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 STC 549 Radio schematic
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 Return to top of page · Post #: 16 · Written at 11:29:09 AM on 22 June 2021.
Telftn's Gravatar
 Telftn
 Location: Wallan, VIC
 Member since 21 June 2021
 Member #: 2452
 Postcount: 9

Got it. Many thanks again.
 
 Return to top of page · Post #: 17 · Written at 9:03:30 PM on 25 June 2021.
Marcc's avatar
 Marcc
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 5389

I would support the STC Circuit issue. Copped a chassis 59 that had been hacked, even the HRSA could not find a circuit & STC only used it in one model.

I ended up restoring the hacked bias chain as per a 58a I think (recorded) found a factory lead dress issue and ended up reducing the bias on IF 6D6 (aka 6U7) to stop it overloading the plate detector (that in conjunction with an Oscilloscope).

I drew up the circuit I ended up with & sent it to HRSA & Kevin Chant, with appropriate warnings on changes, & how the circuit was derived.

Marc
 
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