Just a suggestion: If I were you I would not do anything with it until after tracing it through on the schematic. Have you done this type of tracing before? If you can get the rigs schematic and then trace the wires attached to the control to the components they go to, the group will be able to help much more. Better yet take a pic with your cell phone or something, email it to me and I will post it to my website for you and they can see it, that might help you even more. Bob AD5VJ
_____ From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] On Behalf Of Ken Stutts Sent: Thursday, November 19, 2009 7:50 AM To: drakelist@zerobeat.net Subject: [Drakelist] Mystery Modification to Drake TR-4 Recently became a new Drake TR-4 owner via eBay. Got lucky and the radio appears to be in pretty good shape. Purchased a Turner +3 mic to go with it and fixing to go through the radio cleaning switches, pots, relays, etc to try and get her in top shape. Got a fan to do a mod with that on the finals. First lesson Mic plug is not a ¼ plug Ha! Ha! So muddled through that one. Here is my question . When looking at the radio from the front, on the left side, towards the bottom of the cabinet, there is a pot with a knob, that is adjustable and has a off (I assume) position. It is labeled, by an owner Max and Min. In receive, it appears to have no effect. I havent been able to place the unit in transmit yet to see if it has any effect there. I know the info here is sparse . But I figured some of you guys that have forgotten more about these radios than I will ever know may have a clue as to what this mod is . If not, when I take her apart Ill try and trace it down and see where it goes . Geez, this radio sure sounds good .. Thanks in advance for any help . Ken KB4MUV
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