[HBR] Product Detector

[DW Holtman]

Hello,

I have a question that I hope that someone can help me with.  I'm 
looking to build a Product Detector for a R-390A receiver. The R-390A 
has a BNC connector on the back with the If of 455 KHZ coming out. What 
I want to do is build a quality detector in a chassis that will mount in 
a standard 19 inch rack. The mechanics I can handle. What I'm looking 
for specifically is

1.  Tube gear.
2. Built in AGC circuit, with at least 2 time constants, ie; fast and 
slow as well as MGC using manual RF attenuation (pot).
3. At least 2 maybe as much as 4 If stages for better selectivity.
4. Don't know yet is it is better to use cans or crystal/mechanical filters.
5. Don't need a high power audio amp, will feed audio back onto the 
R-390A and use the onboard audio amp.

What I'm looking for is a construction project from an old ARRL handbook 
or QST article for a quality receiver. I will only use the If strip and 
the detector and low power audio amp. If anyone has any suggestions on 
what year handbook/'QST might have something promising, please let me know.

Thank you in advance for any information.

73's
DW Holtman
WB7SSN