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rbond

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Posts: 3 Member Since: 27/04/2017

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Apr 27 17 1:51 PM

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Looking for help in jogging my memory on these supplies I found buried deep in my equip locker... I'm not finding much (if any) info on these online anywhere... 
Are these "original" power supplies for AKG C60s?

Would love to test them... but want to make sure what to match them with! (sorry for the dark pic!)

Anyone?
cc6164a430f92e7ada68d66c7629293220d727ad 
13316cae3bff2a71d5c988a1587067928596574f 
406166a331f7207dda1d6d41a2ba235f99c44849


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John Eppstein

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Posts: 1,217 Member Since:31/05/2015

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Apr 27 17 3:20 PM

rbond wrote:
Looking for help in jogging my memory on these supplies I found buried deep in my equip locker... I'm not finding much (if any) info on these online anywhere... 
Are these "original" power supplies for AKG C60s?


Would love to test them... but want to make sure what to match them with! (sorry for the dark pic!)


Anyone?

image image 
image

You are correct - these are power supplies for the C60 mics. http://www.coutant.org/akgc60/

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panman

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Posts: 532 Member Since:04/02/2011

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Apr 28 17 4:35 PM

Yes, no info to be found on these. This is the first time I ever seen even pics. I have N60A and B60 and for these you can easily find the schematics too. There is no output-trafo inside the C60, but it is integrated in the PSU. To my knowledge they(N60, N60A and B60) all have differend output-trafos for the mic and that is the biggest reason they make the C60 sound differend. My C60 with B60 sounds really good and appealing, but not quite so with the N60A. It just is not as nice sounding. B60 has Moser 2214 and N60A is with Henry Radio 3147(V4895). I believe the N60 is with Henry Radio 3135 and if I am not wrong this is the type Oliver was also making. Better check the filter-caps before powering up the PSU.

Esa Tervala

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rbond

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Posts: 3 Member Since:27/04/2017

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May 1 17 3:46 PM

appreciate the feedback, John and Esa... interesting info re the output transformers... strange there's not more info on these.
Cheers!

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klaus

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Posts: 387 Member Since:19/02/2012

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May 1 17 4:29 PM

The supply looks like an officially commissioned U.S. made product (or a lovingly rendered copy).

If I read your opening post correctly, you do not have a C60 mic to go with this supply?  

You can still use the supply with any AC701-powered mic, other than a C60, as long as you:
* remove the audio transformer from the DIN-to-XLR audio output chain
* get the supply into a healthy state  (checking caps and resistors)
* assign the DIN connectors correctly, to correspond to your mic, and 
* carefully ramp up voltages on first turn-on, not to stress the AC701. 

In the end, you want to measure 4.00 VDC max for tube heater and 120VDC for B+, the former measured at the mic, not the supply.
KH

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panman

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Posts: 532 Member Since:04/02/2011

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May 7 17 2:00 PM

panman wrote:
 My C60 with B60 sounds really good and appealing, but not quite so with the N60A. It just is not as nice sounding. B60 has Moser 2214 and N60A is with Henry Radio 3147(V4895).
 

I have to take that statement back. I just wanted to be sure if it was true and started testing my C60 in regard of the PSU:s. I also checked the voltages and adjusted them. Sure enough the N60A gave a thinner sound and less bass than the B60. But it was no AB test and yet the difference was very clear. I wanted to repeat the tests today, but the N60A gave out no signal, just quiet crackles. Since the voltages were correct, the culprit turned out to be  the three-position bass roll-off switch, that was corroded and a cleaning brought the sound back. Not only that, but now the sound is full and with bass and all. Without an AB-test I can only say that both N60A and B60 sound good now.

Esa Tervala

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rbond

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Posts: 3 Member Since:27/04/2017

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panman wrote:
panman wrote:
 My C60 with B60 sounds really good and appealing, but not quite so with the N60A. It just is not as nice sounding. B60 has Moser 2214 and N60A is with Henry Radio 3147(V4895).
 

I have to take that statement back. I just wanted to be sure if it was true and started testing my C60 in regard of the PSU:s. I also checked the voltages and adjusted them. Sure enough the N60A gave a thinner sound and less bass than the B60. But it was no AB test and yet the difference was very clear. I wanted to repeat the tests today, but the N60A gave out no signal, just quiet crackles. Since the voltages were correct, the culprit turned out to be  the three-position bass roll-off switch, that was corroded and a cleaning brought the sound back. Not only that, but now the sound is full and with bass and all. Without an AB-test I can only say that both N60A and B60 sound good now.
... somewhat relieved to hear that! thx for the update. I want to get these units up to snuff and find good homes for them ;)

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