Aikido valve Preamp?

Hi all,

have anyone build Aikido Valve preamp, just want to share some experience and ideas on this Amp... :wink:

hi Bongcalifornia,

at the moment i am building the mono 9pin tubes preamp, still waiting for the power supply parts, basically, you need a 200-300v B+ power supply with 12.6 or 6.3 heater supply depends which type of tubes you are using in the circuit, Mr Broskies Aikido users guide is in website, that gives you ideas for power supply...

keith.

http://www.tubecad.com/2008/06/blog0142.htm

Hi,

Can anybody help, i have put together a dual mono Aikido Line amp, and a Lite LS57 & R80-53 transformer  (from diyclub), it works fine apart from the hum in the transformer, is it the main voltage  causing it to hum its 240V in UK, the trans primary voltage is 115-0-115, secondary is  
320-0-320, but the secondary voltage gone up to 350-0-350 will it cause problem too?

if i connect a power resistor series to the main before the transformer to lower the  ac voltage to 230V, which value of the resistor i need...

Thankyou

Keith

hi Accphoto,

thanks for replying my question,
the hum are not coming from the speakers, its coming directly from the transformer, most noticeable when just switch on, dont get me wrong its not a loud hum, only when there is no music on.
And for the earth connection i used the star earth method.


thanks