[MRCA] BC-348 S-meter modification query?

[D. Platt]

On 2/19/2014 1:47 PM, Ray Fantini wrote:
> The official CQ Surplus conversion handbook has the S Meter installed  in the screen grid of the second IF amplifier, a circuit that works surprisingly but others had used a 6C4 for inverting the AVC voltage that not quite as good. The S meter in the IF screen is very similar to what they used on the old HRO receivers. Another place where the 6C4 was used frequently is as an audio voltage amplifier to drive the audio output tube but I have found that after changing the audio output transformer to one with a low impedance secondary that there is plenty of audio using the stock circuit. Have also seen the same thing done with 6SN7 tubes. Don't know if it will go thru but will attach a picture from the CQ Surplus conversion manual.
>
> Ray F
>
>
Ray,  Thanks for that kernel of good info.  I'll look things up and see 
what's about.  I'm 99% certain that the 6C4, in this case, is for the 
meter as it (the meter) is hooked up with dividers between the plate and 
cathode of the 6C4.  What I've not traced back yet is where the grid is 
tied to.  What I hope is, is that its merely a vestigial hook-up such 
that I can simply remove the added components and proceed from there.  
I'll let you all know.

The diagram came through fine.

Jeep - K3HVG