SB-104 (A?) help

Robert Nickels ranickel at MWCI.NET
Mon Jul 20 23:55:11 EDT 1998


I've been working on an SB-104 which according to Penson's book should come
as no surprise.  There are no markings that this unit was upgraded to
SB-104A but I've found several areas where wiring differs from the 104
schematic.  Does anyone know what the changes were to upgrade a 104 to a
104A?

There is a sticker indicating this rig went back to Heath for servicing in
1987.  Would the factory have done the upgrade?  And if so, wouldn't they
have identified it as having been done?

If anyone has experience with the 104 and wouldn't mind dropping me an
e-mail I'd appreciate a second opinion.  Thanks for any help!

73, Bob W9RAN

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