Page 55 voltage check wrong need help again.

Kurthaudio · 13768

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Offline Kurthaudio

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Reply #60 on: December 06, 2021, 11:48:39 AM
Ok I get OL resistance from 4 to the now open pads. OL on all of them individually. 
« Last Edit: December 06, 2021, 11:51:20 AM by Kurthaudio »


Offline Paul Birkeland

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Reply #61 on: December 06, 2021, 12:43:28 PM
Now do the same test on the loose ends of the wires that are no longer soldered in.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Kurthaudio

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Reply #62 on: December 06, 2021, 01:00:14 PM
393 red to 4
393 blk to 4

396 red to 4
396 blk to 4



Offline Paul Birkeland

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Reply #63 on: December 06, 2021, 01:36:53 PM
Could you post a picture of the bottom of the filament supply PC board?

Paul "PB" Birkeland

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Offline Kurthaudio

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Reply #64 on: December 06, 2021, 02:10:17 PM
Yup.


Offline Kurthaudio

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Reply #65 on: December 07, 2021, 07:05:27 AM
If I switch the 6.5vac coming off the transformer to the filament board the problem will follow. However I get 6.5vac on both sets with nothing connected????????


Offline Kurthaudio

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Reply #66 on: December 07, 2021, 08:33:16 AM
Problem solved. I have a AnTek AS-05T240 transformer laying around from another build. I removed the PT-9 6.5vac secondary’s and plugged in the AnTek………BINGO!!!!! Everything checks out now. Something is wrong with the low voltage windings of my PT-9 transformer………...



Offline Paul Birkeland

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Reply #67 on: December 07, 2021, 08:56:05 AM
Can you completely remove the filament PC board and show us what the wiring looks like on the transformer?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Kurthaudio

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Reply #68 on: December 07, 2021, 11:57:18 AM
Sorry I already removed the PT-9 and installed the AnTek and am listening to it right now.

I really like what I’m hearing! I have a little his/hum in between songs. Can’t tell if it’s tube rush or ground hum. Right now I don’t care this thing sounds beautiful!
« Last Edit: December 07, 2021, 12:03:52 PM by Kurthaudio »


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