[Heathkit] Help S meter circuirtry

[Edward B Richards]

Wally;

There was a service bulletin put out by Heathkit re this problem. It
seems if V3 and/or V4 become gassy, the G1 goes positive and causes the S
meter to go negative. Measure the G1's with a VTVM and if positive,
replace the tube(s). They recommend GE tubes only. Good luck.


73, Ed Richards K6UUZ
AMI member #1534

On Sat, 9 Apr 2005 20:02:50 -0400 <w1ioo at cooledge.com> writes:
> I am working on restoring an HW-101. The s meter reads negative 
> scale. The
> meter zero has no affect. Could someone explain how the circuitry 
> for the s
> meter works so I can trouble shoot it. If I understand how the 
> circuit works
> then I think I can figure out the problem. Thank you in advance.
> 
> W1IOO 
> 
> Wally
> 
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