Pumpkin preamp - ordered by Steen , official making thread

[tomtt]

3500

 

[wengtech]

Just finished all boards.
Fire up, nothing smoked, all are good.
Measuring Vout at shunty +/-20v

VR not working, nothing happen turn left or right
Vout still the same no changes.

IRF using 610 and 9610
All other component according to BOM

Can someone explain why?

Thanks.

 

[Zen Mod]

send me pictures at mail , to leave too much traffic of forum

did you made everything by the CookBook , including use of resistor load for setting ?

with pictures send me also data for xformer

it must be some methodical mistake , judging that you have low and same voltage on both rails

>sasica5@gmail.com<

 

[wengtech]

Hi zm
Sending all pics.
Yes all according to cookbook.
R load are 500R 5watt.

Tried to replace 4R7 from AC inputs (into jumper)
Still the same no changes with VR turn left or right.

 

[aterren]

Zen Mod - any chance you sill have PCBs available?

 

[Zen Mod]

yup

PM replied

 

[Bksabath]

Just finished... (sorth off) my Pumpkin today.

Tomorow rest and enjoy

 

[Zen Mod]

wakoo Irishtalian

 

[ori0nzbelt]

Are boards still available?

Seems I'm late to the party...

I need pumpkin in my life!

 

[Zen Mod]

yes , they are

I'll catch up with my PM's in day or two ......

 

[ori0nzbelt]

 

[albertNL]

I finally started sorting parts for my Pumpkin and Shunty.
Is the 100uF capacitance for C10 and C10A (Shunty schematic in Pumpkin Cook Book) critical or can I use the 82uF/25V that I have in my drawer?

 

[albertNL]

Also, I have 12uF. Can I use these instead of 10uF for C9 and C9A (Shunty)?

 

[Zen Mod]

just go for it , nothing critical , both questions

 

[albertNL]

Thanks Zen Mod, will do.

 

[albertNL]

Pumpkin boards nearly done. Shunty is next

 

[Zen Mod]

are those different LEDs ?

I really had intention to keep cascodes at 6x 1V93

ok voltages aren't so critical , but green ones are good in noise department

 

[albertNL]

I only had 6 green 3mm leds left. The yellow measured the same voltage (1.94V) using a component tester so I assumed they would be ok.
Leave the yellow in or replace by 5mm green leds?

 

[Zen Mod]

naah

leave them in

 

[albertNL]

Thanks Zen Mod.