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Author Topic: Why no LDCs based on the AC701(k)?  (Read 2528 times)

ttown

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Why no LDCs based on the AC701(k)?
« on: March 12, 2011, 11:52:08 am »

The title says it all, and while I recognize that the AC701 was designed as a miniature tube for SDC applications, why was it not used in an LDC? 

Or maybe it was and I am totally missing something.  It's such a beautiful sounding tube, I bet it would excell in large diaphragm format!

-Terrence Town
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matti

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Re: Why no LDCs based on the AC701(k)?
« Reply #1 on: March 12, 2011, 12:15:34 pm »

It was like with M49, many others also I think but that came to my mind first

Matti

Edit. Should be

Matti Lehtonen
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klaus

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Re: Why no LDCs based on the AC701(k)?
« Reply #2 on: March 12, 2011, 02:56:53 pm »

Here is a partial list of large diaphragm microphones that were designed for AC701:

AKG/Telefunken ELA M250/251 (i.e. the main large diaphragm mic made by AKG at the time)
Neumann M49, M249, M269 and derivatives, SM69 (i.e. aside of the U67, all large diaphragm mics made by Neumann at the time)
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Klaus Heyne
German Masterworks®
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Kai

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Re: Why no LDCs based on the AC701(k)?
« Reply #3 on: March 14, 2011, 09:09:59 am »

I have a Horch RM2 which uses the AC701k.
From outside the Horch looks like an U47.

Not that I think it's a good idea to use a tube that is no longer in poduction and still in use in so many vintage mics, which raises the price for the tube.

Regards
Kai Schluenz

 
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ttown

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Re: Why no LDCs based on the AC701(k)?
« Reply #4 on: March 14, 2011, 04:40:23 pm »

Wow, shows how little I know.  I had no idea that there were LDCs out there that used the AC701.

Certainly the M49 is a studio classic, but I am left wondering about the sound of these other AC701-based LDCs.  Do they have the smoothness of the SDCs that employ the AC701?  Does the AC701 empart the same tonal characteristics onto the LDC's capsule?

Unfortunately the M49 is WAY out of my price range.  Maybe though some of these others represent bargains to be had?  Now my interest is piqued; I would be very interested in trying one of these out.  Where should I start?

Thanks guys!
-Terrence Town
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klaus

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Re: Why no LDCs based on the AC701(k)?
« Reply #5 on: March 14, 2011, 05:59:50 pm »

A good example of the AC701's smoothness is the M269- for all intents and purposes it's a U67 aside of the tube and the supply voltages optimized for that tube. The rest- capsule and audio ciruitry is identical in both models.
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Klaus Heyne
German Masterworks®
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