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Author Topic: Which Neumann Capsule in DiY U47 Tube ?  (Read 5096 times)

Offline klaus

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Re: Which Neumann Capsule in DiY U47 Tube ?
« Reply #15 on: September 08, 2016, 06:34:24 pm »
Checked with Neumann: No K49fet, but maybe the poster mixed it up with this one:

Part # 514753 K47 FET  (TLM49) 
v.s.
Part # 053223 K47 FET (U47 FET)

According to Neumann, they both seem to be identical, though the latter is about $20 more expensive.
(Who was it who made fun of Neumann's capsule pricing on this fine forum before?)
Klaus Heyne
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Re: Which Neumann Capsule in DiY U47 Tube ?
« Reply #16 on: September 08, 2016, 10:08:35 pm »
Thanks a lot for this ! I actually called Sennheiser USA and emailed Neumann, and no one got in touch with me... I'm glad you are here. So this could be it, this "K49FET'", could be a "K47FET" with the backplate wired, as the TLM49 is leaning towards hypercardioid, when the U47FET is not. Could that be the explanation ?

Offline klaus

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Re: Which Neumann Capsule in DiY U47 Tube ?
« Reply #17 on: September 09, 2016, 01:41:47 am »
They were both explained to me as being identical in function and design.
So your assumption is either based on your superior fact finding abilities, compared to what I could accomplish, or is erroneous.

Klaus Heyne
German Masterworks®
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Offline Kai

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Re: Which Neumann Capsule in DiY U47 Tube ?
« Reply #18 on: September 09, 2016, 06:20:18 am »
They were both explained to me as being identical ...
In fact the Neumann published polar diagrams of the U47fet  show a hypercardioid,  the U87 and others a cardiod pattern.

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Re: Which Neumann Capsule in DiY U47 Tube ?
« Reply #19 on: September 09, 2016, 07:46:06 am »
They were both explained to me as being identical in function and design.
So your assumption is either based on your superior fact finding abilities, compared to what I could accomplish, or is erroneous.

Well I'm just trying to guess why they have two identical parts with different number. But as much as I wish I had those abilities, even more I rely on your expertise. I guess I will buy it, and I could post pictures on this thread, if anyone is interested.

Offline klaus

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Re: Which Neumann Capsule in DiY U47 Tube ?
« Reply #20 on: September 09, 2016, 12:41:21 pm »
In fact the Neumann published polar diagrams of the U47fet  show a hypercardioid, the U87 and others a cardiod pattern.
This discussion focuses not on Braunmühl-Weber double backplate capsules, as used in U87, but on single-backplate, K47-types.
Both types are incompatible in their polar and frequency responses.
« Last Edit: September 09, 2016, 01:48:32 pm by klaus »
Klaus Heyne
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Re: Which Neumann Capsule in DiY U47 Tube ?
« Reply #21 on: September 09, 2016, 08:53:33 pm »
So I went to Sennheiser Canada today, and guess what was in stock ? A K47fet ! Now I "just have" to install a wire on the rear side. Let us stay calm...