[Heath] SB-110A

[G3OOU at aol.com]

In a message dated 23/04/2013 15:32:56 GMT Standard Time, kd2e at comcast.net  
writes:

Some of  the old Heathkit HP23's had a toggle switch on it to switch bias 
voltage.  ...Not sure if it was the 23 or 23A.
Newer ones did not, and had to be hard  wired. 
Just make sure you have the right setting for your  rig.




===========================================
Hi All
 
The HP23a and 23b had the toggle switch to select +250 or +300v, the HP23  
and 23c only had hardwired links.
 
The HP23 and 23a had a presettable negative bias on pin 11 of the PSU  
connector, the HP23b and 23c did not. On all four the fixed negative bias  
appeared on pin 1.
 
73

Bob

Bob F Burns G3OOU
C  Eng, FIET, MSE
G-QRP 6907
Secretary of Crystal Palace Radio &  Electronics Club: www.g3oou.co.uk
Technical web site:  www.qsl.net/g3oou
@BobFBurns on Twitter:  http://twitter.com/BobFBurns
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://puck.nether.net/pipermail/heath/attachments/20130423/87f4769e/attachment.html>