In addition to the below, most of the after-market tuned input
boards I have seen have relays that are too small for the job.
They were marginal @ 100 watts, but the newer higher output
transceivers will zap them with ease! Caveat Emptor!
(((73)))
Phil, K5PC
Subject: Re: [AMPS] Tuned Input Circuit Board
> > FAR Circuits is offering up a copy of the Tuned Input
> > Board made for the Dentron GLA-1000B amplifier. It
> > may be a good way to install a Tuned Input into other
> > amps. I have some of them and have found them to be
> > excellent boards and very well made.
>
> Amp supply and Dentron always had trouble with DIP relay failures
> in the ten meter position of that board when used for heavy CW
> use, like contesting. This was especially true with tubes having a
> lot of input capacitance or low driving impedances.
>
> Other than being unreliable with high duty-cycle ten meter
> operation, and an occasional problem on 15 meters, the boards
> worked quite well.
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