[ARC5] 2 RX in rack with p/s and FL-8 Filter being worked on

Neil Barnett neilba at clear.net.nz
Fri Oct 26 04:09:11 EDT 2007


>    B. It appears that the BFO has been removed from one of the receivers. 
> Which is a bummer.  Why would the original owner do that, I wonder?

Maybe in order to convert the triode (the beat frequency oscillator) of the
12SR7 to an audio stage, so as to lift the audio level supplied to the 12A6
output stage.  Some modders had the mistaken belief that the 12A6 alone
is incapable of supplying adequate audio for loudspeaker use.  Check to
see whether the 12SR7 has been reconfigured as an audio stage. It's easy
to reverse if you have the BFO coil can.

73 de Neil ZL1ANM



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