Atma-Sphere MA-1 tube rolling

@crowdaddy2

Insofar as I know, the best way to find a failed tube is trial and error:  you should have a second full set on hand anyways.  If replacing all the tubes doesn't work, send back to manufacturer for check-up.  Ralph and Atma-Sphere will be glad to evaluate the problem.  I don't think anyone can really tell you what the problem is without physically evaluating the unit.  

Best wishes!

I swapped tubes between sides until I got a good null on each unit.  As advertised, the M-60s do sound great:  most noticeable immediately was better localization of sound sources. 

Will take a gamble on some $20-a-pair jugs from Ukraine; perhaps if I precondition them they will last a while.
Am thinking of building a uTracer:  https://www.dos4ever.com/uTracer3/uTracer3_pag0.html
Very clever tube curve tracer, over 1800 built so far.

I had good luck with Ken-Rad VT231's in my MA1s. Cheers,
Spencer