Sub-miniature tubes

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Wilebee is correct--it is AC701. Allegedly the only tube made specially for microphone use. It is almost impossible to get a good, sealed example. Very expensive--probably at least $400. According to Klaus Heyne, most on the second hand market are rejects. Get those only from well respected dealers if you can swing it.
 
Has anybody done the EF14-VF14 swap?
You have to mod the pwr supply/heater voltage, but Eric Barbour told me it's the same tube! And ten bucks compared to a grand, seems like it might be worth a try?
You could buy 3 or 4 to screen as the EF was tested very carefully, a lot of rejects.
Would not want to spend a grand and have the tube go noisy!
 
Wil is correct. The diameter is a hell of a lot larger than a pencil lead though!

http://img.photobucket.com/albums/v295/mnats/schoeps_221.jpg

Jeez, I'm too slow...
 
[quote author="cjenrick"]Has anybody done the EF14-VF14 swap?
You have to mod the pwr supply/heater voltage, but Eric Barbour told me it's the same tube! And ten bucks compared to a grand, seems like it might be worth a try?
You could buy 3 or 4 to screen as the EF was tested very carefully, a lot of rejects.
Would not want to spend a grand and have the tube go noisy![/quote]

Hey Chris,

Check these two links:

http://recforums.prosoundweb.com/index.php/t/574/0

and

http://recforums.prosoundweb.com/index.php/m/8441/0#msg_8441
 
[quote author="cjenrick"]Wow! Do those guys know their stuff or what!\Thanks Marik.[/quote]

Oliver Archut???? Oh boy, no kidding here. :thumb:
 
Hi!

I have a gorgeous Neumann U48(like a 47, but different patterns cardiod and fig 8- Cardiod sounds different, since back plate is held at 0v instead of not connected or something-or-other. My original acetate diaphragm failed, as they do after 40 years. To my surprise, it sounded SO much better after capsule was replaced. Then Tube failed, Replaced with original Telefunken EF14 with modded Power supply by Ashley Stiles at Saturn Sound. Whilst I have to accept that the sound is not the same as with VF14, I have less problems with sibilent singers than before. The only true electronic replacement for a VF14 is a UF14, which was the stock item in the Siemens version of the U47/8. the heater voltage is lower, but I cant remember the value, perhaps it is 25V? If you check Telefunken Data, EF14 is NOT the same! I found some EF14's in Paris, but they were Wermacht originals left behind after the occupation, and none of them passed any test, especially microphony, since most of them were perfectly good microphones in their own right . . . . . I found one UF14 on evil bay for $14 in Slovakia! However when it arrived, the new cleaner( who was from Chech Republic) threw it out before I had achance to install it . . . no wonder they seperated . . . . . BAH! . . . . anyway, EF14 is more than adequate in my book, and I use mine every day, and that is the only test in my book. I LOVE MY U48, VF14 or EF14, Her Ni Ner Ni Ner!


Please contact if I can help at all.


Andy P
 
regarding EF14/EF14... according to a respected mic tech i know, the U47 remake by Gunter Wagner in Australia

http://member.telpacific.com.au/gunter/U47-remake.htm

uses EF12k. this tech did an a/b test and said it sounds great.

gunter wagner also manufactures his own m7 and kk47 capsules for his mic's... woah.
 
[quote author="strangeandbouncy"]
The only true electronic replacement for a VF14 is a UF14[/quote]

Strange,

I don't think that is true. From european tube numbering systems you could suspect the UF14 to be a 300mA heater version of the VF14 - but it is not so. VF14 and and EF14 are related, UF14 is an entirely different tube:

http://recforums.prosoundweb.com/index.php/m/4873/1517/?SQ=af4b9a31311f53a45f082602d9b0538f#msg_4873

So the only true electronic replacement for a VF14 is still a VF14..

Jakob E.
 

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