Pumpkin preamp - ordered by Steen , official making thread - Page 338

Itsmee · 12th February 2012, 09:32 AM

Hi BKsabath,

These are the transformers I bought for my Pumpkin, not too expensive

Buy Chassis Mounting Transformers Frame mount transformer,75VA 2x50V o/p RS 10-5879 online from RS for next day delivery.

Bksabath · 12th February 2012, 10:30 PM

Tanks Itsmee

I belive AC V rated X 1.471 = 73 V DC
100V capacitors then.

Bksabath · 13th May 2012, 08:51 AM

It has been A long time since last post

I got a Shunty working fine yesterday the other just wont have it.
I have most probably messed up the PCB when desoldering components for the third time.

I am going to start and probably bench test Pumpkin today.

Questions
What gain you use for F5?
I am thinking 4 may be the best compromise so R5 R6 at about 47K
As those are about 1/2 then C1 C2 = 10P ?

Zen Mod · 13th May 2012, 09:39 AM

yup

Bksabath · 13th May 2012, 01:00 PM

TA

13th May 2012, 09:39 AM	#3374
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	yup __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

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12th February 2012, 09:32 AM	#3371
Itsmee diyAudio Member Join Date: Feb 2009	Hi BKsabath, These are the transformers I bought for my Pumpkin, not too expensive Buy Chassis Mounting Transformers Frame mount transformer,75VA 2x50V o/p RS 10-5879 online from RS for next day delivery.

12th February 2012, 10:30 PM	#3372
Bksabath diyAudio Member Join Date: Dec 2007	Tanks Itsmee I belive AC V rated X 1.471 = 73 V DC 100V capacitors then.

13th May 2012, 08:51 AM	#3373
Bksabath diyAudio Member Join Date: Dec 2007	It has been A long time since last post I got a Shunty working fine yesterday the other just wont have it. I have most probably messed up the PCB when desoldering components for the third time. I am going to start and probably bench test Pumpkin today. Questions What gain you use for F5? I am thinking 4 may be the best compromise so R5 R6 at about 47K As those are about 1/2 then C1 C2 = 10P ?

13th May 2012, 01:00 PM	#3375
Bksabath diyAudio Member Join Date: Dec 2007	TA

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