[Bmotorcycle2003]

Roger, is there a way I can add two pots (one per channel) so I would be able to bias each tube independently.  I have over the years have had one tube go bad while its matched counterpart checks out fine.  I now have probably 6+ tubes that are not matched to any of the others so I really can't finish off using them.  If I were able to bias each tube independently I could than have the ability to use tubes after its mate has bit the dust. 

Again Roger thanks for this forum...............Bob

[Ericus Rex]

The new Stereophile review of the RM200 MkII states that Roger can add individual bias pots to this amp.  It's an $800 option when buying new, probably more expensive to retrofit.  Check out the review for more info.

[Roger A. Modjeski]

Rather than add separate bias pots I went with a "bias balance" pot as it makes adjustment easier. I can retrofit one for $900 including the driver mod and give the amp a full check-over.