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 1 
 on: Today at 02:09:11 AM 
Started by blackacre - Last post by Spindrift
So, not a tube, despite marketed as a tube. Frustrating.

You have a mic which is probably pushing northward of $15,000 in value. I wouldn’t bat an eye spending upwards of $1000 or a bit more for a NOS AC701 tube from a reputable source. Devaluing your vintage Neumann with an aftermarket “tube” is illogical.

 2 
 on: November 19, 2021, 03:37:41 PM 
Started by Jay Hills - Last post by Jay Hills
There are some new low cost audio interfaces currently available.  I was advised that there were good converters on Lynx Aurora line, but for me, it would be a large investment.  So I was just wondering if there are any acceptable converters on any of the interfaces priced around 10% of the Lynx gear.  If the converters are only 10% as good, then maybe I have to seek investment in my project to afford it, however if they are like, 80% as good, then maybe I can record a lot sooner.

Specifically, I've seen the Volt have a claim about their converters being, 'world class,' or something.  SSL has an affordable interface, there are others.  I have an old Roland Octacapture.  I also don't know where I'd find this info or know if I would be able to figure it out if there were specs available on the AD/DA.  So that's, 2 questions.  Maybe a 3rd question: Are R/E/P folks using the specs or ears to determine the answer to the converter quality question?

I didn't really care up to this point because I was only doing demos for myself but now I'm considering something to be sent for mastering and release.  I don't wan to send something out to be mastered only to have the guy say, wtf is this you are sending me? I can't do anything with it, go back, get better gear and redo it, try again later, newb.

 3 
 on: November 14, 2021, 07:21:05 PM 
Started by blackacre - Last post by blackacre
So, not a tube, despite marketed as a tube. Frustrating.

 4 
 on: November 14, 2021, 04:33:53 PM 
Started by blackacre - Last post by klaus
There are a few options marketed as drop in replacement tubes that don’t require circuit or power supply changes.
Drefahl Audio and Phaedrus Audio both make drop in replacements ...

Let's be clear: these are transistorized solid state devices that try to emulate the sound of tubes.

 5 
 on: November 14, 2021, 02:51:09 PM 
Started by blackacre - Last post by blackacre
There are a few options marketed as drop in replacement tubes that don’t require circuit or power supply changes.

Drefahl Audio and Phaedrus Audio both make drop in replacements that I considered as a back up if only because even after finding an AC701, and spending a lot of money, the tube may not work, let alone be up to spec.

At this point we may be approaching the end of the era of these microphones as they were originally built. Unfortunately my M49 had an M7 capsule that is also shot like every other m7 at this point. Tom is going to switch to a K47 and I am going to frame the M7 in a display case.

Thanks for all your perspective and experience.

 6 
 on: November 14, 2021, 12:52:17 PM 
Started by RuudNL - Last post by klaus
... and I am not sure whether polarity matters on a DC heater supply?

 7 
 on: November 14, 2021, 04:32:18 AM 
Started by RuudNL - Last post by RuudNL
Many thanks Klaus!
(Inconsistency between schematic and 'the real thing' is about the last thing I would expect from Neumann!)

 8 
 on: November 13, 2021, 10:33:39 PM 
Started by blackacre - Last post by klaus
Not sure what you mean by "replacement" tube, because I am unaware that there is such thing.

The AC701 is unique- it was made by Telefunken specifically for condenser mics offered by three companies only. Any mic originally designed to be powered by that tube will either not work with a substitute tube, will need to have circuitry, cable or power supply modified to even function, and if these hurdles are overcome too, none of these mics will ever sound the same as those with the original AC701.

But I understand the temptation; when a tube costs a lot of money, people will search for, and suppliers will offer supposed substitutes.
That path and its poor results are amply demonstrated in the field of capsules: sourcing Neumann and AKG capsules has become expensive, so it is tempting to be lured by aftermarket "reskinning" offers. Never mind the inevitable loss of value or sound quality.






 9 
 on: November 13, 2021, 09:57:23 PM 
Started by blackacre - Last post by blackacre
Good to know. I won’t name the specific vendor but that information came from an after market tube manufacturer that explained why their replacement tube would fit my m49 but not the c60. My original thought was to put the replacement tube in the c60 after so that both mics worked. Well the hunt continues.

 10 
 on: November 13, 2021, 06:55:57 PM 
Started by blackacre - Last post by klaus
That is erroneous information. The AC701 had always had the same form factor/dimensions, from the start to the last one leaving the factory.

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