Pumpkin preamp - ordered by Steen , official making thread

[jacco vermeulen]

Night vision goggles to look at wet clams in the dark.

www.youtube.com/watch?v=FN9aS4m9tnI&feature=related

 

[generg]

sorry jacco,

Dieses Video enthält Content von WMG. Es ist in deinem Land nicht mehr verfügbar!

was all I could see from the video at youtube....

 

[jacco vermeulen]

I-view-it, scrw the War Brothas.

(the link was a jokey meant for the Zen Moister)

 

[generg]

all clear, Zen Master where are you..........



Please write us a message without using a PC or let us hear your voice on the monitor or.....

 

[Zen Mod]

speaking of youschmuck - this one is most important these days

YouTube - Tribute to Japanese Shoya Tomizawa Pilot killed in accident on September 5, 2010

 

[jacco vermeulen]

Reminds me of 19, by Paul Hardcastle.

 

[generg]

dear Zen Mod,

Is it possible to make the symmetrical wiring from the XLR to pumpkins input by close drilling all three cables together or must I buy shielded symmetrically cable?

Because Babelfish 2 has 20 db amplification I care now more for the hum, that was not so hearable with F4.

Of course also in the output stage, I try to optimize the mass points and cables.......

 

[Zen Mod]

dear Zen Mod,

Is it possible to make the symmetrical wiring from the XLR to pumpkins input by close drilling all three cables together or must I buy shielded symmetrically cable?

Because Babelfish 2 has 20 db amplification I care now more for the hum, that was not so hearable with F4.

Of course also in the output stage, I try to optimize the mass points and cables.......

did you altered down Pumpkin gain ?

you can use shielded cable which you're using for your RCA lines - one shielded per phase

 

[generg]

Yes changed gain, sounds very good now combined with babelfish

So the cables for the + and - must not be a twin cable with a common shielding, they can be separated and have their own shielding.

O.k. I will try!

 

[generg]

Hi Zen Mod,


I forgot when I decrease R5/R6 in Pumpkin I have to increase C1/C2 .....correct?


best for you!

 

[Zen Mod]

naah ..... leave them as is

except in case that you have CRO and can look at rectangle

buzz/hum solved ?

 

[generg]

too late I already doubled them...

Yes! I have CRO at school a and I will look for the rectangle at .......? kHz?

 

[Zen Mod]

naah ...... just chill

either with nice beer or nice wine , listening da muzak

who cares for little ringing here and there ....... if at all

 

[generg]

Chilling...? I will do when I am old!


I went to school, took the oscilloscope and looked first time on the different waveforms with Pumpkin. Was very interesting..... No overshot at all! Not even at 100kHz!

Now I can chill indeed ........

 

[Zen Mod]

chill means be cool/enjoy/relax ..... at least in ZMEngrish

 

[Zen Mod]

So - seems that I have my Paypal sorted , at last ;
There was/is one glitch - I was given by mistake with Maestro card , instead of Visa - so I was unable to to lift Paypal limits for money withdrawal .
Anyway , just yesterday I manage to solve that , and I'm expecting Visa plastic to arrive in 10 or so days , then I'll be able to lift limits and transfer any amount to bank account .

Paypal account is active , withdrawal is just matter of time .
New batch of pcbs is ordered and they'll be at my bench also in 10 days or so ; other parts are in drawers , including matched mosfet outputs .

You can reach me for this on >greedyzenmod@gmail.com<

please include Pumpkin in subject

then I'll give you more details

Cheers !

 

[birdyman]

I want to build pumkin to drive my Aleph mini(30w chipamp PCB). I am a lo-fi , put pretty colors in my music kind guy. I want to have volume and tone controls in Pumpkin. Does pumpkin have enough gain to handle tone control circuit or should I increase gain? ( please dont flame me for this, this may have been discussed before, but I could get passed 500 post)

 

[Zen Mod]

is made to drive balanced F4 , so it have enough gain

how you'll include tone stack - don't know right now , just because I mess with tone stack ages ago , so I forgot everything

do you know by chance - what's insertion loss of your (passive ? ) tone network ?

 

[generg]

What a nice address .......

"You can reach me for this on >greedyzenmod@gmail.com"

 

[birdyman]

:

do you know by chance - what's insertion loss of your (passive ? ) tone network ?

Sorry, no clue, it sounds some Greek to me. May be I need to take some on line electronic college classes first to monkey with amps. I just have limited knowledge on electronics and dumb ears too. Can you suggest a tone control mod??