[Amps] SB-1000

[Carl]

Is that into an antenna or a known 50 Ohm dummy load?

As long as it tunes from 3.5 to 4.0 I wouldnt worry. The tuning point is 
fixed by the LC of the tank circuit.

Carl
KM1H

----- Original Message ----- 
From: "Joe Frank" <jfrank002 at neo.rr.com>
To: <amps at contesting.com>
Sent: Wednesday, August 27, 2008 2:01 PM
Subject: [Amps] SB-1000


> Built my SB 1000 about 10 to 12 years ago but was travelling a lot and 
> used ALS 500 in motor home so SB 1000 has had little use.
>
> Initial start up was normal except for one quirk.  Resonant point for 
> plate variable capacitor is WAY OFF on the dial as compared to 80 
> meter dial mark. At 3875 instead of pointing at the 80 meter mark 
> (maybe 80% meshed) it resonates near the center of the dial ( maybe 
> 30% meshed) just to the left of the 40 meter point.
>
> Have double checked construction details many times and have given up 
> on finding the problem.
>    Doorknob caps---labeled value in proper place and connected to band 
> switch as instructed. Also checked all details of connection of coil 
> L-8.
>    Control knob and pointer are attached and oriented to the capacitor 
> position  as instructed.
>
>    The 40, 20, 15 & 10 meter circuits are normal with normal pointer 
> position.
>
> The amp works OK and serves my needs as is but I am not comfortable 
> with it since it is not normal operation and I would not want to sell 
> it in this condition.
>
> Could you speculate as to possible cause of this problem. My first 
> guess was too much fixed capacity in the circuit but I have no 
> equipment to measure the actual value of the doorknobs.    Have 
> considered replacement in case they are mislabeled. Would sure 
> appreciate any comments you could make about this problem.
> Thank You
> Joe M Frank WA8JOE
> jfrank002 at neo.rr.com
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>