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[AMPS] Tuned Input Circuit Board

To: <>
Subject: [AMPS] Tuned Input Circuit Board
From: (carl seyersdahl)
Date: Wed, 11 Jul 2001 20:26:10 -0400
>From reading the msgs. on tuned input ckt. boards, I would infer that there
is/are/were amps which used relays (dip) to switch tuned ckts on the input
side. I'm not at all familiar with    the majority of amps out there. Can
someone enlighten me on this subject?? It has the earmarks of something I
might be interested in while I'm in the amp rebuilding mood.thanks to all.
   carl / kz5ca
----- Original Message -----
From: "Pete Smith" <>
To: <>
Sent: Wednesday, July 11, 2001 11:34 AM
Subject: Re: [AMPS] Tuned Input Circuit Board

> At 10:33 AM 7/11/01 -0400, Tom Rauch wrote:
> >
> >> 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.
> Can we infer from this that replacing the 10 and 15m relays with something
> beefier (for example, the NAiS/Aromat relays used in the Top Ten relay
> boxes) would lead to a reliable input system?  The price is sure right at
> ~$2.00 each...
> 73, Pete N4ZR
> No, no ... that's WEST Virginia
> --
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