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Author Topic: Can you tell me what was modded on my U67 via pictures?  (Read 686 times)

Derek Samuel Reese

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Can you tell me what was modded on my U67 via pictures?
« on: December 20, 2020, 05:15:56 pm »

Happy holidays everyone,
I was wondering if a knowledgable person can tell exactly what was modded on my u67, if i posted clear pictures here ?
If so, it would be great to also know how many components were replaced.

I love my mic but I know it was modded in the past, but the guy who performed the modifications will not tell me exactly what he did, (his secret sauce I suppose)
I can only tell that the S2 switch was removed, outside of that I have no clue.

If someone is kind enough to help me, I will post great quality photos,

Thank you, and I hope everyone has a safe and Happy Holiday.
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klaus

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Re: Can you tell me what was modded on my U67 via pictures?
« Reply #1 on: December 20, 2020, 06:59:36 pm »

I understand if someone does not want to share his "secret sauce".

Most if not all circuit alterations of condenser mics are straight-forward. With a schematic, a versed microphone technician could easily deduct what's different from a stock U67 circuit, and be able to tell you. If photos are not conclusive, a personal inspection certainly will.
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Klaus Heyne
German Masterworks®
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Derek Samuel Reese

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Re: Can you tell me what was modded on my U67 via pictures?
« Reply #2 on: December 20, 2020, 07:33:21 pm »

Hey Klaus, I should have asked you to check it out when it was in your presence.
Would it be ok if I uploaded a few photos here to see if you can tell visually ?
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klaus

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Re: Can you tell me what was modded on my U67 via pictures?
« Reply #3 on: December 21, 2020, 01:15:49 am »

I'll make a (one-time) exception, but please consider that a forum cannot reliably authenticate mics.
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Klaus Heyne
German Masterworks®
www.GermanMasterworks.com

Derek Samuel Reese

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Re: Can you tell me what was modded on my U67 via pictures?
« Reply #4 on: December 21, 2020, 02:21:56 pm »

I appreciate this Klaus :-)
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RadarDoug2

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Re: Can you tell me what was modded on my U67 via pictures?
« Reply #5 on: December 21, 2020, 02:57:20 pm »

The yellow caps and the 15K 10% resistor. Thats a funny one. Also some caps down by the transformer?
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klaus

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Re: Can you tell me what was modded on my U67 via pictures?
« Reply #6 on: December 21, 2020, 03:25:37 pm »

Three filter caps and R10 (the 15kΩ resistor) were replaced.
Assuming you are concerned that these changes would negatively affect the performance of the mic, I can assure you they won't.

As audio only passes through these components indirectly, I would leave them alone.

 
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Klaus Heyne
German Masterworks®
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Derek Samuel Reese

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Re: Can you tell me what was modded on my U67 via pictures?
« Reply #7 on: December 21, 2020, 03:44:24 pm »

Just thinking out loud here, are all the components that were replaced still available if i ever wanted to buy them ?
I have no idea what an un-modded u67 sounds like as this is the only one i have tried.
It truly sounds fabulous on all sources thanks to Klaus.
I have no concern at all, the mic sounds insanely beautiful, i was simply curious and thank you for this guys.
I would like to wish everyone a safe and happy holiday and hope that 2021 will be much better for all of us
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RadarDoug2

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Re: Can you tell me what was modded on my U67 via pictures?
« Reply #8 on: December 21, 2020, 03:46:05 pm »

I find it strange in this day that someone would fit a 10% carbon resistor in a vintage mike.

(A precision DC volt meter applied to the junction of R10 and R11 could tell whether the replacement resistor is off enough so push the bias voltage outside the prescribed 1.6-1.8. VCD. But I doubt it. K.H.)
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Derek Samuel Reese

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Re: Can you tell me what was modded on my U67 via pictures?
« Reply #9 on: December 21, 2020, 05:33:18 pm »

Where exactly are you seeing this ?
Just trying to learn a little here :-)

I am seeing two yellow cylinders looking things closest to the head basket,
and one more on the left side of the ef86 tube,
then another one on the opposite side of the microphone (right side).
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klaus

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Re: Can you tell me what was modded on my U67 via pictures?
« Reply #10 on: December 21, 2020, 07:11:39 pm »

There are two yellow caps in the head, and one sideways next to the tube.

The resistor in question is next to the big metal shield (tube side of amp): it has color bands of brown, green, orange and silver.

first color = brown = 1
second color = green = 5
third color = orange = number of zeros = 00
fourth color =  silver = % of tolerance = 10%
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Klaus Heyne
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Derek Samuel Reese

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Re: Can you tell me what was modded on my U67 via pictures?
« Reply #11 on: December 21, 2020, 09:32:40 pm »

Brown green orange and silver? I thought that was an original. lol what is that??
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klaus

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Re: Can you tell me what was modded on my U67 via pictures?
« Reply #12 on: December 21, 2020, 11:59:46 pm »

Radardoug referred to a resistor that was changed. It's identified in one of your picture by the 4-color ring. I described where it is located in my previous post, where I mentioned that it's likely not relevant to the mic's performance.
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Klaus Heyne
German Masterworks®
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Derek Samuel Reese

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Re: Can you tell me what was modded on my U67 via pictures?
« Reply #13 on: December 22, 2020, 10:31:33 am »

I appreciate this guys, I’m not touching anything, was just curious
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RadarDoug2

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Re: Can you tell me what was modded on my U67 via pictures?
« Reply #14 on: December 22, 2020, 02:11:11 pm »

Neumann used the best resistors they could find when they built these mikes, but they do fail. Replacement with a cheap carbon resistor I find insulting to the heritage.
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