[ARC5] Product detectors - the name.

[K5MYJ]

This page say the 75A-4 was manufactured in 1955:
http://www.rigpix.com/collins/75a4.htm

The National NC-300 (1955) and NC-303 (1958) have what appears to be a product detector (6BE6). The first grid is the LO, and the third grid is the IF input. The plate of this tube is the detector output.

Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
  ----- Original Message ----- 
  From: Dennis Monticelli 
  To: Kenneth G. Gordon 
  Cc: K5MYJ ; ARC-5 Maillist 
  Sent: Thursday, May 11, 2017 3:53 PM
  Subject: Re: [ARC5] Product detectors - the name.


  According to Osterman's book, the 75A-4 was introduced in 1958 and the NC-109 was introduced in 1957.


  Dennis AE6C


  On Thu, May 11, 2017 at 3:03 PM, Kenneth G. Gordon <kgordon2006 at frontier.com> wrote:

    On 11 May 2017 at 14:27, K5MYJ wrote:

    > I just checked the manuals for the Collins 75A-3 and 75A-4.
    >  
    > The 75A-3 was sold as an AM/CW/FM receiver. The 75A-4 was sold as an AM/SSB/CW receiver.
    >  
    > The 75A-3 did not have what we now call a product detector.
    >  
    > The 75A-4 had both diode(AM) and product(SSB/CW) detectors.
    >  
    > To me the 75A-4 is the first receiver I know of to be designed for SSB.

    Did that pre-date the National NC-109?

    Ken W7EKB

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