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Author Topic: VF14 sans "M"  (Read 415 times)

Mannix

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VF14 sans "M"
« on: July 24, 2020, 11:35:59 pm »

Was there ever a time early on when V14 tubes were just not stamped with an M? Is it proven that non-M VF14 tubes are inferior?
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klaus

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Re: VF14 sans "M"
« Reply #1 on: November 18, 2020, 12:43:33 pm »

So sorry to reply so late: permanent posts have pushed regular posts to the second page. I will figure out a way to change that.

As to VF14M vs. non-M: my sticky (https://repforums.prosoundweb.com/index.php/topic,1149.0.html) explains this. Read the last few chapters.
Neumann always selected and labeled VF14 with low microphonics with a while "M" paint stamp. Only after those ran out, in the 1970s and beyond, Neumann also installed and sold non-M versions when they ran out of pre-tested ones.

An I hinted in the sticky post: there is a gradation of microphonics in VF14, because they are ALL microphonic. A more or less arbitrary cut-off was established at which point it was deemed that the ringing of the tube's filaments was beyond acceptable. Hence borderline non-M versions that ended up being sold that will work just fine.
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Klaus Heyne
German Masterworks®
www.GermanMasterworks.com

gtoledo3

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Re: VF14 sans "M"
« Reply #2 on: November 19, 2020, 04:34:28 pm »

Klaus, have you ever run across a VF14 that is glass, coated fully with zinc, and then painted?

I understand that some were made like this, maybe RFT(?). I have never seen one, though I have seen other “metal tubes” that are really just zinc coated and black painted glass.
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klaus

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Re: VF14 sans "M"
« Reply #3 on: November 21, 2020, 02:58:18 am »

I have not, Its one of Oliver's Unicorns.
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Klaus Heyne
German Masterworks®
www.GermanMasterworks.com
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