[Amps] Harbach metering board in SB-220

[Carl]

Ive had many of those boards fail due to the 1/4 W metering resistors used. 
Last I heard Jeff was going to come out with an update using real HV 
resistors.

The tiny 1N4007's used in the bias are also failure items and I replace with 
1N5408's along with the resistors before installing. Those were also to be 
updated for the new board.

The switch can be replaced with any of several of the import single pole 3 
positions or more. If the detent in degrees is the same the knob will line 
up and just dont use the other positions. If there is a position tab bend 
one to stop at 3.

Carl
KM1H




----- Original Message ----- 
From: "Pete Smith N4ZR" <n4zr at contesting.com>
To: <Amps at contesting.com>
Sent: Friday, March 07, 2014 7:14 AM
Subject: [Amps] Harbach metering board in SB-220


>I am trying to understand a minor problem in my SB-220, which otherwise 
>works fine.  I originally installed the Harbach board because the HV was 
>reading low.  It fixed that, but quite quickly thereafter the HV metering 
>failed.  I *think* the relative power metering failed at the same time, but 
>can't remember for certain - a common cause is puzzling because I can't see 
>any commonality between the two circuits.
>
> Can anyone help me identify components that are likely responsible?
>
> -- 
> 73, Pete N4ZR
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