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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

I suppose you mean the D-104-C? In catalog 197 it is listed only 3 dB lower than the crystal version. Interestingly they don't specifically say which is in the T-UP9-D104 "Silver Eagle". That suggests

Jim's 470K resistor solution is a good one where the transceiver limits audio response to what we're normally accustomed to for SSB. I use a 470K resistor in the base of a D104 when using my Drake TR5

Astatic made another model the C-104 with a ceramic element. Very similar except the output is about 10db lower. This is for the element alone. If there is an amplifier the output levels are probably

Didn't say it did. - Jerry, KF6VB

I don't know of anyone who has needed to replace them but it should be possible to find or build a suitable substitute. You should be able to test them by watching the voltage swings at pins 1 and 8

Already covered. Twice. Thank you for your comments. 73 -Jim NU0C "Omni" <selcor@...> wrote:

That does not change what I wrote. 73 -Jim NU0C "jerry-KF6VB" <jerry@...> wrote: -- 73 -Jim NU0C

Encoders like this have two outputs.? If one has a broken wire or bad connection it will only change the frequency in one direction.? SInce yours seems intermittant, check the continuity of the

It appears that the Optical Interrupters are the problem. I took it completely apart and cleaned the sensors as best I could. I swapped sides for the 2 sensors so will see what happens. Does anyone

*** My homebrew amp is just a source follower. It has no voltage gain. Its only purpose is to present a high impedance to the element. I see that the "silver eagle" had a 26dB amp in the base. I