Pumpkin preamp - ordered by Steen , official making thread - Page 331 - diyAudio
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Old 8th January 2012, 01:28 PM   #3301
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Quote:
Originally Posted by jacco vermeulen View Post
A seasoned engineer with 30 years experience in building electronic circuits could have figured for himself a day ago that testing the sides of the Pumpkin for oscillation would have been easy peasy by taking either R9/R10 or R14/R15 gate resistors offline.
Part of the process is thinking for yourself.

The real engineering type would have measured each and every device himself before soldering, and tested every section of the circuit inbetween mounting on the board.
Old teach of mine said : trust is good, checking better.
Hard to communicate with someone who has total faith in the credentials, written by his own hand.

Worst case, you could have just asked someone to fix the boards for you.
Would have cost you P&P only, instead of the 10 Quid you charge for assembling DIY projects for others.
WTB: aleph pre-amp

Why are you so rude and abrasive ?

Why not just offer sound technical advice ?

Your comments about being PERFECT without any substantail evidence do you no favours.

I've admitted my failings.

I'm a systems engineer not an audio engineer.

The fault here has nothing to do with the construction, a point that you seem to miss.

Isolating either side of the amp has achieved nothing, something else that you have missed.

Caustic comments like "I am incompetent" don't bear well with your reputation.

I have repeatedly posted that Zen Mod thinks that is is a mis-match of components. Do I see any comments from you. NO.

Last edited by KatieandDad; 8th January 2012 at 01:33 PM.
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Old 8th January 2012, 01:31 PM   #3302
10y is offline 10y  Italy
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Originally Posted by KatieandDad View Post
We all reach our limits occasionally. I have accepted that the Pumpkins were too much for me.

Why are you constantly so rude and abrasive ?

If you have technical advice to offer then offer it.
KatieandDad,

there are no words referred to you in my post.

I'm here to learn not to teach.
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Old 8th January 2012, 01:34 PM   #3303
10y is offline 10y  Italy
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Originally Posted by KatieandDad View Post
Sorry - Picked up wrong quote.
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Old 8th January 2012, 01:44 PM   #3304
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Sorry about that. jacco vermeulen seems to have it in his head that he is brilliant, without offering any decent advice.

I picked up your post when I intended to pick up his.

Its all sorted above anyway.
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Old 8th January 2012, 07:33 PM   #3305
generg is offline generg  Germany
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one comment on the difference of pumpkin and B1 KatieandDad, for me the B1 is a bit more on the dark side.....can be pleasant or not

one of the best sound descriptions is here

B1 Buffer Preamp
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Old 8th January 2012, 07:51 PM   #3306
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Quote:
Originally Posted by KatieandDad View Post
The fault here has nothing to do with the construction
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.
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Last edited by jacco vermeulen; 8th January 2012 at 07:55 PM.
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Old 8th January 2012, 08:25 PM   #3307
Salas is online now Salas  Greece
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Quote:
Originally Posted by generg View Post
one comment on the difference of pumpkin and B1 KatieandDad, for me the B1 is a bit more on the dark side.....can be pleasant or not

one of the best sound descriptions is here

B1 Buffer Preamp
Did substantially better later with its special parallel regulators. Its still not as exciting as an analogous in attention large triode tube buffer non the less (IMHO). That one would cost 10 times more to make of course, takes heaters power, ages, and its a no no to beginners due to high voltage and inexperience in building with tubes.
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Old 8th January 2012, 09:03 PM   #3308
Zen Mod is offline Zen Mod  Serbia
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B1 is B1 , agree ;

making anything more complicated , especially with da toobz , isn't strictly matter of creating better , but more act of passion
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Old 8th January 2012, 09:19 PM   #3309
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Did substantially better later with its special parallel regulators. Its still not as exciting as an analogous in attention large triode tube buffer non the less (IMHO). That one would cost 10 times more to make of course, takes heaters power, ages, and its a no no to beginners due to high voltage and inexperience in building with tubes.
Is this your way of telling us less experienced members that it is not a good idea. I was thinking of DC6V6
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Old 8th January 2012, 09:21 PM   #3310
Zen Mod is offline Zen Mod  Serbia
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just go for it

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

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