[Boatanchors] difference bet. 75A3 and A4?

[Jim Wilhite]

Well Todd, I have never been a fan of stock any receiver built much after 
1960.  Collins was in the forefront of developing SSB and seemed to 
introduce narrow receivers before anyone so I suspect that is what was going 
on with the A2  Any of the National, Hammarlund, Hallicrafters or others pre 
1960 could adopt this scheme to the same effect and the audio would sound 
bad even though most of those had good audio sections.

So considering Collins was narrowing the IF, why bother with bodacious audio 
sections.  It just makes engineering and cost sense.  I have heard an A4 
and, to me, it sounds just like any 2.4-2.8 kc receiver with a filter, and 
for communications audio that is sufficient.

But my thought was the A1 was designed and probably built before this drive 
to lower bandwidth started, so there might be significant differences in the 
audio section.

Giving winter is coming on for you, take care of that first.  And secondly, 
don't go to a lot of trouble.  The question came about as a result of your 
post and is more for information than anything else.  Watch that "sickness" 
too.  It might just be like the permanent flu.

73  Jim
W5JO

----- Original Message ----- 
From: "Todd, KA1KAQ" <ka1kaq at gmail.com>
To: "Jim Wilhite" <w5jo at brightok.net>
Cc: <boatanchors at mailman.qth.net>
Sent: Wednesday, October 19, 2005 3:20 PM
Subject: Re: [Boatanchors] difference bet. 75A3 and A4?



> I probably should have added 'in my opinion' to that statement because
> I recall some folks in the past who think the A-1 sounds awful too.
> There have been folks who say the 75A-2 is the 'best' AM receiver of
> the A-Line, but I can't confirm this by mine. Maybe they had the
> broader versions? I wonder when or even if they started this narrowing
> process in the A-2 before adding the filters and renaming it the A-3?
>
> Rather than say more off the top of my head, what I can do is bring
> both manuals in to work and see about copying the pertinent
> information for you. With all the rain we've had I'm behind on just
> about everything at home but I'm still sneaking over to pick up
> another transmitter from a friend tonight (it's a sickness, for
> sure!). I've still got your address here so I can send out the copies
> to you when time permits.
>
> I can tell you that I picked up the 75A-1 last February or March and
> it still had all of the original KenRad tubes installed, and with just
> a chunk of wire on the back and the 270G speaker attached, it sounded
> great - better than any of the others, but the A-4 isn't as bad as you
> might think.
>
>