Smashup Volatges Off 1 Side
« Reply #19 on: July 15, 2015, 08:35:12 AM »
Repeat the regulator board voltage measurements with the left tube in, then with just the right tube in.

-PB
Paul "PB" Birkeland

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Offline galyons

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Re: Smashup Volatges Off 1 Side
« Reply #20 on: July 15, 2015, 06:19:02 PM »
Filament reg board, 1 X 4P1L  tube per side:
I  7.26V, 7.26V
O 4.26V, 4.21V

Regards,
Geary
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Offline Paul Birkeland

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Re: Smashup Volatges Off 1 Side
« Reply #21 on: July 16, 2015, 01:57:29 PM »
OK, so this convinces me that your regulator board is probably working OK.  Do you have more than two 4P1L's?  It's possible that one may be internally shorted somehow, and dragging the output of the regulator down?

Luckily, we have a current limiter on the filament regulator board, so you won't burn it up by loading it down too hard (but the delivered voltage will drop!).

-PB
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline galyons

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Re: Smashup Volatges Off 1 Side
« Reply #22 on: July 18, 2015, 07:23:26 AM »
Hi Paul,
I switched sockets with my original pair and the lower HV reg board voltages followed.  So, yes, maybe an issue with the tube.   I put in a new pair of 4P1L's, same HV & LV issues.  I tried my 3rd and final pair, all voltages are pretty much "spot on", other than +Reg A and the 4P1L heaters.  The 4P1L  filament regulator measured:

I = 7.1V
0 = 2.8V

The rest of the measurements at the boards are:

IA   180-220V  = 204V, 204V

OA  150V ± 1%  = 150V, 149.4V

+reg  (A side) 2.5V = 1.1V, 1.3V

IB   150V ± 1%  = 150V, 149.4V

OB  45-75V  = 53V, 57V   

Kreg (B side) 3-5V = 4.7V, 4.9V

Breg (B side) 150V ± 1%  =150V, 149.4V

+reg (B side) 150V ± 1%  =150V, 149.4V

Cheers,
Geary
VPI TNT IV/JMW 3D 12/FR1 MkII Soundsmith retip >Eros TH+ Otari MX5050 IIIB2 > Eros + Aurelic Aries ANK Dac2.1B > BeePre >Paramount 300B 7N7 > EV Sentry IV-A

Thorens TD124/Ortofon RMG-212/SPU >Seduction > Smash^Up> Paramour 45 MQ >K12's

Offline Paul Birkeland

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Re: Smashup Volatges Off 1 Side
« Reply #23 on: July 18, 2015, 08:02:51 AM »
It's possible that feeding the regulator board with mostly AC (from the disconnected capacitor) damaged the regulator.  It might be a good next step to replace the L200 chip.

-PB
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline galyons

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Re: Smashup Volatges Off 1 Side
« Reply #24 on: July 18, 2015, 04:34:27 PM »
Thanks Paul! That did it!  All readings in spec, (getting 4.1V out on the filament reg board ;D),  except  +reg  (A side) 2.5V = 1.1V, 1.3V, still low.    You haven't commented on the +reg  (A side) being low, so I am assuming it is OK?


I am still getting about 3-5mV of hum at the outputs. I will work on that in the next day or so!

Thanks for your help and patience.

Cheers,
Geary
VPI TNT IV/JMW 3D 12/FR1 MkII Soundsmith retip >Eros TH+ Otari MX5050 IIIB2 > Eros + Aurelic Aries ANK Dac2.1B > BeePre >Paramount 300B 7N7 > EV Sentry IV-A

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Offline Paul Birkeland

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Re: Smashup Volatges Off 1 Side
« Reply #25 on: July 19, 2015, 06:33:06 AM »
If you aren't getting 2.5V out of the 431 chip on one side, you can try replacing it. 

-PB
Paul "PB" Birkeland

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Offline galyons

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Re: Smashup Volatges Off 1 Side
« Reply #26 on: July 19, 2015, 07:59:59 AM »
If you aren't getting 2.5V out of the 431 chip on one side, you can try replacing it. 

-PB

Actually not getting 2.5V out on either board, (+reg  (A side) 2.5V = 1.1V and 1.3V).  Should I replace both?

Thanks,
Geary
VPI TNT IV/JMW 3D 12/FR1 MkII Soundsmith retip >Eros TH+ Otari MX5050 IIIB2 > Eros + Aurelic Aries ANK Dac2.1B > BeePre >Paramount 300B 7N7 > EV Sentry IV-A

Thorens TD124/Ortofon RMG-212/SPU >Seduction > Smash^Up> Paramour 45 MQ >K12's

Offline Paul Birkeland

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Re: Smashup Volatges Off 1 Side
« Reply #27 on: July 19, 2015, 08:29:13 AM »
What are you getting from OB on each board?
Paul "PB" Birkeland

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Offline galyons

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Re: Smashup Volatges Off 1 Side
« Reply #28 on: July 20, 2015, 10:53:17 AM »
Paul,
OB is 47V & 50V.

Cheers,
Geary
VPI TNT IV/JMW 3D 12/FR1 MkII Soundsmith retip >Eros TH+ Otari MX5050 IIIB2 > Eros + Aurelic Aries ANK Dac2.1B > BeePre >Paramount 300B 7N7 > EV Sentry IV-A

Thorens TD124/Ortofon RMG-212/SPU >Seduction > Smash^Up> Paramour 45 MQ >K12's

Offline Paul Birkeland

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Re: Smashup Volatges Off 1 Side
« Reply #29 on: July 21, 2015, 06:54:10 AM »
Did you cut out the HLMP diodes when installing your Smash-up?
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man