[Heathkit] SB-310 Modifications

[Chris Trask]

    I'm once again considering making modifications to my SB-310.  A year or
so ago, I tried replacing the 6BZ6 RF Amp with a 6GM6 for better gain,
noise, and linearity.  However, in some bands it liked to oscillate.  When
not oscillating, the modification provided much better gain and noise and I
would like to return to this tube as a replacement.

    I don't want to use the 6HS6 even though there was quite a bit of
interest in it.  It's an expensive tube and reportedly had a short lifetime.
There's little advantage to using the 6CB6 except if you're operating in the
transition region, which is very unlikely.

    Anyone know of a published modification using the 6BZ6?

Chris

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