[Amps] Tuned input board on SB-220

[Bob Maser]

It works FB in my Henry 4K Ultra too.  It even showed me that I had a bad 
coax connector on the output of the amp because it started to retune 
everytime the connection would arc.  As soon as I repaired the connector, it 
went back to normal operation.  Great addition to the 4K Ultra.  Next comes 
the replacement of the 8877 by a 3CX1200D7 for huskier grid and no warm up 
time.

Bob W6TR
----- Original Message ----- 
From: "k7rdx" <k7rdx at charter.net>
To: <garyschafer at comcast.net>; "'noddie'" <noddie at comcast.net>; "'Ed Dial'" 
<diale at mindspring.com>; <amps at contesting.com>
Sent: Thursday, March 23, 2006 2:09 AM
Subject: Re: [Amps] Tuned input board on SB-220


> The LDG module works FB with my YC-156 AMP...Output waveform looks much
> better than with untuned input,however it might taks a shoehorn to fit
> inside the Heath amps or at least some re-positioning of components.My
> connection to the YC-156 cathode is seven inches from the tuner board and 
> it
> provides an acceptable input match anywhere I tune...And fast too.Jim
> K7RDX..
> ----- Original Message ----- 
> From: "Gary Schafer" <garyschafer at comcast.net>
> To: "'noddie'" <noddie at comcast.net>; "'Ed Dial'" <diale at mindspring.com>;
> <amps at contesting.com>
> Sent: Wednesday, March 22, 2006 8:22 PM
> Subject: Re: [Amps] Tuned input board on SB-220
>
>
>> There was some discussion on this board awhile back and wasn't it decided
>> that the tuner is actually an L network and not a PI? That would make it
>> unsuitable as a tuned input network.
>>
>> 73
>> Gary  K4FMX
>>
>>
>> > -----Original Message-----
>> > From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com]
> On
>> > Behalf Of noddie
>> > Sent: Wednesday, March 22, 2006 10:10 PM
>> > To: 'Ed Dial'; amps at contesting.com
>> > Subject: Re: [Amps] Tuned input board on SB-220
>> >
>> >
>> > The AT-100AMP is what I am going to use on my SB-221, I wish it had 
>> > been
>> > around when I build a tuned input board for my Clippertron L, all the
>> > other
>> > tuned input boards do not work on the WARC bands and cost 150 dollars
>> > compared to 125 dollars for the AT-100AMP and this board is automatic
> with
>> > memories.  The only thing you will have to watch out for is that your 
>> > RF
>> > choke does not resonate on the WARC bands.  I changed my choke to the 
>> > RF
>> > Parts one at a cost of 25 bucks, it works for 3-500's and 572b's and
> will
>> > not resonate on the WARC bands.
>> >
>> > Mike
>> >
>> >
>> > Gentlemen,
>> >
>> > I need opinions from the experts that live here. I have an SB-220
>> > that does an excellent job on the pre-WARC bands, however it doesn't
>> > like 12 and 17 meters very well, thanks to the tuned input circuit
>> > from what I understand. I noticed that the good folks at LDG
>> > Electronics is now selling a stripped version of their AT-100
>> > autotuner as the AT-100AMP, marketed as an RF amplifier tuned input
>> > board for homebrews and the like. My question is, could this board be
>> > fitted into the SB-220 without much pain? Would this solve the WARC
>> > problem?
>> >
>> > If so, would it work in the SB-200 as well? I have no clue with 572s.
>> >
>> > Lazy and looking for the simple way out -
>> >
>> > Ed
>> > WA4RYW
>> >
>> >
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>>
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