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Old 25th October 2007, 12:15 AM   #11
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Quote:
Great, please make a Package A+ , which include the additional FETs.
I second that.
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Old 25th October 2007, 01:06 AM   #12
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by dviswa
Oops, I forgot to ask another question. The forum does not let me edit posts beyond 30 minutes.

ZM,

What is the output of this preamp and at what load impedence?

Thanks,
Dinesh

in this moment I don't have few things:

1. papers with measured data for output impedance ; they're maybe even in trash

2. working Pumpkin ; mine was just in prototype (ugly mess ) ; first pair of main boards (populated ,tested ) were on BAF ; I didn't have time to make another one , yet ;

after finishing BAF main boards , I received few days after Shunty boards and I have time just for assemblage and final testing of just one . so - I'm two main boards and one Shunty away of full Pumpkin

but......... I can answer you pretty satisfactory - you can squeeze nearly 65Vpp (46Vrms) from Pumpkin output ;

slightly decrease R13 and R18 ,increase 10x C4 and C5 , and you can probably drive whatever earcans you have ...........

good enough ?

even if I cleverly avoided to give you any number .............
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Old 25th October 2007, 02:26 AM   #13
dviswa is offline dviswa  United States
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Quote:
Originally posted by Zen Mod
slightly decrease R13 and R18 ,increase 10x C4 and C5 , and you can probably drive whatever earcans you have ...........

good enough ?
Even an AKG K1000?



You really keep interesting times, ZM. I was totally surprised to see your post at this time. It was after 9 PM Eastren time when I posted it.
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Old 25th October 2007, 02:58 AM   #14
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by dviswa


Even an AKG K1000?



You really keep interesting times, ZM. I was totally surprised to see your post at this time. It was after 9 PM Eastren time when I posted it.

so what ?
now is 0503 in the morning here ..........

well - I tried my K270 Studio on Pumpkin with their 55 ohms impedance

I heard just slight loss in bass (with output caps of just 2 x 4u7) but I haven't impression that is running out of steam ....

maybe because my test proto setup was with 250VA donut and 2x 30.000 uF...

but- AKG 1000 ?

yes- with doubling Iq , at least .

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Old 25th October 2007, 05:38 PM   #15
RKH is offline RKH  United States
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Default overkill transformer for shunty

i found this a plitron... it might be up to the task

http://www.plitron.com/shopping/shop...=Surplus+Stock

scan the page for a couple that are ~82V ct.


ryan
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Old 25th October 2007, 08:18 PM   #16
Zen Mod is offline Zen Mod  Serbia
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well , I'm not related to Steve in any way ( except that I just adore surplus places and junkyards ; even if I don't have any surplus place around me ,and have never enough junkyards around me) , but I think that Apex Jr. is good place for asking

anything what will result in (twice) 58 to 70Vdc will be adequate

AR2's biggie xformer for quickie bird nest is from Apex Jr.

dirt cheap even for my cheapskate habits .........

well ........ I don't have link handy - if someone is interested , he can see pics in BAF thread...... and Steve's site is HERE


EDIT:

and , yes - EI xformer is always better for preamps than donut , or anything else
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Old 27th October 2007, 12:04 AM   #17
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Default The Shunty BOM and schematic file

HERE
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Old 1st November 2007, 05:33 PM   #18
dviswa is offline dviswa  United States
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Thanks RKH. I ordered the overkill transformer.
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Old 1st November 2007, 10:43 PM   #19
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Default Re: The Shunty BOM and schematic file

Quote:
Originally posted by Zen Mod
HERE

later in thread first and second CookBook for
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Old 2nd November 2007, 12:44 AM   #20
RKH is offline RKH  United States
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Quote:
Originally posted by dviswa
Thanks RKH. I ordered the overkill transformer.

You're welcome. The one I ordered is due in tomorrow.
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