[Amps] SB220 Odd problem: UPDATE

[Carl]

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 at gmail.com>
To: <amps at 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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