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What's wrong with the kiss,boy ?
What's wrong with the kiss,boy ?
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Old 20th June 2016, 11:44 AM   #1
Zen Mod is online now Zen Mod  Serbia
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What's wrong with the kiss,boy ?
Default What's wrong with the kiss,boy ?

What's wrong with the kiss,boy ? ........ or - How I gained a gain ,little before Lee De Forest and little after Papa

lookie : Iron Pre | Zen Mod Blog

I already posted that link in few places here , but as it seems ,few Greedy Boyz are greedy for more info

cheap and clean way of having 6db (or little more ,with different gain device)

it's already everything written in that blog post , but to recapitulate :
-pot , then buffer of your choice , then 600:600 xformer connected as autoformer , voila! -there is 6db gain

if approach was good eons ago , when microfarrads and active gain devices were much more expensive than chunk of copper and iron,if approach is good for numerous mic input stages , if approach is good for F6 and especially M2 (buffer-autoformer-buffer) , it must be god for line stage too.

and yes , with 1+1 autoformer , Rout is four times Rout of buffer itself

xformers : Edcor have few , Jensen , Sowter, Lundahl etc.............

-do not expect that more expensive ones are necessary better sounding,
-do not expect maximum verity from buffer if you not use decent (shunt , my poison) reg.
-you can go wild and make your own autoformer , equipped with 24 taps , so skip pot on input and use autoformer at output, as volume attenuator and gain device ,as one device
-or you can make it this way - buffer -commercial AVC (200$ Slagle?)-output autoformer
-or you can go wild and connect commercial AVC to appropriate tap , as output autoformer and have 6db gain ...... that would be buffer -commercial AVC connected on proper tap

now I'm working on balanced Iron Pre ..... will post that soon too
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Last edited by Zen Mod; 20th June 2016 at 01:14 PM.
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Old 20th June 2016, 12:50 PM   #2
woody is offline woody
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What's wrong with the kiss,boy ?
Here is a cute idea to get 6db of gain from a buffer. Wonder if it would work with a B1 with a split supply ?
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Old 20th June 2016, 12:59 PM   #3
Zen Mod is online now Zen Mod  Serbia
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What's wrong with the kiss,boy ?
well , idea s that nothing is wrong with simple kiss , so no active gain stages

plenty of these in myriad threads around
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Old 20th June 2016, 06:14 PM   #4
Nelson Pass is offline Nelson Pass  United States
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What's wrong with the kiss,boy ?
We can take the foreplay as read....

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Old 21st June 2016, 12:35 AM   #5
wtl is offline wtl  Australia
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What's wrong with the kiss,boy ?
ZM, Would this work with a PASS B1.

Pot - B1 - Edcor wsm 600x600.

Steve.
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Old 21st June 2016, 02:18 AM   #6
2 picoDumbs is offline 2 picoDumbs  Australia
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I was going to make some smart ar5e comment about you and Jacco kissing at the burning amp festival, but I'll just keep quiet about that.
Haha
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Old 21st June 2016, 04:19 AM   #7
Chul is offline Chul  South Korea
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This could be a solution for old problems. I will try this with LDR+B1+Sowter 3575.
Thank you ZM.
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Old 21st June 2016, 07:12 AM   #8
Zen Mod is online now Zen Mod  Serbia
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What's wrong with the kiss,boy ?
B1,yes, but which iteration ?

in case of JFet buffer made of same sex JFets , that means double Rout comparing to complementary JFet buffer ....... and Rout is veeery important when feeding xformer with lowish inductance
I would double JFets to decrease Rout
in fact - I would put both JFets in parallel , and put bjt CCS down , no output foolproof resistor
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Old 21st June 2016, 07:13 AM   #9
Zen Mod is online now Zen Mod  Serbia
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What's wrong with the kiss,boy ?
Quote:
Originally Posted by 2 picoDumbs View Post
I was going to make some smart ar5e comment about you and Jacco kissing at the burning amp festival, but I'll just keep quiet about that.
Haha
naah

you're just jealous

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Old 21st June 2016, 03:17 PM   #10
Antoinel is offline Antoinel  United States
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What's wrong with the kiss,boy ?
Hello Zen Mod. Your final product is simple, and aesthetically beautiful. Bravo.
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