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Realistic TRC-457 direct inject

Posted: Tue Oct 16, 2018 12:14 pm
by Goldfinger
This is for the Realistic TRC-457, TRC-458, TRC-449, President Washington (2 button 858 chassis) or Madison (858 chassis), Robyn SB-510B, SB-520D, Cobra 138XLR, Cobra 139XLR direct injection.

Change C82 to a 2.2uF mylar, polyester film, polypropylene or non-polarized electrolytic. You can also use a polarized electrolytic if you install with the positive towards TR22's collector.
Change C84 to a 2.2uF. 25volt electrolytic, observe polarity.

Inject through a 2.2uF mylar, polyester film, polypropylene or non-polarized electrolytic. You can also use a polarized electrolytic if you install with the positive towards TR22's emitter. Inject at the junction of TR22 emitter and R100.


858 direct inject.jpg
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