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Glenn, Yes, 1N4007 performance as PIN at 30 MHz in that regard is not great. The measurements documented on the page below suggest around 6.5 pF at 10 MHz with some modest level of reverse bias, which

According to the 1N4007 datasheet, the diode has 30pF at 0V. That is approximately 177 ohm at 30MHz. UM9401 has approximately 1,1pF - docs:

I have seen that before but it's rare. Things like that can sometimes be caught by visual inspection. If not then we have to use good old fashioned troubleshooting. 73 -Jim NU0C "Pete Doherty W1UO"

I found I have that catalog in my collection. I was going by memory. Yes, the ceramic element is only about 3db less sensitive than the crystal. Same ratio for other ceramic vs: crystal mics in the

"The RV-75 I am working on, only decrements it will not increment." When I got mine back in the 80's it worked for a while and then developed the same problem. It turned out to be one of the DIP

Well, you could always bring the two grounds to the chassis via the connector shell as described by Bob Heil. That should be best if there is an RFI concern (Pin 1 Problem). Fan controllers are great

Except I claimed that spare pin for a dedicated PTT ground return! Both ground pins (audio shield + PTT) bond immediately to the chassis at the mic connector. Instead, I added my resistor in front of

Yes. The path through the 470K is a high level input intended for ceramic, crystal, and other high output mics. That is where the UG stand variants with a D-104 head should be connected regardless of

Ah. I didn’t look at that page I guess. Thanks a bunch for the info. Ed

Naw, just look at the structure of the URL and see if it contains extra junk beyond the base address. It's like shortening a eBay link. It doesn't always work out but it seems to more often than not.

On page 17 in the replacement cartridges. If you have a MC-563 then your head model is probably a 10DA. 73 -Jim NU0C "Ed KG5UN" <maikranze@...> wrote:

Sorry, a moment of dyslexia.? It should read the other way... including it on pin 4, excluding?it on pin 1. Paul, W9AC

Looking at the Drake Service Manual, the TR7 engineering gang included a 470K mic input resistor between pins 1 and 4 on the mic connector.? That gives the TR7 owner the option of using it on pin 1,

Yup, I shoulda' used TinyURL.? Clean PDFs of the same articles from Jim, K9YC are attached. Paul, W9AC

Even shorter. https://www.ranecommercial.com/legacy/note165.html "Jim Shorney via groups.io" <jimNU0C@...> wrote: -- 73 -Jim NU0C

Nope. I saw nothing there that will help me identify exactly what mic I have. Ed

The link to the Astatic catalog that I posted should help you. Note that the nomenclature for the head and the stand are different. 73 -Jim NU0C "Ed KG5UN" <maikranze@...> wrote:

With a TR7 I use the high level input which puts the total load on the cartridge to a around 1 Meg. What the higher load does is bring up the low end response (see attached graph). There's not much

Yep.? A pic of one my favorite mics. An Electro-Voice? 638 that I use with my TR7 and I'll use another 638 I have with the new to me T-4X. 73 Stan KM4HQE

Sorry if I am hijacking the thread, but I wanted to ask a question. I have a model 10 Astatic mic with no data plate on it. It has the MC-563 element in it. Would that make it a 10C or a 10D? I really