The Mic

[analag]

This is something I'm throwing together for the K47 capsule I'm getting. It arrives tomorrow. As you can see I'm going for fixed bias with a DMOS keeping things stabilized. For those who are familiar with me. You can see my simulator in play on the screen. She never letes me down, lol.

 

[analag]

I'm going to give this China tranny a shot. I had to use an impedance tester to get the connections right. I expect good things. And sorry I never stuff PCBs strickly perf boarder here.

 

[analag]

Couple of power supplies from over the decades , they are all interchangable. B+ is discrete regulated and so on.

 

[analag]

This one has a 797 Audio edge terminated capsule. Very sweet.

 

[analag]

I used a Edcor mic input transformer set up for 5:1 which the source follower handles nicely. I have quite a few more or these things. I build them for fun and boredom relief. I also try not to clone, but stay in the..."inspred by" type thing. Hahaha.

 

[micolas]

View attachment 143410

I'm going to give this China tranny a shot. I had to use an impedance tester to get the connections right. I expect good things. And sorry I never stuff PCBs strickly perf boarder here.

Hi @analag! I wish you success!
The most challenging and beautiful part of DIY is experimentation. It gives me the greatest satisfaction.
* I think I saw an sct-800 there. Can you describe a bit what stock sounds like, and what mods you did?
I'm tempted to play with one.
(or is it a bm-800?)

Thank you!

 

[micolas]

This one has a 797 Audio edge terminated capsule. Very sweet.
View attachment 143412

797 CY039 ?

 

[analag]

Hi @analag! I wish you success!
The most challenging and beautiful part of DIY is experimentation. It gives me the greatest satisfaction.
* I think I saw an sct-800 there. Can you describe a bit what stock sounds like, and what mods you did?
I'm tempted to play with one.
(or is it a bm-800?)

Thank you!

It may be a body that looks like it, but all my mics are DIY. If I build a mic and I'm not satisfied, I gut it and start again. I built ten mics, two of which were solid state on my last building spree. This time it's going to be only four. All the parts are here or on the way. The 797 CY039 is an excellent capsule, I made five mics with them and I didn't have to manipulate the curve. Just put them in a simple circuit that is properly designed and let em sing.

 

[micolas]

It may be a body that looks like it, but all my mics are DIY. If I build a mic and I'm not satisfied, I gut it and start again. I built ten mics, two of which were solid state on my last building spree. This time it's going to be only four. All the parts are here or on the way. The 797 CY039 is an excellent capsule, I made five mics with them and I didn't have to manipulate the curve. Just put them in a simple circuit that is properly designed and let em sing.

Hi @analag
really valuable information, i like edge terminated capsules too
How do you get the 797 capsules?
Thanks!

 

[analag]

Hi @analag
really valuable information, i like edge terminated capsules too
How do you get the 797 capsules?
Thanks!

I sent an email stating that I was starting a small microphone company and I needed samples. So they made them up. I had to wait for them to be made. A combination of center and edge terminated. Had to do a wire transfer and all that. They all sound fantastic. None of that frizzy top end. I run them all in flat circuits and most times I don't need a deesser on vox. Center terminated is warmer and sits in the track, edge terminated is more up front, articulate and raw. Two very usable sound. The other day I made a mic with a cheap eBay dual sided K47 and a transformer I ripped out of my old TCM1050, it sounds gorgeous but noisy as hell. So that one is getting a revamp while I'm doing these four. After that an all pentode mic pre and that may be the end of my 49yr DIY career.

 

[micolas]

I sent an email stating that I was starting a small microphone company and I needed samples. So they made them up. I had to wait for them to be made. A combination of center and edge terminated. Had to do a wire transfer and all that. They all sound fantastic. None of that frizzy top end. I run them all in flat circuits and most times I don't need a deesser on vox. Center terminated is warmer and sits in the track, edge terminated is more up front, articulate and raw. Two very usable sound. The other day I made a mic with a cheap eBay dual sided K47 and a transformer I ripped out of my old TCM1050, it sounds gorgeous but noisy as hell. So that one is getting a revamp while I'm doing these four. After that an all pentode mic pre and that may be the end of my 49yr DIY career.

Fascinating stuff!
(I think you're joking! A passionate DIYer cannot retire. We are infected for life with this electronics virus)

 

[micolas]

@analag
...almost 60 years have passed since my mentor put the first Soviet germanium transistor in my hand..
Even now I have the same desire to learn new things, to build, to experiment. (though my eyes, hand and mind don't help me so much anymore...)

 

[analag]

Built my first amp when I was 12 . My second build was a 8 KT88 stereo amp at age 14. I moved on to studio electronics a few years before joining GDIY.

 

[analag]

Both are 6.5:1 which one should I use...hmmm.

 

[micolas]

Both are 6.5:1 which one should I use...hmmm.
View attachment 143472

Of course you will test them both. You will probably choose UTM.
What is the yellow one?

 

[analag]

The yellow one is from China.