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You can find photos of the inside of a 7077 here:

/g/DRAKE-RADIO/album?id=252836

It does have a small transformer in it to step up the voltage output to drive a TR7. No capacitors. And a cheap CB-era dynamic cartridge hidden inside the head. After this many years the blast foam behind the grill will have decayed to crunchy dust. Both the cartridge and the blast foal are easily replaceable.

On Sun, 02 Feb 2025 23:11:59 +0000
"Steve Wedge, W1ES/4 via groups.io" <w1es@...> wrote:

I went on to the 7238 Drake Pre-net this afternoon and strange things were happening. I heard some noise in the speaker when the PTT was pressed and WB0IQK said that I sounded excessively tinny. I was fortunate to have my $10 GE-branded Shure 444, which worked like a charm but, of course, I want to know what is wrong with the 7077, so I took it apart.

Oy, vey! What a mess inside! Someone had put in a couple of capacitors (low value) and what looks like a transformer. It's all kludged in there, so I know this ain't no factory job! Lots of lousy workmanship and electrical tape trying to hold things together!

The mic element I can't be sure if it's correct, though it looks like it all fits together like it should. The mic element measures around 430 ohms on my Fluke 77.

Is this simply a case of the wrong element in this mic? The TR7 manual specifies a high Z mic. I am tempted to simply get a Heil element for high Z and being done with it.

If any of you have a 7077 mic, can you measure resistance across the mic element for me? This should be from ground to pin 1 of the mic plug.

TNX & 73,

Steve Wedge, W1ES

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73

-Jim
NU0C