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 on: May 14, 2021, 08:54:19 am 
Started by Thomas W. Bethel - Last post by Thomas W. Bethel

 on: May 13, 2021, 02:37:49 am 
Started by rdraudio - Last post by Kai
The other day I had a new car battery installed and the tech sprayed something from a spray can on the battery connections, he said if there was any corrosion left the color of the spray would have changed and I had the impression the spray also cleaned.

I don't know if that applies to NiCd corrosion.
No need to spray (never spray!) strange chemicals, probably not intended for this use which possibly make things worse.

To clean certain areas of printed circuit boards I use a thin hose, taped to a (water capable) vacuum cleaner.
While applying cleaning fluid with a small brush - usually demineralized water + isopropyl alcohol - I vacuum away the fluid from the board.

This way I can limit the cleaning fluid to the contaminated areas of the board, preventing it from spreading the contamination.
At the same time this technique removes ALL contamination, as the cleaning fluid isn‘t just drying on the board, but completely sucked away.
Always suck away the fluid from the brush before dipping it into the fluid for the next dose, to keep the fluid clean.

This works well even with very high impedance circuits, where every little bit of residue disturbs the function.

Warning: Don’t do this with microphone capsule’s diaphragms.

 on: May 11, 2021, 03:55:11 am 
Started by Bo HansÚn - Last post by Bo HansÚn

Of course, I will keep you updated regarding these transformers.
These ▄35 and ▄54 versions seem to have come into the shadows when it comes to newly manufactured replacement transformers.


 on: May 11, 2021, 02:49:24 am 
Started by Bo HansÚn - Last post by klaus
...and please update this thread, once you had a chance to compare fit and finish, and, most of all, sound!

 on: May 11, 2021, 02:02:37 am 
Started by Bo HansÚn - Last post by Bo HansÚn
Thanks Jim,
I've now contacted Dave Hill and am waiting for a reply.


 on: May 09, 2021, 11:54:51 am 
Started by Bo HansÚn - Last post by Jim Williams
Jensen has developed some mic transformers. They have excellent Swiss winding machines and the expertise. Contact Dave Hill.

 on: May 08, 2021, 01:18:34 pm 
Started by Bo HansÚn - Last post by mbrebes
Another possible source that does custom transformers is Cinemag.

 on: May 07, 2021, 04:19:33 pm 
Started by Bo HansÚn - Last post by Bo HansÚn
Thank you Klaus,

Sure, if it was a similar simple setup and think of electronics as for example Neuman or AKG most common mics, it would not have been a problem to find the measuring points on the circuit board.
But this is a messy circuit board, and looks like a pretty odd circuit solution with many switching functions, so in this case I would appreciate having a schematic on the workbench.

Ok, I do not give up so easily, I will return and share with you the experiences of troubleshooting these mikes.
One is noisy and crackling and the other is weak and unclean.


 on: May 07, 2021, 03:31:16 pm 
Started by Bo HansÚn - Last post by Bo HansÚn
Thanks Klaus, yes I will do so.


 on: May 07, 2021, 03:20:29 pm 
Started by Bo HansÚn - Last post by klaus
Check with Dennis Maximova, head of TAB Funkenwerk/Atelier Magnetics in Washington State (sales@tab-funkenwerk.com).

Let him know you found the info on my forum. That may help.

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