Quote:
Originally Posted by Alastair E
Wasn't long before a bright spark came up with a way to use a standard Horiz O/P Bipolar Transistor in place of both the PSU and Horiz-Out GTO's....
Involved changing the Drive Transformer for a type used with Horiz-Output Transistor, and deleting the original GTO drive circuit.
A BU508A was used quite successfully to sub the SG GTO with the alterations to drive it right by replacing the drive transformer by me for a number of these repairs, and was a good reliable conversion.
On a few of the earlier conversions, I retained the SG in the PSU (as I had sill a few around) and just modded the horiz-out stage. I kept one of those early ones for may years and no further trouble from it.
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That must be the mod I heard a passing mention of. Where can I find instructions on how to do that?
10-16-2015, 02:07 PM
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