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Author Topic: Neumann N52a: Voltages and Variants  (Read 1620 times)

klaus

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Re: Neumann N52a: Voltages and Variants
« Reply #15 on: February 02, 2020, 01:29:17 pm »

The SK73t and N52t heater voltage section have not much in common in components and circuitry. Anything with a circuit board that has an imprint like "SK73t" should have a circuit diagram somewhere...
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Klaus Heyne
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fffaustino

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Re: Neumann N52a: Voltages and Variants
« Reply #16 on: February 03, 2020, 10:16:42 am »

Hi again,

thanks so much Uwe and Klaus, for all the info, i really appreciated it. Sorry to say that I had not read it until this morning, after working on my psu...this is what i did;

I checked all the components carefully and discover that R3 and R4 were 10k instead of the 5k of the original schematic. I swapped them for two 8.2 kohms resistors and now i have gotten 119,5 at B+.
I really don´t know if i have acted correctly but the fact is that B+ is nearer from its ideal value now.

Many thanks again and let me know if i should correct something..

Alfredo
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uwe ret

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Re: Neumann N52a: Voltages and Variants
« Reply #17 on: February 10, 2020, 10:08:14 pm »

Pulling a few strings led me to this schematic for the N52t and SK72t. I am stll trying to ferret the one for SK73a.
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klaus

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Re: Neumann N52a: Voltages and Variants
« Reply #18 on: February 10, 2020, 10:26:07 pm »

Uwe, you are the best, and continue to be a treasure to the recording community.
Keep them coming! 
KH
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Klaus Heyne
German Masterworks®
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uwe ret

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Re: Neumann N52a: Voltages and Variants
« Reply #19 on: February 11, 2020, 11:34:19 pm »

BTW, SK73a is the designation of the Stabilyt module in the N52a as indicated in the previously posted schematic diagram.
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klaus

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Re: Neumann N52a: Voltages and Variants
« Reply #20 on: February 12, 2020, 02:37:03 pm »

SK73 suffixes are correct: 'a' = Stabylit, 't' = transistor (solid state) replacement module
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Klaus Heyne
German Masterworks®
www.GermanMasterworks.com
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