The Mic

[analag]

It's exciting! You just described the adrenaline effect on the DIY addict!

The best part is that I don't have to do this again. Regular Neumann type circuitry with a bit of feedback from the tertiary winding.

 

[analag]

It's alive!!!!. I had to get to work to figure out the undocumented Chinese BV-12 that thing maxed out my impedance tester that goes up to 200H. I calculate 206H on primary 8.9Hsecondary and 1H on tertiary, give or take a few mH, I also had to figure out the polarity and such. I would love to throw it into a solid state mic. The mic sounds awesome and it not even properly warmed up. All the three mics are seriously nice so far. I have one more to go. Currently waiting on a K47 flat from Arienne and a UTM0547 as part of my original order.

 

[analag]

I hope to not open it any time soon. I had to reach for an old Radio Shack 1uF 250V cap to fit the tight space. Luckily it sounds a great as I remember. To me that is.

 

[analag]

On to the next.

 

[analag]

Lil group shot with a few of the kids. I have quite a bit more in the closet behind me. Some I haven't fired up in years. The TLM style will be the final one.

 

[analag]

The carcass of my first one. She had a great run. I keep her as a reminder of where mic building started for me, back when there was no Albaba and whatnot. One simply broke out the hacksaw and go true DIY...ya dig? Lol! Anyway thanks for this last bit of motivation I got the other day from visiting this forum.

 

[analag]

Moar pics! OK, I predicted that the China large core 6.5:1 was going to knock and it does so I immediately procured another one. I also stated it was dry wound. But I have the sauce for that. Transformer varnish, not to be confused with wood varnish...haha. Anyway this is some non commercial stuff I have been using over the years. Sometimes when I need a transformer with certain requirements I roll my own, be it power or audio.

 

[analag]

Easy pic, the other examples are enclosed and in the racks. 670 inspired thing. Instead of the bunch of power trannys used on the original I wound one with all the secondaries. I kept the entire build symmetrical right down to the wiring. No noise! She is about 18yrs old and still going strong.

 

[analag]

B + 130V, tube 5703w but any of those medium Mu pencil tubes will interchange. Omit V3! The pair of 1.5K on the transformer secondary was used to simulate load, omit as well.

 

[bremusound]

Easy pic, the other examples are enclosed and in the racks. 670 inspired thing. Instead of the bunch of power trannys used on the original I wound one with all the secondaries. I kept the entire build symmetrical right down to the wiring. No noise! She is about 18yrs old and still going strong.
View attachment 144220

What is the purpose of the large pineapple slice?

 

[k brown]

What is the purpose of the large pineapple slice?

Spent so much on mic DIY, he's now on the Dole.