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I found that the majority of problems was with the connectors on the mother board. Pull all boards and clean the connectors, dry joints were also a problem on both the mother board and the individual

As noted by Garey Barrell, K4OAH (2015), the Switchcraft 3502 is a great RCA connector, with a variety of finishes (chrome to matte black) https://www.switchcraft.com/assets/1/27/rca_plugs.pdf?7073

Cinch Jones 300-series plugs https://www.mouser.com/datasheet/2/643/ds_CCS_IND_jones_plugs_300_series-1358563.pdf Drake TR-7 transceiver (Rear Panel) has an 8-position Cinch Jones connector (308) for

Evan, K9SQG was the NCS for today's Drake Technical net on 7.238. He had 39 check-ins under good band conditions. Here are the radio's that were used to check-in. B Line 5 C Line 3 TR3 2 TR4 12 TR5 4

See: /g/DRAKE-RADIO/message/50555 73 -Jim NU0C "Doug Crompton WA3DSP" <wa3dsp@...> wrote:

Curious if Drake supplied RCA cables to connect the twins together. I count 6 sets. I have plenty of RCA cables from years of audio and video connections but I want to make a nice set specifically for

The only time I ever used the FAST agc position, is when listening to AM signals, like SWBC.....esp on the 41 and 49m SWBC? bands...both of which can experience rapid, fast fades. What might make

Somehow this discussion got off on measuring plate current, which makes no sense since there is already a means of checking cathode current using the two cathode resistors. In any case, my issue was

My memory isn't good enough to give specifics but I do remember that there are different DIN connectors that retain the same designation. ?As I vaguely recall, it might be 4, 5, pin styles. While

Hi Bill, There are multiple issues to consider. I always felt the Fast AGC decay speed was useless, and installing an extra C value (or R/C pair) across the Fast setting is a good idea. I would keep

Rob, Thanks for the info. I have a couple of questions: -Is the distortion I am experiencing on the M & F AGC settings normal? If not, have you seen this problem before? -The only mod I have found is

Be sure the Drake AGC circuit hasn’t been modified. Having worked on many R-4Cs over a 40 year time period it wasn’t unusual to have radios come into the lab with AGC issues. Also in that time

Sorry... 1 amp across a 1 ohm resistor will measure 1 volt. 73, Jim W7RY

Here is what I would do. Install a 1 Ohm 1% 1 Watt resistor in series with the plate supply at the bottom of the plate choke. Then simply measure the current across it with a milli-volt meter, (aka

Also here: https://www.youtube.com/watch?v=D0drh4V-cL4 Jim W7RY -- Thanks and 73, Jim W7RY

They are non polarized and more reliable than an electrolytic. See here: https://www.youtube.com/watch?v=67M7fsbLUIU 73, Jim W7RY -- Thanks and 73, Jim W7RY

Thanks Gary, I did notice that those switches are a bit "dirty".? I haven't put the rig on the bench yet. just getting prepared with everything I might need to give it a thorough restore to full

Gary, The S meter is behaving as you described with a steady signal. The only issue that has me puzzled is how the audio distortion increases as the AGC time constant is reduced. I haven't seen this

?S=Slow AGC response time M=Medium AGC response time F=Fast AGC response time Fast is only really suitable for use in CW and RTTY. SSB will get quite distorted in the Fast AGC position and less so