[Heathkit] SB-1000

Sun, 8 Feb 2004 10:53:23 -0500

  Hi Charlie,

  Subbing in a string of diodes will work but its poor
engineering practice, bias regulation will be considerably
poorer. After replacing the zener, I would also suggest
placing a 20-50 ohm 50 watt wirewound in series with
the B+ to the 3-500, and place a back to back pair
of parallel connected diodes across the meter movement.
 Diodes are cheaper than meters.

73,  Mark  WB8JKR

On Sun, 8 Feb 2004 09:27:26 -0600 Charles W BWW Burkhardt
<[email protected]> writes:
> Gentlemen; I have a Heath SB-1000 amp which is giving me some 
> trouble.
> The  7.5 volt Zener has gone bad, along with some components on the 
> meter
> board. Someone had sent me information years ago about substituting 
> 10 1
> amp rectifying diodes in place of the Zener. Does anyone have 
> experience
> with this mod. Unfortunately I didn't save the original notes. 
> Thanks.
> 
>         Charlie, K0GPF
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