Pumpkin preamp - ordered by Steen , official making thread - Page 332 - diyAudio
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Old 8th January 2012, 09:21 PM   #3311
Salas is offline Salas  Greece
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Best idea is each one's dream and strive. Nobody should harness for anybody else.
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Old 9th January 2012, 09:34 PM   #3312
10y is offline 10y  Italy
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Hi,

finally tested my two pumpkie board one by one with music in a balanced out setting first with Up ampli ( test failed because speakers protection is always activated even if diff. offset is around 1-2-mV after caps) and after in an unbalanced output setting with my aleph 30.

In this configuration sound is present but is covered by a very loud noise like hum that seems a ground loop effect.

1)All current and voltage tests are ok.

2)Tryed to distance boards from trasfos without effect.

3) Wired all input and output as usual in my others pre hum-free.

4) Rca ground are isolated from chassis.

5)Changin' simple wire with coax wire don't produces variations on the noise level.

6)tryed boards with ugs-low voltage supply: always noise.


This pre is a very challenge for me but with your help I will win on it.

Ciao,

Anto
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Old 9th January 2012, 09:37 PM   #3313
Zen Mod is offline Zen Mod  Serbia
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pictures , please

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Old 9th January 2012, 10:03 PM   #3314
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Quote:
Originally Posted by Salas View Post
Best idea is each one's dream and strive. Nobody should harness for anybody else.
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Originally Posted by Zen Mod View Post
just go for it

best way for learning something is ...... to start to learn

Well said my dear mentors. Will have to wait though, the queue is already full of other wonderful things. Perhaps next week.
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Old 9th January 2012, 10:15 PM   #3315
10y is offline 10y  Italy
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some last tests pics:
Attached Images
File Type: jpg DSCF0173.jpg (498.1 KB, 270 views)
File Type: jpg DSCF0174.jpg (584.5 KB, 262 views)
File Type: jpg DSCF0175.jpg (377.2 KB, 256 views)
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Old 9th January 2012, 10:19 PM   #3316
Zen Mod is offline Zen Mod  Serbia
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wait 'till tomorrow , from two reasons :

- to cool your head
- to have a sun , or proper external light source for pictures

in a meantime , I'll try to find few wiring sketches I made long ago ...
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Old 9th January 2012, 10:28 PM   #3317
10y is offline 10y  Italy
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Worked about six hours around it without results.You are right, I 'm so tired.
It's time to sleep.

Ciao,

Anto
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Old 9th January 2012, 11:37 PM   #3318
jimbo51 is offline jimbo51  Australia
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Quote:
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in a meantime , I'll try to find few wiring sketches I made long ago ...
This?

Click the image to open in full size.
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Old 9th January 2012, 11:43 PM   #3319
Zen Mod is offline Zen Mod  Serbia
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Old 10th January 2012, 04:53 PM   #3320
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Quote:
Originally Posted by jacco vermeulen View Post
Aleph P1.7
470nF 100V Capacitor - 0.10 : Quarndon Electronics

Your "Orange Drop" C3 carries the old Philips logo.
Buying old NOS parts for $0.15 each can be OK, provided one measures them.
You're welcome to call them the best.

Me has a very old piece of paper in the closet that reads Mil-Spec soldering certificate, could be the reason i'm rude and abrasive.
Other than that i'm a total idiot.

I've sold them now, they're off to America.

As I said, Zen Mod did state that it might be a component mis-match but no-one at the time could offer any advice.

I'm a systems engineer. To me one 0.1uF cap is the same as another until you so called "experts" tell me otherwise.

I'm now playing with my B1, which works absolutely perfectly, just trying to "Brighten" it up a bit.

We are currently at the stage of playing with the 10uF output caps. I've got all manner of caps here from Mundorfs to Chinese Audiocaps.

I'm getting a lot of suggestions which is VERY VERY useful.
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