10pf 1Kv SM Shane or you can use a 5KV RF doorknob as those are often
cheaper since no one has a use for such a low value. It goes between 40-20
right at the switch.
For the switch use brass hardware, I buy bulk at a local hardware wholesaler
but hobby shops also have it.
Carl
KM1H
----- Original Message -----
From: "Shane Youhouse" <kd6vxi@gmail.com>
To: <amps@contesting.com>
Sent: Thursday, May 12, 2011 10:45 AM
Subject: [Amps] SB220 Odd problem: UPDATE
> Finally got down to brass tacks on my SB220 (ie, got enough done to where
> I had some time).
>
> Grid current I meter would read 30 mils, keyed, NO tubes. Read the value
> of the .82 ohm shunt, its 33 ohms. New one on the way.
>
> Also replaced every finger on the bandswitch. #2 hardware works fine for
> those interested. MUCH better tuning. Removed HALF the turns on the 10
> mtr input, put a 120pf cap on in and out, 65 watts on 10 now gives 700
> out.. Centered the new input on 26.3, gives a nice broad coverage of 12
> and 10, under a 2, WELL under a two to 1.
>
> I'm also going to replace the HV shunt resistors, and increase the amount
> of resistors by two, in order to lower voltage impressed upon any one
> resistor. Bleeders all checked out.
>
> Rewiring the CT to prevent smoking fil xformer will be done when I put the
> resistors in... Any other mods? Grids are already directly grounded.
>
> Carl, whats the value of the SM you put from 80 to 10? I DO NOT want to
> replace those fingers again! LOL...
>
> Once this one is finished, time to add some screen voltage to the 4-1000
> in the rf-103.... Pulled out the Lambda supplies, tired of stubbin the
> toes! LOL
>
>
> Transistors have ratings, tubes have guidelines!
>
> --Shane
> Kilowatt Delta Six Victor Xray India
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>
>
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