Pumpkin preamp - ordered by Steen , official making thread - Page 349 - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 25th September 2013, 11:59 AM   #3481
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
no problem

decrease R19(a) accordingly - to have around 5mA through

if unsure - put 100R and measure voltage across it
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 25th September 2013, 03:13 PM   #3482
diyAudio Member
 
noSmoking's Avatar
 
Join Date: May 2010
Location: Texas
Hi Zen,
Are shunty boards available? or point me to a link to order.
Thanks,
NS
  Reply With Quote
Old 25th September 2013, 04:10 PM   #3483
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
will send PM
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 30th September 2013, 09:12 PM   #3484
diyAudio Member
 
noSmoking's Avatar
 
Join Date: May 2010
Location: Texas
Hi Zen,
Did you send PM ?
NS
  Reply With Quote
Old 30th September 2013, 09:17 PM   #3485
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
sorry , had stuffed PM box

done some cleaning and I'm gonna write
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 30th September 2013, 09:26 PM   #3486
diyAudio Member
 
noSmoking's Avatar
 
Join Date: May 2010
Location: Texas
hi Zen,
No worries take your time,lol. Would you point me to where this DC fix is ? I have built the pumpkin from your layouts,Waiting on a few Parts,lol. and what I'm going to do to power it,lol.
Thanks,
NS
  Reply With Quote
Old 30th September 2013, 09:34 PM   #3487
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
DC fix is still waiting ...... pretty much finished in LTSpice , but also pretty much not so simple .....

main reason for that issue being on back of list is fact that Pa's ( how dare he !? ) is also having caps ...... everywhere

, however good sounding it is , was just innuendo to next thing ;

that thing , not existing in this Universe , sometimes called as Ultrasymmetry ......



just chill - caps aren't harmful on that sole position
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 6th October 2013, 02:45 AM   #3488
diyAudio Member
 
Join Date: Feb 2012
Location: Stad Gemeente Batavia
hi ZM,
i have one pcs talema 2x55v 2x0.73A
can i use for stereo (2channel) pumpkin shunty ?

here the pic:
eIMG_20131006_093531.jpg

how to connect properly with the stereo pumpkin.?

thanks.
__________________
Aleph 30, Aleph P1.7, Pass F5, B1 Buffer, Aleph J, Pumpkin PreAmp, TDA1541 DAC
http://poshaudio.blogspot.com
  Reply With Quote
Old 6th October 2013, 09:11 AM   #3489
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
connect black+yellow , to establish center tap for 110V secondary ; confirm proper phasing connecting it to mains and measuring 110V across outer taps (red , orange)

if there is zero V , rotate one secondary

then connect CT to gnd on Shunty input side , outer taps to AC points

make bridges to same points on second Shunty

be sure to make proper ventilation in case , same as proper voltage ratings of caps on input side of Shunty (prior to Q2,Q2a) .... which means 110% x (55 x 1,41)

take care that Q2 , Q2a are heatsinked enough ...... and it's wise to use Irf610/9610 in their position
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 6th October 2013, 11:51 AM   #3490
diyAudio Member
 
Join Date: Feb 2012
Location: Stad Gemeente Batavia
my record is:
- it is save giving 110v into this shunty
- 2x0.73A is adequate for 2ch pumpkin+shunty
- using 9610+610 with larger heatsink
- caps prior to Q2 Q2a should be 100v minimum

So basically I am ready to fire on my pumpkin i guest.

Thanks again ZM.
__________________
Aleph 30, Aleph P1.7, Pass F5, B1 Buffer, Aleph J, Pumpkin PreAmp, TDA1541 DAC
http://poshaudio.blogspot.com
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



New To Site? Need Help?

All times are GMT. The time now is 10:01 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2