[Boatanchors] Collins 75A-1 Mod info?

[Geoff]

Forget what I said about the 6AH6 prior, wrong oscillator.
The 6AH6 is capable of a higher signal level which is required to make the 
7360 work as well as possible.

Carl
KM1H


________________________________
 From: Roger Shultz <nj2r at verizon.net>
To: boatanchors at mailman.qth.net
Sent: Thursday, February 9, 2012 9:16 AM
Subject: [Boatanchors] Collins 75A-1 Mod info?

I'm working on the restoration of a reasonably good condx 75A-1 that has a
couple mods which I have yet to find any documentation about.

The front end has been changed to a 6BZ6, the mixer is a 7360 and the HF
oscillator is now a 6AH6. The first RF amp has a 6SG7 in place of the 6SK7
though I don't see any socket changes there.

The second mod is the addition of a fast/slow AVC switch neatly mounted to
the right of the Phone jack.

I'm inclined to leave well enough along though the s-meter does not seem to
work as it should however I have yet to check out anything about why that
may be.

I've seen mods for the 7360 mixer for the 75A-4 and suspect the front end
6BZ6 which is close to the 6DC6 may be a copy of that in the 75A-4. I've
searched Electric Radio, on line, Collins archives etc but have found
nothing close so far. Has anyone seen this before?

The really good thing about this radio is that is has the 353C31 mechanical
filter which is not very common as I recall.

Thanks for any info you may have.

73, Roger, NJ2R

______________________________________________________________
Boatanchors mailing list
Home: http://mailman.qth.net/mailman/listinfo/boatanchors
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Boatanchors at mailman.qth.net

List Administrator: Duane Fischer, W8DBF
** For Assistance: dfischer at usol.com **


This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
______________________________________________________________
Boatanchors mailing list
Home: http://mailman.qth.net/mailman/listinfo/boatanchors
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Boatanchors at mailman.qth.net

List Administrator: Duane Fischer, W8DBF
** For Assistance: dfischer at usol.com **


This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html


-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 10.0.1424 / Virus Database: 2112/4798 - Release Date: 02/09/12