Ribbon mic foil sources

[Svart]

Oh yeah it was a pain to work with but it worked OK.  Even with a good pop screen it still shredded too easily so I lost interest in using that mic.  Maybe I'll get some of this other stuff mentioned in this thread and try it out.

Thanks!

 

[rodabod]

The exact value probably varies for the sign-writer's leaf as I think the original value was taken when STC/BBC R&D tried using it with the 4038 design. Remember that it was beaten as well, which may have reduced its original thickness.

Oh, Mark, I have a 4038 transformer out of a mic at the moment. It's a 30-Ohm model but if you'd like to test it at all, hen let me know. Otherwise, I can provide inductance, resistance, etc. measurements.

Roddy

 

[Marik]

Oh, Mark, I have a 4038 transformer out of a mic at the moment. It's a 30-Ohm model but if you'd like to test it at all, hen let me know. Otherwise, I can provide inductance, resistance, etc. measurements.

Hey Roddy,

I'd love to get those measurements. Pri. and sec. inductances and DCR (do you have a bridge to measure the pri?), as well as ratio (important). What core it uses? Can you tell material?
BTW, in Microphone Engineering Handbook there is a chapter by Peter Baxandall about step up (from 30 Ohm) transformer for the 4038. From memory, I think it is done on EI24-25.

Best, M

 

[tskguy]

Hey everyone,

I think I have mentioned this in another post before but I feel its worth mentioning again. I actually purchased ribbon material from John Peluso I don't remember exactly what I paid but it was enough material to make 60 or so ribbons. I'm pretty sure it is 2.5 microns thick. Much easier than the song writers leaf that stuff is impossible to work with!! He was very cool to deal with and was more than happy to sell me some. It may save you guys some trouble.
Also the mics I made with it sound pretty damn good. I A/B'd with some fat head 2's I thought mine sounded much better. Of coarse I'm a little biased
If any one wants to hear a clip I have a really good trumpet track that I recorded for a Jazz group. I think his name is Bobby Lewis for any of you Jazz folks out there.

Eric

 

[rodabod]

I'd love to get those measurements. Pri. and sec. inductances and DCR (do you have a bridge to measure the pri?), as well as ratio (important). What core it uses? Can you tell material?
BTW, in Microphone Engineering Handbook there is a chapter by Peter Baxandall about step up (from 30 Ohm) transformer for the 4038. From memory, I think it is done on EI24-25.

I don't have a bridge to measure the primary. Maybe I could make my own bridge with some copper wire as resistors and then send that  length of wire for measurement by you.  Otherwise, L, R and ratio shouldn't be too difficult when I get time.

Transformer is toroidal with a permalloy core. It is in a mumetal case for shielding.

I will try and report back.

 

[Svart]

if you guys happen to have a couple of pieces of ribbon material that I could get from you, that would be great.  After thinking about it, I don't really have a need to go buy a bunch when all I need it for is a single mic.

 

[rodabod]

I can probably send you some. Is this for a Chinese mic? Just handy to know the length. PM me your address. I may be a bit slow as I am on night shifts just now though. Need to send ddt some in Prague too...

 

[Marik]

I'd love to get those measurements. Pri. and sec. inductances and DCR (do you have a bridge to measure the pri?), as well as ratio (important). What core it uses? Can you tell material?
BTW, in Microphone Engineering Handbook there is a chapter by Peter Baxandall about step up (from 30 Ohm) transformer for the 4038. From memory, I think it is done on EI24-25.

I don't have a bridge to measure the primary. Maybe I could make my own bridge with some copper wire as resistors and then send that  length of wire for measurement by you.  Otherwise, L, R and ratio shouldn't be too difficult when I get time.

Transformer is toroidal with a permalloy core. It is in a mumetal case for shielding.

Ah, toroidal  8) 8) 8)
I wind my own toroidal transformers and find them superior, esp. for ribbon mics.
If you don't have a bridge then the only accurate way to measure DCR on the pri. would be some multimeter with Kelvin probs. I can accurately measure here down to 10th thousands of an Ohm and some microHenies. If you are not in rush to put the trafo back into the mic and would be willing to send it my way I'd measure it in and out, and send back the very next day.

Hey Svart,

If Roddy won't have time to do it soon you can contact me. Tell me the width of the gap (or the mic you want to put it) and I can send you already precut and corrugated one.

Best, M

 

[Svart]

thanks Marik, I think it'll be easier to ask you for the piece than Roddy, since the shipping will cost more and damage more likely from the perilous journey across the pond..  ;D

I'll measure and get back to you.

 

[rodabod]

Tell me the width of the gap (or the mic you want to put it) and I can send you already precut and corrugated one.

Svart, definitely take this offer! I'd be too lazy to cut and corrugate for you. 

Mark - I will be in touch and see about sending you that transformer.

 

[zebra50]

To add to the top list,

Advent sell foil sheets in a range of thicknesses, from 0.00075 mm up.

http://www.advent-rm.com

 

[nhaudio]

While we're on ribbon mic, I just saw that audio technica is coming out with their own ribbon mic and when they say this:
"Audio-Technica's patent-pending MicroLinear™ ribbon imprint minimizes lateral flexing for durable performance and accurate reproduction of the sound source, as well as freedom from ribbon distortion"

do you think they're revamping Fostex' idea with its printed ribbon?

nhaudio

 

[rodabod]

do you think they're revamping Fostex' idea with its printed ribbon?

Sounds like it. I'd trust AT to probably do this well.

 

[zebra50]

Interesting. Some months ago Crowley & Tripp were apparently offering to license their roswellite material out to other manufacturers, but now they've been bought by Shure I guess that's gone out the window.

 

[nhaudio]

do you think they're revamping Fostex' idea with its printed ribbon?

Sounds like it. I'd trust AT to probably do this well.

yes for sure and price is decent. I'd be curious to see the guts of it.

on an other matter, anybody (since we know now where to find the ribbons) know where I can find polarized magnets in Europe?
All the companies I've found, you've to buy in bulk. (100 euros only magnets is a bit pricy for me    )

cheers,

nhaudio

 

[Bluzzi]

You mean this?
http://www.audio-technica.com/cms/wired_mics/330bf5b3610f8f98/index.html

They also have another even more expensive one. No sign yet of anyone carrying them and what street prices will be but the 4047 lists at $895 and I got it for far less than that. Quality ribbon at $400 to $500 would be fantastic.

Jim

 

[nhaudio]

You mean this?
http://www.audio-technica.com/cms/wired_mics/330bf5b3610f8f98/index.html

They also have another even more expensive one. No sign yet of anyone carrying them and what street prices will be but the 4047 lists at $895 and I got it for far less than that. Quality ribbon at $400 to $500 would be fantastic.

Jim

yes.  4080 and 4081. will see street price how they go...