Neuman U47

[zeonrider]

Does anybody knows which tube used in old
NEUMAN U47, or someone have idea to replaced with
some modern tube or Fet.
regards zeoN_Rider

[DaveInVA]

Those Neumann mics used a VF14 originally. They are expensive if you can find one. The better ones were the VF14M which were supposedly hand picked for lower microphonics. Its similar to the EF14 only with a different heater voltage.


Dave

[Zen Mod]

http://www.google.com/search?as_q=&h...i&as_filetype=

[Wavebourn]

http://www.dvq.com/hifi/images/neumann.pdf

[aletheian]

Yeah, VF14 in triode mode. Good luck finding one of those! Other mics used an AC701 submini... good luck finding one of those too. They had one model, the U67, that used an EF86, which is the only of their tube choices that is still available.

I have seen people use different subs in the u47: 13CW4, EF814,EF14 etc. But they all sound a bit different.

[grhughes]

I dare to speak Heresey! There is a bunch of tubes you could use but the mod is major; socket and tube and some way to shock mount it. The 6au6wa would work. Sony uses it in their condenser mics.It's been used as a cathode follower and as a grounded cathode with great results.

[aletheian]

people are catching onto the 6au6 as a good tube... very linear in triode mode. There are some new ribbon mics out there that use it as well. That Sony mic (the 800 IIRC) used a triode strapped 6au6 with a special cooling circuit , as well as running the tube with voltage-starved filaments.

[BrianL]

A friend had a U47 back in circa 1970. At that time he purchased a "FET replacement kit" from Neumann to have on hand just in case the tube died. Don't know if he ever retrofitted it.

[zeonrider]

Forget "Tube" .
Lets make oldie with new hard .
For me tube is a steam engine forget , it is 21 s.
By the way Marry Cristmas !
Regards zeoN_Rider

[Alastair E]

Originally posted by zeonrider
Forget "Tube" .
Lets make oldie with new hard .
For me tube is a steam engine forget , it is 21 s.
By the way Marry Cristmas !
Regards zeoN_Rider

BUT, with anything other than an out-dated and obsolete Tube in one of these mics, it will sound Different.....

These mics have a particular following. If its changed from a tube, it becomes severely de-valued and performs differently...

Just like putting the engine from a 2006 Jaguar into a 1966 Ferrari....

It may perform the same ON PAPER, but it just aint the same, and severely de-valued....

For a replacement, you could try one of the Russian Nuvistors.....The 6C51HB which is equal approx to a 7586, but the Russian tube is MUCH less Michrophonic, and has wire-ended leads whch could be an advantage, as no socket is needed, although its gain may be a little lower than the VF14....