Is there a burn in time for a new board [all new resistors, capacitors etc]. I put all new metal film resistors, new quad cap, new Solens' on a new 7199 board. And now I "wait for the warm sound". Not saying it sounds bad, it's just not "warm" mmmm?

Hi Bob, it's a Tube Dreams St-70 board. Identical to the old layout using 7199 tubes etc. Not worried about the board per se' - because all that is differnt really is modern components. In fact the old board worked fine and sounded better.....LOL
Just doing all round "upgrading" but left at the basic layout. Used the same tubes I had on the old board yesterday....

It might mellow a bit over time, but going from the original carbon comp resistors and paper capacitors to metal film resistors and polypropylene capacitors is always going to sound different from the way it did originally. What you have now is probably how it will remain for the most part.

To get the sound a bit warmer, you might try carbon film or carbon comp resistors with paper in oil capacitors. Actually, I have heard that Auricap polypropylenes are a bit warmer than your average film cap.

Thanks for that Bob, I kinda suspected the sound would be differnt. And that is in part the purpose of my experimentation with the various ST-70's I have.
Question - and I do have some Auri Caps coming - are the .047 the actual output caps or all 4 caps the .01 and the .047 comprise of output caps.
Much appreciated

Mike

My apologies Peter, I did not pay attention to the author. Not enough coffee yet....LOL
It was a typo on the mdf vaules as well. So to clarify your response - the .10 are the coupling caps and .047 are the output caps?...am I reading that right?

Ok Bob thnx.
I will post my thoughts on the various cap options.

thnx again

Mike