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Author Topic: telefunken ELA M910 Power Supply Question  (Read 406 times)

MikeCheck

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telefunken ELA M910 Power Supply Question
« on: June 26, 2024, 07:09:41 PM »

Hello!
Does anyone have information on this power supply and what mic it mates with?

Unloaded DC voltage measurements:
+ 160V (assuming B+ and would be 120V loaded)
+ 18V
- 3.5V

Also, it needs to be refurbished so doubt those measurements are accurate right now.

Thanks!
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David Satz

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Re: telefunken ELA M910 Power Supply Question
« Reply #1 on: June 26, 2024, 10:06:09 PM »

That was the power supply for the Schoeps M 200 and M 201 microphones, which used the EF 94 tube. The schematic as published by Telefunken is attached, along with the relevant page from the M 200 brochure; the corresponding page of the M 201 brochure is identical. The pin arrangements are as seen from the soldering side (i.e. inside the case).

It's possible that minor differences may exist among different versions of the power supply circuit, which the schematic may not reflect. But I'm saying that on general principle, not because I know of any such revisions in this particular instance.
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MikeCheck

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Re: telefunken ELA M910 Power Supply Question
« Reply #2 on: June 26, 2024, 10:49:04 PM »

Amazing! Thank you for this info.
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David Satz

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Re: telefunken ELA M910 Power Supply Question
« Reply #3 on: June 26, 2024, 11:20:06 PM »

You're welcome. That "Ela M" number sounded familiar, so I looked it up in my list and there it was. I've been studying the history of Schoeps and its products for the past bunch of years.

The small insignia in your photo with the serial number has their old trademark -- their formal name as a company back then was "Schall-Technik Dr.-Ing. Karl Schoeps" and you can see the "S" and the "T" in the circle -- the "S" being the horizontal, scope-like waveform superimposed over the "T".
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MikeCheck

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Re: telefunken ELA M910 Power Supply Question
« Reply #4 on: June 27, 2024, 11:29:43 PM »

Do you happen to have the Schoeps M 200 and M 201 as well?
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David Satz

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Re: telefunken ELA M910 Power Supply Question
« Reply #5 on: July 04, 2024, 11:39:04 AM »

Assuming you mean schematics and other documentation rather than actual microphones, yes. At this point in the company's history (1952) Schoeps published no product literature of their own, but funneled the information through Telefunken Ela, their main international distributor. So the only external literature is from them.

Do you actually have such a microphone? One thing to watch out for with this particular model: It came with a special output cable (between microphone and power supply) that had the microphone's output transformer and a few other passive components built into an in-line "pod". This was done for the sake of miniaturization. The M 200 was intended, among other applications, for use on a boom, and the idea was to keep its size and weight down to a minimum.

Thus the amplifier body contained only the EF 94 (6 AU 6) tube and its grid circuit components, with pretty much everything else banished to that outboard "pod" in the cable. Most of the time when I've seen M 200 or M 201 microphones up for sale on eBay or elsewhere, that special cable hasn't been part of the auction, and the microphone is incomplete without it. So if you're looking to get the microphone that matches the power supply, be warned. Also, the capsule head ("Ela M 921") of any M 201 should be carefully checked out prior to purchase--I get the impression that they may have needed more than their share of service back in the day.

[edited later to add:] The M 200 and M 201 used the same amplifier body, output transformer cable, and power supply. The difference was that the M 200 came with a simple, small, single-pattern omnidirectional capsule (Ela M 920) while the M 201 used a larger, tennis-racquet-shaped capsule head containing a figure-8 capsule and an omni capsule with a flat circular surround. When both capsules were enabled, the result was a cardioid pickup pattern that was smoother and more consistent than any other cardioid condenser microphone then on the market. A mechanical switch in the "neck" of the capsule head disconnected the figure-8 capsule, leaving a single-diaphragm, diffuse-field-equalized omni pressure transducer with the surround, making its characteristics very suitable for distant or semi-distant pickup of music in reverberant spaces. It was the favorite microphone for the Mercury "Living Presence" stereo LPs once they were able to acquire six of them (three each for their main and backup tapes).
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