Pumpkin preamp - ordered by Steen , official making thread - Page 345 - diyAudio
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Old 21st December 2012, 09:07 PM   #3441
Zen Mod is offline Zen Mod  Serbia
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believe me - that cap is beneficial only if smallest one is used

ceramic is perfect , but use whatever you have in drawer

as I said - start from 1nF upwards

regarding visit to Italia .......... who knows ...... all roads are heading to Rome , anyway
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Old 21st December 2012, 09:19 PM   #3442
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Quote:
Originally Posted by Zen Mod View Post
believe me - that cap is beneficial only if smallest one is used

ceramic is perfect , but use whatever you have in drawer

as I said - start from 1nF upwards

regarding visit to Italia .......... who knows ...... all roads are heading to Rome , anyway
Ok tomorrow it will be the first thing I do.

I recently live near Milano,so you should consider the idea to visit the next TOP AUDIO nex September.

But this is an other story

Thanks and good night!

Last edited by tonimxp; 21st December 2012 at 09:27 PM.
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Old 21st December 2012, 09:40 PM   #3443
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moi despise FiFi fairs

ppl are what's important , when traveling
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Old 22nd December 2012, 01:21 PM   #3444
tonimxp is offline tonimxp  Italy
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Hello Alex! the stuff may you seem strange, but I tried using a 4.7 nF
and I got a result slightly inferior that obtained with 1uF.
Logically, I carried out an analysis of all the frequency range Hz kHz MHz and found that in the range of kHz 1uF gives better results than 4.7 nF.
So now i decided to leave 1uF.
Now i need a good layout cables assembly.
Please can you give me same good link or informations, if you prefer, also in Private Post.

Thanks
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Old 22nd December 2012, 03:40 PM   #3445
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send me info about selector and pot you're using
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Old 22nd December 2012, 08:17 PM   #3446
tonimxp is offline tonimxp  Italy
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Hi Alex i will use the input selector and volume control showed in pictures attached (red pcb).
I had to change a few things to be able to make it suitable for balanced use . I also have replaced its original pot with a four-way 10K Alps (much better than the original).
In this way i will get the same functionality of the input selector shown in the last picture more the possibility of remote control.
In the third picture the last pcb on the right will serve to keep the outputs to ground for a few seconds (about 10) to avoid bump input to the power amp.
What do you think of this device?
Attached Images
File Type: jpg IMG_20121207_093828.jpg (544.6 KB, 173 views)
File Type: jpg IMG_20121207_093845.jpg (574.6 KB, 164 views)
File Type: jpg IMG_20121207_153504.jpg (542.1 KB, 154 views)
File Type: jpg IMG_20121216_103421.jpg (823.4 KB, 154 views)

Last edited by tonimxp; 22nd December 2012 at 08:22 PM.
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Old 22nd December 2012, 09:33 PM   #3447
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having daisy chain of pcbs .......... make it in simplest way , but be avare that you must use one central gnd point (per channel) - either output side of Shunty , or input side of Pumpkin
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Old 26th December 2012, 10:00 AM   #3448
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Halo ZM,

I'm still have problem with 1 channel. I can't set output offset for - Out (-25V). + Out have no problem (5mV).
I measure VGS for Q5 2.7V, VGS Q6 9.3V.
My supply +/-30V.

Didiet

Last edited by didiet78; 26th December 2012 at 10:03 AM.
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Old 26th December 2012, 10:32 AM   #3449
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send me an email , possibly with few pics of that channel

>sasica5@gmail.com<
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Old 26th December 2012, 10:46 AM   #3450
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Hi Alex !I sent you in diy private mail a question about C5 aleph 30, please can you reply?
Thanks in advance

Antonio
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