[Collins] Collins military S line

[Carl]

If I had a full run of the tube manual into the 70's Id use a 6EH7 RF, 6ES8 
as a Pullen mixer with AGC, 6DC6's in the IF and 6ES8's in the 2nd mixer and 
PD. Seperate AGC loops would handle the different tube curves. This model 
would have the highest

If I was stuck with tubes and circuits available during the different S Line 
production Id probably choose the 6BZ6 for RF, 12AT7's as straight mixers 
for early models then upgrade as better choices became available. Drake was 
smart to continually update the R4 series.

In all cases the B+ would be no more than 150V except the audio amp which 
would be a 6V6 or 6BQ5/EL84.

Carl
KM1H



----- Original Message ----- 
From: "Dr. Gerald N. Johnson" <geraldj at netins.net>
To: <collins at mailman.qth.net>
Sent: Monday, July 07, 2014 3:11 PM
Subject: Re: [Collins] Collins military S line


> So Carl, if you had the privilege of redesigning the S-line what changes 
> would you make besides relay control of the power supply primary and 
> filters that didn't ring so much? I would have changed at a minimum the 
> receiver IF tubes or added a third stage and worked over the audio output 
> to improve its efficiency and reduce that hot spot in the radio. I 
> probably would have wanted more common tubes than 6DC6 for the RF stage 
> too. I probably would have opted for circuit boards instead of Vector 
> turrets that were handy for assembly but a pain for maintenance.
>
> 73, Jerry, K0CQ, Technical Adviser to the Collins Radio Association.
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