[Heath] SB-110 vs SB-110A

[Glen Zook]

Differences include:

Better filtering and bypassing.

Improved LMO.

Elimination of a spur from the heterodyne oscillator that was causing interference to television Channel 6.

The easiest way to tell the units apart is to locate V-9.  In the original SB-110, V-9 is located on the actual metal chassis and in the SB-110A this tube is located on the carrier circuit board.
 
The SB-110A manual calls for 6AZ8 tubes, not 6AX8!

http://tubularelectronics.com/Heath_Manual_Collection/Heath_Manuals_S/SB-110a/SB-110A%20Manual.pdf

 
Glen, K9STH


Website:  http://k9sth.com


________________________________
 From: George Babits <gbabits at custertel.net>
To: HeathKit <heath at puck.nether.net> 
Sent: Monday, April 22, 2013 9:50 AM
Subject: [Heath] SB-110 vs SB-110A
 

Can anyone tell me the differences between the SB-110 and the SB-110A. According to the front bezel, mine is an SB-110.  The manual I have is for an SB-110A.  I note that there are a couple of 6AZ8 tubes where the SB-110A manual calls for 6AX8 tubes.  Any other differences?

I spent a lot of time a couple of years ago trying to get this working.  As I recall, I had the receiver working very well but wasn't getting much out of the transmitter.  Finally think I have time to get back to work on it.
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