What is the advantage of the second tube? Would the original power supply
handle the additional current requirements to drive the second tube to full
potential?
Thanks,
Doug - N9XTF
Quoting Paul Christensen <w9ac@arrl.net>:
> "Years ago the Alpha 77Dx was manufactured with one 8877 tube and a square
> plate that could be removed to add a second 8877, making a 77Sx...."
>
> Yes, I own one with the plate still intact. Back in the early '90s, I was
> also considering the purchase of the 87A as an alternative to the 77Dx.
> While talking to Ray one day, he conveyed all those issues, including 160M
> inefficiencies which may have gone to the point of the doorknob caps.
> Anyway, after my discussion, I was convinced that it was just a trick to
> foster new hardware sales. There's more money to be made on the sale of a
> new amp than in the sale of some parts. But there seems to be some truth to
>
> his assertion, although I'm still happy with the 77Dx purchase some 15+
> years later.
>
> For several reasons, I've never considered adding the second 8877 to the
> amp. For one, I would much rather troubleshoot an amp with one tube, versus
>
> two.
>
> Paul, W9AC
>
>
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