[Collins] 75A-4

Hi Collins gang

I recently bought a real oldie but a wonderful piece of equipment.  It is a 75A-4 serial number 1591.  I wish to find out the following:

1.  Is  there a product detector mod. which is worth while to change to and if so can someone please provide circuit details

2. I need to add a 4:1 tuning  knob and would appreciate advice on source and cost.

73 and seasons greetings

Vidi, ZS6AL

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