Pumpkin Preamp - Perfect for F4 - Page 76

Zen Mod · 5th June 2011, 01:43 PM

what gain you need from

?

3GGG · 5th June 2011, 09:56 PM

Not sure, I am not that smart or knowledgable, still learning.

Amp's are Aleph J's which are nearly finished.

Out of interest the complete system will be as follows
Diy Slate and acrylic TT
MY TT build
Dl103R Cart

HPS 5.1 Phono
Hps 5.1

Pumpkin

Aleph J's

4 Way horns
Fane 8m, 200hz LeCleach
Yamaha 6681b 400hz LeCleach
Fostex T500A MKII
Bass TBA

I hope to avoid digital X-Over so am looking at Passive line level for X-Over.

jacco vermeulen · 6th June 2011, 04:00 PM

Quote:

Originally Posted by 3GGG

I am not that knowledgeable - Diy Slate and acrylic TT - HPS 5.1 Phono

Could have fooled me.

3GGG · 6th June 2011, 09:50 PM

Quote:

Originally Posted by jacco vermeulen

Could have fooled me.

My skills are best used on the hands on building part. The technical side is where I am laccking and slowly learning.

So what gain should I set Pumpkin to and how do I go about working this out.

Cheers

Zen Mod · 6th June 2011, 10:59 PM

set Pumpie for - say - 4x gain

meaning - input resistors in range of 15K , feedback resistors in range of 62K-68K

3GGG · 7th June 2011, 01:01 AM

thanks again Zen:-)

tonimxp · 14th January 2013, 09:15 AM

Quote:

Originally Posted by Andy5112405

Here's my Shuntky / Pumpkin Stereo Pair

All I can say is ABSOLUTELY STUNNING

The GREEN GROUND wire that you see at the top left was experimental during build, it was eventually tidied away but connected to the IEC socket instead of the screw hole used in the photo.

Zen-Mod is wonderful and very helpful, I had a few problems which were quickly and easilly resolved. That is the DIY spirit.

Incidentally the two transformers were not used, one for each channel. I just happened to have 2 x 50VA 20-0-20V Transformers which were perfect for 40-0-40V use.

Hi Andy and good year !Please why did you use that connection between the heatsink and chassis? You've got yourself a problem of background noise initially? It seems to me that by touching with my hands sinks the noise varies, please could you give me some advice?

Thanks in advance

Antonio.

5th June 2011, 01:43 PM	#751
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	what gain you need from ? __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

6th June 2011, 10:59 PM	#755
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	set Pumpie for - say - 4x gain meaning - input resistors in range of 15K , feedback resistors in range of 62K-68K __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

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5th June 2011, 09:56 PM	#752
3GGG diyAudio Member Join Date: Mar 2010	Not sure, I am not that smart or knowledgable, still learning. Amp's are Aleph J's which are nearly finished. Out of interest the complete system will be as follows Diy Slate and acrylic TT MY TT build Dl103R Cart HPS 5.1 Phono Hps 5.1 Pumpkin Aleph J's 4 Way horns Fane 8m, 200hz LeCleach Yamaha 6681b 400hz LeCleach Fostex T500A MKII Bass TBA I hope to avoid digital X-Over so am looking at Passive line level for X-Over.

7th June 2011, 01:01 AM	#756
3GGG diyAudio Member Join Date: Mar 2010	thanks again Zen:-)