need to know if anyone here can draw a schematic for the nady trm6.

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flashlamp

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I will add-in my 2-cents worth about you getting a schematic for this mic that will probably go over like a lead-balloon here in this thread!!!

Depending upon whether or not you are here in the U.S. or not, you could ship your mic to me and I could "Reverse-Engineer" the insides of your mic and draw up a schematic and create some other documentation for you as well. In my "real job", I have "Reverse-Engineered" PCB's ranging from a 1974 API mixing console and the 1968 ALLISON Research "Gain-Brain's" to PCB's designed in 1979 that were used in fighter jets needed by a defense contractor who lost the schematics of their circuit boards. So, I - think - I might be able to handle a single vacuum-tube microphone "Reverse-Engineer" project.

Here-at-home I have the full-blown CADENCE/OrCAD "PCB Editor" Release 17.4 Schematic & PCB Design software ($3,000+) suite and I could help you out by not only coming up with a schematic, but also re-create the PCB layout, although that probably doesn't need to be done. I also have the SolidWorks Premium 2021 3D Mechanical Design software ($7,000+) that can be used to create the mechanical design of any 3D CAD-models of the mic. And, I mention the pricing of my software - NOT - to brag or anything like that, but to only inform you that I don't work with any of the - FREE - CAD software that is so commonly prevalent on this board. I perform mechanical and PCB designs for aerospace/avionics companies, defense contractors, medical electronics firms, R&D laboratories and others and I need to use the same high-end industry standard CAD-design software as those types of companies use. Just sayin'.....

Audio-wise, I have a ROYER SF-12 Stereo Ribbon Microphone and a stereo-pair of CASCADE "Fat-Head" Ribbon Microphones. Long ago, I once owned a B&O "BM-5" Stereo Ribbon Microphone, so.....as one ribbon-microphone lover/user to another.....I'll help ya out, if ya wanna!!!

/
can you pm me your email. so may reachn you.
 

flashlamp

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yes im in the us. would photos work if if take enough you could make a 3d pointcloud from the images work or would i need to mail you the actually mic.
update took photo of the board found an stamping # on the circut board
 

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Whoops

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Here-at-home I have the full-blown CADENCE/OrCAD "PCB Editor" Release 17.4 Schematic & PCB Design software ($3,000+) suite and I could help you out by not only coming up with a schematic, but also re-create the PCB layout, although that probably doesn't need to be done. I also have the SolidWorks Premium 2021 3D Mechanical Design software ($7,000+) that can be used to create the mechanical design of any 3D CAD-models of the mic. And, I mention the pricing of my software - NOT - to brag or anything like that, but to only inform you that I don't work with any of the - FREE - CAD software that is so commonly prevalent on this board.

Hi mate, it's all good you have all that experience and tools, but in this case even a simply hand drawn reverse engineered schematic made by someone less experience would be good enough, it's a really simple circuit.
But it's great that you offer to help and that's that kind of help that members here provide that got me into this forum in the first place.
Thanks
 

flashlamp

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I should think I proably also check the resistance of the transformer that came loose from the pcb. with the multimeter to find the dcr values?
 

flashlamp

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some green tape that holds the transformer in place, also as the 4 pins of the transformer that came loose. it might be that transformer could of been over heated from soldering iron while trying to repair it. I think may be causing an open circut i should check for that with the meter .
 

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Whoops

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Mate I can see just 11 components on that pcb, really simple traces...

What are you waiting to trace and draw that circuit out?
 

Khron

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Mate I can see just 11 components on that pcb, really simple traces...

What are you waiting to trace and draw that circuit out?

That would involve actually DOING something (constructive)...
 

flashlamp

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ok i think i may have figured it out , the black wire is going to the secondary winding of 1 first transformer which yellow wire the secondary of the bottom transformer both meet at 2 electrolytics labeled T2 and T3 on the back of the circut board which go to metal film resistors before they enter the primary windings.
 

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flashlamp

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i did not draw the socket wiring. but i think ive narrowed it down to a yellow and black wire.
 

flashlamp

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can you see where it says t2 and t3 where the black and yellow socket wires go to the electrolytics capactitors junction where also the black and yellow wires go from the pcb to the socket.
 

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MidnightArrakis

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Hi mate, it's all good you have all that experience and tools, but in this case even a simply hand drawn reverse engineered schematic made by someone less experience would be good enough, it's a really simple circuit.
But it's great that you offer to help and that's that kind of help that members here provide that got me into this forum in the first place.
Thanks
THANKS!!! for the comment, but I - think - that Flashlamp wants more than just a schematic. I am getting the impression that he would also like to have a cloned/replicated PCB as well. I could be wrong, but that is what I think. In any case, for me or anyone to do that they would need to have the actual physical PCB in order to exactly duplicate the PCB that is inside his mic. Some guy in Florida a couple of years ago or so physically mailed me a set of PCBs from his 1974 API mixing console so I could exactly duplicate those boards for him and he could have them made all-new again. And, while there were several items about the layout itself that I could have easily improved upon (i.e. pad sizes, routing, grounding, etc.), this guy wanted his boards - EXACTLY - as the originals with no changes, so that's what I gave him. Those layouts made me cringe, but the paying customer wanted - EXACTLY AS IS - and that's what he got!!!

/
 

Whoops

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THANKS!!! for the comment, but I - think - that Flashlamp wants more than just a schematic. I am getting the impression that he would also like to have a cloned/replicated PCB as well. I could be wrong, but that is what I think.

I don’t know where you got that impression from...

This is what the op asked:

need to know if anyone here can draw a schematic for the nady trm6.
or need to know if one of the wires is soldered corectly to the 7 pin socket to xlr male jack.”
 

flashlamp

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I don’t know where you got that impression from...

This is what the op asked:

need to know if anyone here can draw a schematic for the nady trm6.
or need to know if one of the wires is soldered corectly to the 7 pin socket to xlr male jack.”
i dont need new pcb.
 

Whoops

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You were pretty clear of what you wanted, I don't see any reason for confusion...

You are almost there, just improve the schematic you drawn by including the 12AX7 socket, the capsule and the XLR connector.
Draw what you know and leave disconnected with an "?" mark what you dont know
 

flashlamp

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ok i will work some more on the tinycad schematic. i can also post it here if anyone would like to tweak it.
 

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