Thanks, folks, for your discussion and links. I'll first try the
matched tubes listed at Antique Electrical Supply or RF Parts--that
would save me a lot of work and some expense. Of course, with these old
"classic" rigs, expense is not the prime consideration...

73, W9NPI
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afcsman wrote:
I have a Drake TR-3/RV3/AC-3 combo that did well for me in the 1970's.
It was designed for a matched trio of 12JB6 sweep tubes as the final
amplifier.
Obviously, these bottles are hard to find, and a matched trio even
harder. It's to a point where the current finals can't be neutralized.

Has anyone rebuilt the final amp section with currently available tubes,
such as a pair of 6146's? I'm open to try something like that, since
the rig is still in fair shape, had good audio "punch," and could
probably have its selectivity improved by an audio DSP program.

I'd appreciate the benefit of your knowledge and experience.

--afcsman