[SCCC] SB-220 Re-Build

[Joe]

Now many folk are confusing the QSK unit with this Bias unit. they are 
two different items.

Joe WB9SBD

On 5/17/2019 2:36 PM, Steve wrote:
> 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
>
>