[SCCC] SB-220 Re-Build

[Steve]

At 10:30 AM 5/17/2019, Joe wrote:
>So been hunting for a design of another one, and have actually found 
>a ready to install one. from Ameritron.
>
>http://www.ameritron.com/Product.php?productid=EBS-1H
>
>They will sell me one, but will not provide any support because it 
>will not be going into an Ameritron AMP.
>
>They provide a downloadable schematic,,,, well kind of. it is of 
>such poor quality Very low contrast, and the resolution is soo bad, 
>by the time you enlarge a connection lead to learn what it is, the 
>name of the lead is un-readable.
>
>So I am looking for anyone that has used one of these in a SB-220 
>with the Harbach Meter board.

A hint: many of the boards from MFJ/Ameritron are actually their 
copies of somebody else's. For example, the Ameritron QSK-5 QSK 
switch is actually just a copy of the old Heathkit SBA-2001-1 QSK 
add-on switch for the SB1000 or similar amps; the schematics are 
nearly identical, parts values nearly identical, etc. Heath isn't 
around any longer to sue Ameritron for copying their original 
circuit, so who's to know? The schematic of the QSK-5 is OK but it's 
just the Heath schematic broken up into several disjointed and 
seemingly-disconnected pages. The circuit description of the original 
Heath unit is much better than the Ameritron explanation of their QSK-5.

It's highly likely the same is true of this "Ameritron EBS-1H" unit; 
so look at old Heath units or other manufacturers who are now dead 
and can't complain much about copyright infringement.

SteveH, K0XP