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barry hufker

Diamond Forever

Posts: 12,108 Member Since:26/01/2011

#1 [url]

Sep 11 16 11:19 AM

Here's the essence: "Having experimented with all the known substitute tubes for the VF14M, our ideas turned towards developing a circuit in which the characteristics of a brand-new tube were simulated rather than relying on the compromise of a vacuum tube "somewhat like" the original."

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gtoledo3

Aqua Marine

Posts: 4,110 Member Since:23/10/2013

#3 [url]

Sep 13 16 9:59 AM

Yeah, sure sounds along the lines of the Grosser solidstate valve replacement. (I think I'm remembering that right, maybe it was some other tech.)

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mdm

Platinum Blonde

Posts: 1,720 Member Since:27/01/2011

#5 [url]

Oct 6 16 4:02 PM

An EF12 sounds pretty good, IMO.. close to a vF14 at half voltage on the filament but the VF14 has a a different texture to it, not necessarily better but different

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maarvold

Aqua Marine

Posts: 3,093 Member Since:23/01/2011

#6 [url]

Oct 11 16 9:27 AM

mdm wrote:
An EF12 sounds pretty good, IMO.. close to a vF14 at half voltage on the filament but the VF14 has a a different texture to it, not necessarily better but different

I'll preface this by saying yes--I am fully aware of all the internet squabbling about how an EF14 is, sonically, not the same as a VF14; it seems to me like this discussion becomes more 'pie in the sky' every day due to the lack of availability of VF14's.  

I have a pair of U-47 'tribute' mics where they were built the same way by the same guy a couple of months apart--the intention was to build a fairly matched pair.  After the topic someone (Max?) started a couple of years ago about EF14 vs EF12, I had the mic maker switch one mic to an EF12.  It changed the character of the mic enough that I elected to leave the EF12 in because it became another useful 'flavor' in my toolkit.  When compared to the EF14 mic, the EF12 mic's character is less aggressive/forceful, less 'barrel-chested', more open & feels less dark than the EF14 version.  The EF12 mic gets at least as much use on vocals as the EF14 one... maybe more.  Sonically, it kind of sits midway between the EF14 mic and my (prototype) ELA-M250 'tribute' mic.  

I feel like getting a good-sounding tube is KEY to, particularly, having good-sounding large diaphragm tube mics for use on vocals.  In my somewhat limited experience, every tube has its own signature, although I found 5 Star GE 6072's to fall into a couple of families sonically.  If someone could come up with a way to substitute an accurately-performing replacements of excellent examples of the 'unobtanium' tubes it could be a GREAT thing for the microphone world.  I'm interested to hear more about these products.  

Last Edited By: maarvold Oct 11 16 9:35 AM. Edited 2 times.

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seth

Ruby Baby

Posts: 5,571 Member Since:26/01/2011

#7 [url]

Oct 11 16 10:19 AM

... I found 5 Star GE 6072's to fall into a couple of families sonically. 

Could you expand on tha Mike?
 

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maarvold

Aqua Marine

Posts: 3,093 Member Since:23/01/2011

#8 [url]

Oct 12 16 8:43 AM

seth wrote:

... I found 5 Star GE 6072's to fall into a couple of families sonically. 

Could you expand on tha Mike?
 

 
When I had my 250-inspired mics built, I auditioned probably 7 or 8 GE 5 Star 6072's ( I now probably own a dozen).  I didn't keep any extensive notes, but put a note with each tube that listed it's 'sonic personality' The one I picked sounded really natural and pleasing to the ear.  I remember that there was at least one other one that had a similar flavor, but wasn't as good.  I also found several that had a sort of brightish, upper mid focus which definitely seemed like a family grouping to me... there were at least 3 of these, maybe even 4.  I don't specifivally remember the character of the rest.  

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