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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.<br>
Newer ones did not, and had to be hard wired. <br>
Just make sure you have the right setting for your rig.<br>
....Dave<br>
<br>
<br>
<div class="moz-cite-prefix">On 4/23/2013 9:51 AM, George Babits
wrote:<br>
</div>
<blockquote cite="mid:DF1C89AF93884687A2F7FA0AAA823FA5@GeorgePC"
type="cite">Just a quick thanks to all who responded regarding the
differences between the SB-110 and SB-110A. I now know that mine
is an SB-110A. The confusion on the tubes (6AX8 vs 6AZ8) looks
like it was a miss-print in the manual I have. Now if I can just
get it transmitting properly. I have an HP-23 in a SB-600 speaker
enclosure so can use the proper power supply instead of my "bench"
supply. Maybe that will make a difference in the performance.
<br>
<br>
Thanks and 73,
<br>
George
<br>
W7HDL
<br>
<br>
<br>
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