quick question on alembic f2-b

[bent]

can it run on 282v instead of the 300v   

cause i use a hammond 266l24 transformer in reverse (12v to 234v), and i dont get the 234v on the ac output...

I use the same schematic of moosapotamus:
http://www.moosapotamus.net/IDEAS/F2B/alembic.htm

the guy at hammond wrote me that when using their transfo in reverse, you loose some voltage, and write to put a little more voltage to compensate the lost....but i'm not certain to test it cause i dont want to blow the transfo ($$)...can it be put on 15vac to 17vac without blowing?

so i have 2 solution:
run on 282v 
or push the voltage to compensate 

suggestion ?
Bent

[gtudoran]

Run it @ 280V... should not be much difference.

Best regards,
Gabriel Tudoran
Analog Sound

[bent]

Thnak's i will try that ! 

by the way... if a transfo can convert 12v to 234v, how much more can it take (can we put 13v-14v ?) there must be like a % of error that it can support before blowing ?

bent

[PRR]

• Do you think your audience will laugh you off stage until you come back with another 18V?
• All audio tube-work is +/-20% at best. Wider variations often do not matter.
• The Alembic is the front-end of a Fender guitar amp.
  Fender worked this scheme with anything from 240V to 410V, whatever was handy.
  It will "work" down below 200V, but by 150V the sound on guitar/bass may be too "colored" for general "clean" use.
  It will work up to 470V supply and the tubes will still be within 330V ratings though the 100K plate resistors should be at least 1/2 Watt. There's no good reason to go so high.
  Try to be above 200V and probably not over 400V.

> how much more can it take (can we put 13v-14v ?) there must be like a % of error that it can support before blowing ?

Maybe not much. Maybe not enough to be worth the risk. Small PTs at 60Hz are "probably safe" 20% over. 20% is not going to turn you from a bum into a hero. Smoke on stage WILL get you booted out.

[bent]

THANK'S FOR THE REPLY....

EVER HAD THOSE MOMENT WHEN YOU FEEL IDIOT !!!!!!
FIRST TEST WAS 24VAC ON THE SERIES TRANSFO....GETTING 265VDC ON THE MOOSEPOTAMUS POWER SUPPLY SCHEMATIC...
SECOND TEST WAS 9VAC (DELVERING 12VAC) ONTHE PARRALLEL .... GETTING 282VDC....
I JUST REALIZED THAT I WAS USING ON THE FIRST TEST A 20VAC ( DELIVERING 22VAC) ADAPTOR ....CHANGE IT FOR 24VAC AND NOW IS PERFECT !               

WELL I POST IT IN CASE SOMEONE HAVE THE SAME PROBLEM OF ME AND DID NOT VERIFY THE ADAPTOR...
IT'S LIKE WHEN YOU BUILD A STOMPBOX , TEST IT AND YOU HAVE NO SOUND....SPEND TIME SEARCHING TO FIND OUT THAT THE CABLE WASN'T PLUG INTO THE GUITAR...

BENT