valviac.com -> audio/diy ->
(click photo to see pdf - ~111kB)
... hmmh yeah in the long run I managed to publish that little jewel.
Just now - waiting to drive to a friends 50th birthday - I decided to finish the web publishing.
The circuit is based on the famous EURiDICE circuit of Ciro Marzio, Cristiano Jelasi & Luca Chimenti.
Just do a google and you'll find several different versions of the design.
Mine is a based on a C3g "Deutsche Post" Pentode wired in Triode connection.
What shall I say - this is a real KEEP IT SMALL AND SIMPLE approach and sounds wonderful.
This time I didn't document the power supply.
Just take a look at the power supplys for the "30somethang" and "Der BaRBaR" and recalculate it,
so that ~150V are dropped at the RC filter stages.
I did it the same way with R's & C's I had at hand.
Heater supply is 6.3V= without any VOODOO.
By the way - the 30's on the chassis in the photo above are only for decoration :-)
(The C3g is a bit ugly - at least if canned)
Have a nice weekend
Update: June 7th.
Tried LED bias - and it suits me better.
Since it's no big deal - neither wallet nor soldering - test it yourself.
Feel free to contact
me, if you have any questions, suggestions, comments etc.