[Collins] Early 75A-4 rejection switch question

[AI2Q]

Thank you, Joe.

I was able to inspect a late model 75A-4 today, with serial number in the 
3000s, and it has the same switching scheme as my S/N 489, as you point out.

Now that repairs and alignment have been completed, I moved the receiver 
from my workbench to my shack, and I'm enjoying it.

Vy 73, AI2Q, Alex


----- Original Message ----- 
From: "Joe Eide" <jeide at execpc.com>
To: "AI2Q" <ai2q at roadrunner.com>
Cc: <Collins at mailman.qth.net>
Sent: Monday, August 05, 2013 5:14 PM
Subject: Re: [Collins] Early 75A-4 rejection switch question


>I would say all of them Alex.
>
> Joe - KB9R
>
> On 8/5/2013 12:05 PM, AI2Q wrote:
>> My 75A-4, which I have recently repaired and restored, has an early 
>> three-digit serial number. My question has to do with the Q-multiplier. 
>> The Rejection Tuning knob switches the filter in and out; the OFF 
>> position engages a silver tab that touches what looks like a small 
>> contact on the front facing portion of the filter can.
>>
>> Is this switching scheme something common to all 75A-4 receivers, or just 
>> the early ones?
>>
>> Any comments much appreciated.
>>
>> Vy 73, AI2Q, Alex
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