Comments on: Studio Microphones of 1954

By: Gary

Gary — Wed, 14 Dec 2022 13:12:45 +0000

In reply to R. M. Burrow Jr.. I too am interested to get a schematic since I just picked up a pile of Capps condenser mics. Thanks.

By: Gary

Gary — Wed, 14 Dec 2022 13:11:23 +0000

In reply to R. M. Burrow Jr.. Did you ever get your mic going? I just picked up a pile of them and wanted to get your thoughts?

By: John Charette

John Charette — Thu, 18 Feb 2021 22:59:43 +0000

In reply to R. M. Burrow Jr..

Hi RM, A friend recently gifted me a capps cm2250 microphone with the power supply. It is not working at all. Fortunately I came upon your post on Preservation of sound mentioning you have a schematic for the microphone and power supply. I you could scan and email it to me, I will be very indebted.
Many Thanks in Advance
John Charette

By: Gordie Johnson

Gordie Johnson — Tue, 29 May 2018 01:26:58 +0000

In reply to Larry DeVivo. Hi Larry, I’m reading this long after the fact. Do you still have that power supply and cable? I found a Capps 2250 at a yard sale. No power or cable but heck it was free?!?! I sure would appreciate any help in finding what I need to get it working. Thanks G

By: Anderson

Anderson — Mon, 30 Jan 2017 22:25:28 +0000

Was the Turner 57 considered a high end mic at the time? IIs it worth having at a studio?

By: JOHN McEntee

JOHN McEntee — Fri, 29 Apr 2016 23:29:24 +0000

I would appreciate any help I can get

Jack Mac

By: JOHN McEntee

JOHN McEntee — Fri, 29 Apr 2016 23:27:06 +0000

Dear sirs

I have a CM2011A CAPPS condenser microphone.could you tell me what it’s worth.

JACK MAC
Thank you

By: Don Bell

Don Bell — Fri, 01 Jan 2016 05:44:47 +0000

The Modern Jazz Quartet recording “No Sun In Venice” was recorded by Tom Dowd with a pair of Capps condenser mics. He had a battery power supply for the mics. The 2 mics went straight into an Ampex 350 2 track. It is a great sounding recording with amazing top end.

By: R. M. Burrow Jr.

R. M. Burrow Jr. — Tue, 29 Dec 2015 21:10:33 +0000

In reply to Mark Sullivan.

I own 2 Capps CM2250’s and have the paperwork.
I will be glad to send you a scan of the mic and p/s schematics. If you don’t have the power supply, it isn’t be hard to “homebrew” one if you are familiar with vacuum tube gear and respect the voltages involved. The tube in the Capps is either a 6AK4 or a 5703. 5703’s are fairly easy to find. The Belden p/s to mic cable is hard to find, but the Gotham (Bethlehem, PA) cable should work. PM me on FB and mention the CM2250 schematic.
The power supply furnishes 225 v dc plate and 6 v dc for the heater. The heater voltage must be elevated above ground to avoid exceeding the tube heater/cathode voltage rating, and for low noise.

By: Larry DeVivo

Larry DeVivo — Tue, 29 Jul 2014 01:10:20 +0000

I believe I have an extra power supply should you need and want an original one. Think I have an extra cable for it as well. Will check when I get up to the lab tomorrow. Feel free to contact me if interested.