[Amps] Heath SB220 Zener Replacement

[Robert B. Bonner]

The cathode of the diode string goes towards the cathode of the tube.

The 5 diodes would ZENER at about 3 volts.

I'd rather use a 5 volt zener.  I think Radio Shack carries some NO WATTAGE
Zeners  Put 5 of them in parallel.

BOB DD

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Jay Musikar
Sent: Wednesday, November 01, 2006 3:26 PM
To: Amps at contesting.com
Subject: [Amps] Heath SB220 Zener Replacement

I am currently restoring a SB220 and the 1N3996 Zener
(ZD1)has been physically removed from the amp.

It is apparent that the previous owner was not neatest
individual in the world, so I have my work cut out for
me.

It is my understanding that this Zener can either be
replaced with another one or with a series of silicon
diodes in lieu of a another 1N3996.

1.  What is the configuration of the silicon diode
substitution?  As I recall it was done by substituting
five (5) diodes in series in place of the Zener.

2.  Do any of you have a schematic for the mod...If so
please scan it and send it via email to:

af2c at arrl.net

Thanks in advance es 73,

Jay/AF2C



 
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