MXL 960 tube mic mods

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AV

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Jan 1, 2018
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11
Hello
Just purchased a used MXL tube mic. All stock components.
I am planning to change capsule for a new one. Any recomentations?
Maybe 797Audio?
 

ZHAOMENG

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如果您需要797音频胶囊,可以联系我。我来自中国,我是中国唯一一家小批量销售797音频胶囊的供应商55.jpg66.jpg33.jpg
 

ZHAOMENG

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If you need 797 audio capsules, you can contact me. I am from China, and I am the only supplier selling 797 audio capsules in small quantities in China
 

haysonics

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Oct 8, 2017
Messages
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Hello
Just purchased a used MXL tube mic. All stock components.
I am planning to change capsule for a new one. Any recomentations?
Maybe 797Audio?
Please forgive the question (I am new here) but what don’t you like about the stock capsule ?
 

mrgrooves666

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Feb 1, 2021
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Its cheap. Besides 797 audio, also Maiku are very nice capsules, but I would say their K47 would be a best bet for that mic, don't believe it has deemphasis. Or if you want to stick to k67, try 3U audio's dark k67 version with modified backplates.
 

AV

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Jan 1, 2018
Messages
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Thanks for the replys, guys.
This mic has only cardioid pattern so I thinks that I must purchase a K47 one.
Anyone tried the WTG capsules? Maybe not as good as the Maiku...
 

Gus

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How much tdo you understand circuit design?
Is it the same circuit as the V69?
V69 Mod | Mark-O-Matic

Filter/EQ between stages is what first comes to mind before changing a capsule or caps
If so you might be able to add a LPF between stages and keep the stock capsule.

I have a V69 and I don't understand the design I started to trace mine and stopped IMO not worth the effort except maybe adding a lowpass filter

It appears to be an anode follower charge amp at about a gain of -1 to a GUESS Schoeps? like circuit output circuit.

I would guess you could remove the tube and go to the input JFET(I would change it to a different JFET if it is a 170 and rebias the JFET)and add a lowpass shelf filter in the circuit.

The input is a big distance from the capsule

I am not going to add any design work in this thread the post is just some things to get people thinking
 
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haysonics

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Oct 8, 2017
Messages
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Thanks for the replys, guys.
This mic has only cardioid pattern so I thinks that I must purchase a K47 one.
Anyone tried the WTG capsules? Maybe not as good as the Maiku...
The 960 is a cardioid only mic. Installing a 2 sided (multi-pattern) capsule will not make it multi-pattern.

BTW and FWIW: My first tube mic was the 960 and if you change the stock tube for another then it becomes a good mic. I recommend you start by opening the mic (screw the bottom bell off) and advise what is written on the tube (as it may have already been changed).
 
Last edited:

haysonics

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Oct 8, 2017
Messages
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How much tdo you understand circuit design?
Is it the same circuit as the V69?
V69 Mod | Mark-O-Matic

Filter/EQ between stages is what first comes to mind before changing a capsule or caps
If so you might be able to add a LPF between stages and keep the stock capsule.

I have a V69 and I don't understand the design I starter to trace mine and stopped IMO not worth the effort except maybe adding a lowpass filter

It apears to be an anode follower charge amp at about a gain of -1 to a GUESS Schoeps? like circuit output circuit.

I would guess you could remove the tube and go to the input JFET(I would change it to a different JFET if it is a 170 and rebias the JFET)and add a lowpass shelf filter in the circuit.

The input is a big distance from the capsule

I a not going to add any design work in this thread the post is just some things to get people thinking
As far as I am aware no one has ever traced the mic circuit. The board looks like a V69.
 

Gus

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I find it hard to believe the tube change made the microphone any better. The only changes I noticed with a tube change in a circuilt like that was microphonics and noise differences. The charge amp feedback minimizes the "tube sound"
I gave up tracing because I did not think the microphone was worth the effort.
 

haysonics

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Oct 8, 2017
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Yes. I swapped out the stock Chinese 12AT7 for a NOS Mullard CV4024 (military grade 12AT7) and there was a majour reduction in microphonics and noise. Considering that model is over 10 years old now I would expect any existing stock tube to be kaput.

All I will say about "tube sound" and the 960 is that the tube did compress transients (nonlinear amplitude response) which is all I really want a tube to do.

IMO, apart from the stock tube, the mic was fine (considering its price). It garnered a lot of praise over on the purple forum (FWIW). To noticeably improve it you'd need to replace both the capsule and circuit so I appreciate where you are coming from.
 
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Gus

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Something to try with that microphone would be to remove the tube
Install a source follower like in the Schoeps microphones very close to the capsule
Add EQ between the SF and next stage
 

haysonics

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Oct 8, 2017
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Apart from the price, the thing that impressed a lot of folk was that the 960 did not sound bright. Assuming the stock capsule is a single sided K67, it would be interesting to know whether the capsule was tuned to be relatively flat or if there is a filter in the circuit. My guess would be the later.
 
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AV

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Joined
Jan 1, 2018
Messages
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Thank you guys for all teh info.
Gus, I am a musician. Sadly I do not understand almost anything about electronic.
A technician do the electronic job in my mics.

So, I am considering recapping, change tube or capsule but modding the circuit is difficult.
 

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