Thank you Tony (and others) for the pointer to WD7S's web
page. That's the kind of web site I was hoping to find!
I'm interested in doing a power supply filter cap upgrade,
soft start mod and grid protection mod and he appears to
have all that covered.
While the tuned input board looks nice, I'm puzzled as to
why he doesn't supply it with the mica caps and inductor
wire if the application is known at the time of order.
Without variable inductors, how would you go about tuning
the system in-circuit? I guess you would need to tune it
out of the amp by simulating the tube drive impedance and
play around with various combinations of L and C until you
get a match; install it, and hope for the best? Time for a
call to WD7S.
Thanks, Bob
----- Original Message Follows -----
From: Bill Turner <dezrat1242@ispwest.com>
To: Tony King - W4ZT <amps080605@w4zt.com>,
amps@contesting.com
Subject: Re: [Amps] Building or Buying a Tuned Input Network
Date: Sun, 22 Jan 2006 20:14:34 -0800
> ORIGINAL MESSAGE:
>
> At 07:14 PM 1/22/2006, Tony King - W4ZT wrote:
>
> >Take a look at Paul's (WD7S) tuned input board:
> ><http://home.earthlink.net/%7Ewd7s/TU-6B.htm>
> >
> >73, Tony W4ZT
>
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> I considered that board but decided against it because
> nothing is adjustable except by soldering and unsoldering
> capacitors, or by adding/removing turns from the toroids.
>
> Tony, have you used this board? What are the instructions
> regarding tuning? Does it have a chart of suggested
> values for the silver mica caps? How close did it come to
> reality?
>
> Bill, W6WRT
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