[Vintage-Radio] Radio Craftsmen C550 amp questions.

[Paul DeFayette]

Good evening all,

I had the the good fortune of aquiring two Radio Craftsmen C550 ultra =
linear amps over the last year.  Are they the same as the Craftsmen C500 =
amps, except for the addition of the 5NO03 time delay relay?  If not, =
what are the differences?  Is there any difference in audio quality =
between the two?  I still have to check them out and recap where =
required, etc.  Both of mine came with 6L6's instead of the KT66 =
outputs.  Is there a noticeable difference worth upgrading to the KT66 =
tubes?  Which are recommended by the group, especially of the new =
production?  I thank one and all in advance for any help you can =
provide.  Also, I would like to purchase a xerox copy of the original =
Radio Craftsmen owner/operator manual and service manual for these amps, =
if anyone has them available to copy.  Happy New Year to everyone.

Best regards,

Paul DeFayette

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