2 x 12au7 amp running on 9 volt adaptor and smps

[amptramp]

I may end up using two smps one for pre and one for power. I will use split supply and caps etc. I hope it doesnt hetrodyne again. thats annoying. I muy run 3 12au7 in the power section though. will have to see if I can run that much ma with the 9 volt walwart. may have to use a 16 volt...hmm....the fun of it all 

Save yourself a socket and run a 12BH7.  It has a bit higher maximum anode voltage and power handling capability and can be used right down to 12 volts on the plate if needed.  (I have a design somewhere for a 12 VDC grid dip meter using a 12BH7.)  It is also less likely to be considered an "audiophile" tube, so pricing is reasonable.  The only disadvantage is double the heater current.

As for not heterodyning, you either have to synchronize it or use just one supply.  Hope is not part of the recommended design process.

[zambo]

That just makes me mad at hetrodyning  I might try the bh7 thing too. I mostly just want to see how far I can go with a 9volt walwart ampwise.

[iccaros]

Zambo, did you see that smps I posted that with the changes at the end of the document put out 125ma ?

[zambo]

I saw it i just have no idea how to build it. Tubes i am passable with. anything else I usualy have a harder time making it work. It looks like i will have to get better at it though...

[iccaros]

I am thinking of ordering some PCB, I have an eagle layout.. If I can get a good price I'll send you one to test..

[El Heisenberg]

Great little amps. I dont wanna let these designs go so im bumping em. I used both amps for this recording. Its to cassette tascamm 488 but it sounds ok

http://dl.dropbox.com/u/4685682/new.mp3

[zambo]

Cool sound clip El !! Thanks for sharing!