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 on: Today at 09:44:48 AM 
Started by ji43 - Last post by RuudNL
IMHO the U47FET is a multi purpose microphone.
In the radio station I used to work for, we had the U47FET in every studio for spoken word.

 on: Yesterday at 09:04:28 PM 
Started by Googaliser - Last post by gtoledo3
It looks to me like the inner structure may just be more expensive to make than the next design they went to, more than the aluminum itself being the issue. But I suppose some high tension aspect could be the factor there, I donít dispute it.

 on: Yesterday at 07:16:55 PM 
Started by ji43 - Last post by ji43
I know the FET47 seems to excel on kick and bass cabinet, though I am wondering where else this mic excels?

I saw studio footage of one of my favorite guitarists using a FET47 on acoustic guitar, and it seemed to get a really nice woody, organic sound.

Does anyone here use the FET47 on acoustic guitar, who can speak to how they like it relative to a tube Large Diaphragm Condenser, such as a U67. I tend to prefer the LDC sound to Small Diaphragm Condensers on acoustic in my productions, and thinking of picking up a FET47.

 on: Yesterday at 04:50:10 PM 
Started by Googaliser - Last post by Kai
Why should it be impossible to fit a piece of thin aluminum on a capsule now, when it was possible then?
If they want to they can, which might open my wallet.

I‘m quite happy with my U47 Fet reissue, it does what the original did.

Regarding miniature tubes:
Good sounding options exist, they don‘t last as long as an AC701, but don‘t cost a fortune to replace.
E.g. my Soundelux E250 uses an EF732; equivalent types are 5840, CV392,  5840A, 5840W, readily available for a few $ and sound good.
Had to replace it once in many year and have a handful of spares lying around.

 on: Yesterday at 04:01:11 PM 
Started by mikezietsman - Last post by klaus
The extremely high tensioned K50 capsule ("KK" stands for the complete capsule head) does not suffer the environmental challenges of PVC diaphragm deterioration, does not suffer from arcing holes like (much lower tensioned) nickel diaphragms in SM2, KM54 and KM56, and in general is very stable over time, from my observation through the decades.

"Plosives" are not so much an issue of a condenser capsule's diaphragm construction itself, but of the architecture of the capsule surround, its positioning in the mic (axial vs. perpendicular) and from vocals that produce too much air movement too close to the capsule.

K50 are not known for the latter issue, again, because of the K50's incredibly high diaphragm tension (which is also the reason why this capsule model was never reissued: the skills to replicate tensioning an aluminum diaphragm of that thinness to that high level of diaphragm tension has been lost).

 on: Yesterday at 03:21:25 PM 
Started by RuudNL - Last post by mikezietsman
I have nothing to contribute to the question but I do have to say:
There is something incredibly beautiful about the way those m7 were constructed.

Even though i have to look past the obvious issues with this particular capsule, it blows my mind that they could build something so precisely using glue to secure the diaphragm at its edges.

 on: Yesterday at 03:16:44 PM 
Started by mikezietsman - Last post by mikezietsman
Good Day,

I have fairly recently come into possession of an original aluminium kk50 capsule.

I know very very little about these capsules.
What are things to be careful about when using them?
Are they prone to long term failure in anyway like the m7 or loss of tension like the ck12?
Do they deal well with say, plosives, in the same way that a k47 or k67 might or should they be kept away from vocalists?
How do they handle exposure to environmental contaminants? and is it possible to clean them if they are sensitive to build up like the k47 and k67?

Obviously I intend to handle the unit I have with great care, but there is so little information about this most rare unit and it would be good to know what I am dealing with so I don't do something dumb and damage it in my day to day use.

(I am careful with my microphones but I do not consider a vintage microphones something that I should store and use on special occasions, most of my mics are in day to day use, if a part is not up to that I would rather know before it becomes a part of my repertoire)

 on: July 04, 2022, 02:20:41 PM 
Started by Googaliser - Last post by klaus
Let's talk about any and all details of the M49V a bit closer to launch.

Regarding a reissue of the M50:
Spheric omni mics and capsule heads with all kinds of diaphragm materials already exist, but the problem with reissuing the most desirable version of the M50 lies in an impossibly hard-to-manufacture aluminum capsule.

 on: July 04, 2022, 01:33:35 PM 
Started by RuudNL - Last post by klaus
You got it!
Corona oxidization- starting from the center lead-out and gradually going outwards - is caused by the electro-chemical interaction between polarization voltage and the metal alloy used in the conductive sputtering of the capsule.

The oxidization was again a problem during the first few years of the 1970s, then was forever eliminated by changing the formula.

 on: July 04, 2022, 11:40:02 AM 
Started by Googaliser - Last post by gtoledo3
I mean, they did release M49 and M50 concurrently, and would have them side by side in the catalogs, etc. Same circuit, different capsules.

I have been very surprised for M50 to not be part of the discussion.

Iím also very surprised with a different submini choice, and hope it has been implemented in a way that will last for time without sounding flabby much sooner than a typical fullsize tube, the way that pretty much an submini apart from AC701k get. That has always been the downside to all of these hearing aid related submini tubes, when implemented in typical M49 and U47 related circuits. They sound very good on the front end, but have a sound deterioration within a couple to few years of serious use.

Nowdays, the thought about marketing is to have no one hear about anything until the very day it is available. When people find out about something, it is when they are most primed for purchase.

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