Pumpkin Preamp - Perfect for F4

[mpmarino]

for other gredy boyz :

What is gredy?

leds are in fact IR ones,mounted on front panel,so I can tweak standing current with remote

International Rectifier makes RF sensitive diodes?

 

[Zen Mod]

What is gredy?



International Rectifier makes RF sensitive diodes?

 

[Magura]

So you don't know?


Magura

 

[Zen Mod]

So you don't know?


Magura

 

[flg]

What is gredy?

International Rectifier makes RF sensitive diodes?

So you don't know?

Magura

Hey, I work there and I don't know???

 

[lykkedk]

Thanks.... I will go for Yellow one's, as they are more pumpking like , thoose leds i found will use 5mA at ~1,9v !

ZenMod Thanks for reply's... I just forget : I see in earlier thread that you like the pumpkin to be attennuated at input, so i can use a normal alps stereopot, and short -in to gnd as usual with such's circuit's... ??? Are there any reason to use 4deck attenuator with no balanced sources ???

Anyone have a quick mockup of a -+36vdc supply with torrid size and all ???? - Just for testing (I do not plan to make shuntreg's right now)

Jesper.

 

[Magura]

Anyone have a quick mockup of a -+36vdc supply with torrid size and all ???? - Just for testing (I do not plan to make shuntreg's right now)

Jesper.

Take a look at the BOZ article....it's got all the info you need, there's even a PCB layout. All you gotta figure yourself is the zener value.


Magura

 

[lykkedk]

Yep Magura zen...

I know... Just trying some sim... with a 2x40vac torrid

Jesper

 

[Magura]

Yep Magura zen...

I know... Just trying some sim... with a 2x40vac torrid

Jesper

2*40V should be fine....I didn't really pay attention to the fact that you need a negative supply as well, in that case you should use the BOSOZ PSU board design instead.

....but don't you already have a BOSOZ? In that case all you gotta do is to adjust the zener string and fit the 2*40V trafo


Magura

 

[lykkedk]

Magura

....but don't you already have a BOSOZ? In that case all you gotta do is to adjust the zener string and fit the 2*40V trafo

I need another psu, not the one sitting in my bosoz...

A 40vac x2, 610 / 9610 + zenerstring of 41v with 2,5mA running through + 10000uF smooties and a load of 2A on both - and + rail, simulates fine, so i think i will try that out one at the next day's.

Jesper.

 

[Magura]

Ohh, you have little faith in the pumpkin, so think the trusty BOSOZ will be needed in the future....


Magura

 

[lykkedk]

no comment's here...

 

[mpmarino]

.

 

[Zen Mod]

.

ugly!



sound,now?

 

[mpmarino]

a little bit

 

[Magura]

OK, go back to sleep Marc!

Magura

 

[mpmarino]

OK, go back to sleep Marc!

Magura

But I just woke up!

Seriously. Quick test - bass bins full range/ 22uf and couple ohms on 902 driver/ both sides in parallel on junky Technics receiver 1 channel. This, my friends, is not an optimal set up


OH BOY! attack, speed, dynamic, and come pretty close to sounding real good. I think they'll tweak into something special.

 

[Zen Mod]

according to thread's title

But I just woke up!

Seriously. Quick test - bass bins full range/ 22uf and couple ohms on 902 driver/ both sides in parallel on junky Technics receiver 1 channel. This, my friends, is not an optimal set up


OH BOY! attack, speed, dynamic, and come pretty close to sounding real good. I think they'll tweak into something special.

ya don't need F4 to drive that drek
make with beafier opt stage and drive them directly

 

[mpmarino]

Is this what your sending to Burningamp?

 

[Zen Mod]

Is this what your sending to Burningamp?

nope - I'll send plain dreky preamp...

with beafier version I'll play when I receive first official pcbs

say , twice 25V and 1A Iq

nothing else than plain mirrored Aleph x,what else......... nothing new under the sun

is it worth ?