Convertible capsule ?

[ubxf]

Hello
Has anyone tried a convertible design for their G7 ?
i was looking at this site http://www.korbyaudio.com/kat4.html
and wondering how hard it would be to implement
Best Regards
francois

 

[Marik]

[quote author="ubxf"]Hello
Has anyone tried a convertible design for their G7 ?
i was looking at this site http://www.korbyaudio.com/kat4.html
and wondering how hard it would be to implement
Best Regards
francois[/quote]

From their website:

Introducing "The Convertible". A revolutionary microphone system of hot plug-able, interchangeable capsules designed and hand built by Tracy Korby. The authentic sound of vintage Elam, AKG, and Neumann Microphones from the past has been painstakingly recreated By Korby Audio Technologies.

All these mics have very different sound not only because of different capsules, but also because of completly different grills, mic bodies, electronics, and PSU's. How can you make the mic to sound like AKG if it is a Neumann circuit?
A connector would not be the best way to attach grill to the body. Also, the capsule-->grid wire should be as short, as it is possible.

 

[CJ]

Exactly. Like trying to make a strat into a Les Paul by putting a chrome-bucker on it.

 

[Lindell]

I sent an email to Korby asking if he would sell any capsules, here´s the reply I got:

Thank you for your inquiry. Unfortunately we are unable to help with the capsules. We make all our capsules and our prices would not be cost effective for you to buy.

Useless information..... but cool to share.... :razz:

 

[Lindell]

When I tried the KAT-4 Korby there was a two way switch on the power supply labeled "251-12" & "47-67".... Some hokus pokus maybe?

Great sounding mic(s) by the way....

 

[dukasound]

[quote author="Lindell"]When I tried the KAT-4 Korby there was a two way switch on the power supply labeled "251-12" & "47-67".... Some hokus pokus maybe?

Great sounding mic(s) by the way....[/quote]

Switch is for different voltage. Ela M251 and C12 use 120VDC but 47 use 105VDC and 67 use 210VDC.
What about different tubes?. In case Ela M and C12 tube are the same but 47 used V14 and 67 EF86.
Circuits are for all of four type different. I agree about great sounding.

 

[ubxf]

cjenrick wrote:
Exactly. Like trying to make a strat into a Les Paul by putting a chrome-bucker on it.

i thought that's the way you supposed to do it
actually i'm interested in the mechanical part of the swapable capsule
so that i can experiment with different grille design and or different
capsules. What kind of connector is used between the head and the body of the mic?

Best Regards
francois
[/quote][/b]

 

[Marik]

[quote author="buttachunk"][quote author="Marik"]All these mics have very different sound not only because of different capsules, but also because of completly different grills, mic bodies, electronics, and PSU's. [/quote]


...not to mention specific sonic signatures of tubes and transformers...

how can you make a Sowter or Lundahl sound alike ?
how do you make an EF86 sound like a 6072........ ???


maybe their marketing people can tell us how they do this :green:[/quote]

Yeah, that's what I meant by "electronics". :grin:

actually i'm interested in the mechanical part of the swapable capsule
so that i can experiment with different grille design and or different
capsules. What kind of connector is used between the head and the body of the mic?

I am not sure about Korby's, but U47 used gold plated 7 pin tube socket, then the grill secured on the body with screws. If you insist on doing this thing, you could try gold plated XLR connectors, but once again, it is not the best way to do it. If you want to experiment with different capsules, I'd suggest old-good method--soldering iron.

 

[Gus]

IMO the power supply voltage, operating points and tube curves are what make a microphone warm or very clean.

Look at the voltages in a u47, ELA M251 and a U67. To my ears a tube running at a higher plate voltage tends to be clean and hifi. Thats one reason the square microphone circuit is the way it is I can change the B+ and somewhat change the sound of the microphone. The somewhat original biasing I used keeps the bias voltage fixed, it was inspired by the u47 bias, it looks cathode biased but is more like a fixed voltage bias. The resistor to the top of the cathode diode supplys "helper current" to keep that point very stable. It also allows the heater voltage to change and plate voltage to move a little with a drop in B+ and it stays at the same bias voltage.

 

[ubxf]

Marik wrote:
I am not sure about Korby's, but U47 used gold plated 7 pin tube socket, then the grill secured on the body with screws. If you insist on doing this thing, you could try gold plated XLR connectors, but once again, it is not the best way to do it. If you want to experiment with different capsules, I'd suggest old-good method--soldering iron.

Thanks Marik . Do you know what they used in the Telefunken 251 ?

 

[AudioJunkie]

Here's a website with pics of the heads and mounting.

http://www.vintageking.com/new_detail.cfm?NewInventoryID=484

Daniel