El Fito's Homemade Ribbon Mic

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El Fito

Well-known member
Joined
Apr 23, 2005
Messages
53
Location
London, UK
OK, here are the pics of my ribbon mic project: http://elfito.myphotoalbum.com Let me know what you guys think.

As for the sound, I don't know what it'll sound like, as I'm still awaiting for a Sowter 1:40 trafo. Keep tuned to hear more. :green:
 
Whoopsy :shock:! OK, try now. Click on the thumbnail to see all the pics in the album, and then on each pic you want to enlarge.
 
Some perforated plated steel I bought yesterday at a diy shop. I carved the negative of the screen shape in a plank of wood, placed the metal sheet on top and banged it with a hammer :twisted: until it bent as required. It is 1 mm thick, so it took a fair bit of hammering.
 
hey fito ,
thanks for your kind comments at my mic post

your stuff looks great!

Ilike yur grill work too
what are you using behind the screen?

and BTW nice base...how did you get that flare on the base...split the seam and fill?? (at least you had a nice snack too lol....inside joke)

BTW:I hope both our mics work too..ok ...lol

I think we are ok
i think my next one will have more of a traditional look
I found a peice of material that looks exactly like a mini-RCA 77
it will look real nice too.
just went for more of a modern look this time.
anyway great work
looking forward to hearing the finished project.
later
ts
 
Toobie, thanks for your comments. Take a look at the pics again, as I've updated the website and there are more photos now that illustrate the grille from up close and the mesh inside.

Basically, I went to the pound shop down the road and bought a wire mesh sieve for... well, one pound, which I promptly proceeded to butcher to make an inside hood-like contraption with the same shape as the grille. Next, I cut a piece of nylon fabric from an old pair of trousers. I figured that'd be the best kind of material to stop plosives, so I sewed it tightly to the outside of the mesh, so that it sits between the wire mesh hood and the grille.

As for the flare thing you asked about, it's actually quite simple: I cut a piece of mild steel wire, I'd say about 3.5 mm thick which I had lying about. I bent it as required and then soldered it to the inside of the yoke. Filing and sanding followed to smooth it out, and then a bit of brass varnish to prevent it from tarnishing.
 
fito I am building a mic now similar to an RCA 74b.
I will have a grill like yours.
would you please post some more pics of the grill making process.
Did yo use a ball peen hammer...chisels ...or anyother tools...
what did you use to cut the material and trim?
was ther a positive and a negative to your mold/wood form?

ALSO: yoiu mic looks so nice more people should see it..so...
I will fix some pics for you...real nics like...
hey...hmmm i tried it wouldn't work.

this is what it should look like ... anyone know why fito pics won't work ?

view_photo.php


fito if you google "+free +"picture host*" you might find a better hosting site for your pics..which are quite lovely BTW.
maybe the site is the problem (the way it's set up...album etc)

anyway,looking forward to those grill making pics
thanks
ts
 
Toobie, I have been very busy at work and unable to check the forum for a couple of days but, hey! what a nice surprise! Thanks so much for hosting my pics :grin: ! I will take a couple of pics of the jig I made for the grille. Yes, I used a ball-end hammer and to cut the metal used a dremmel with a metal cutting disc attachment. I'll take the pics and upload them over the weekend.

By the way, on the technical side of the mic, I fitted the mega-buck sowter trafo, which is ever so small for such a pricetag :shock: ! Anyway, the output is super low, which I think is due to the magnets being really thin (maybe some 1.5 mil or so), so I ordered a pack of 25 neo magnets to use as replacement (well, I'll only use a couple!). The new magnets should do the trick, as their size is 25 mm x 5 mm x 5 mm (so I'll use two on each side to make a 50 mm long magnetic field). Since I'll be doing some more work on it, I might rework the frame a bit as well and redo it in iron to optimise the whole thing.

As for the sound, it sounds amazing, especially when coupled with the new plate reverb I made and which should be the subject of another posting. Just imagine, the ribbon mic + the plate reverb + the Ampex pre! Yes, it all sounds very Jazzy and vintage, which is just the ticket for the kind of music I play.

Anyway, back to the grind now... :sad:

Later :thumb:
 
hi fito I missed your input while you were away...:sad:....hahaha
nice to see you're back..:wink:
first i want you to know i sourced neo's and found this wonderful ebay store called magneticlife they have great deals on neo's I mean rediculously good deals. I will get some neo's 50mmx10mmx1.5 (i think that's it...definitly 50mm is right) they are $10 for 10 neo's!!!!!:shock: well plus shipping 5gbp worlwide free shipping for added orders. They're gonna freak when I order 100 hahaha lol
and I think they have the one's you are using too...yes I'm sure of it.
check em out

I thought you'd like the pic fix suprise. I can host your new ones too...ya know.... till you find a good host. np (no problem)

hey ya know I've been thinking and friend to friend /designer to designer:
I think your mic looks soooooo nice but:
I am currently working on an old school mic like your and have been considering some of the same challenges you have faced.

I would like to see you beef up that yoke to match the absolute beauty of the rest of the mic. It looks a little out of place....I know in the back of your mind you were thinking the same thing..or I wouldn't have mentioned it...(ok yes I would have... hehe) but I will say that I am saying this and I have suggestions too. I don't want to just make a statement without thinking past the problem. here is a suggestion or 2

1
OK as for the way it is mounted to the base.. I know you have seen the guitar player "strap lock" systems. I think you could attach the part that would normally attach to the guitar to your mic .....and the other part to a nice beefy yoke,,or maybe even the same yoke... I think the union of the yoke and the mic catches my eye the most. that may be enough to spruce it up a bit and get those details kikkin....

2
ok one wacky idea I had for a yoke for your mic was .
..ok don't laugh i think this will look cool....a horse shoe
....ok i hear you ......I know your laughin.....lol ...me too though..
but really it would look cool right? have that puppy chrome plated and wham! :shock: coolsville.
3
I don't think you would necisarily even have to use flat metal.
I have seen brass rod in the hardware store you could ...hammer the ends flat.....bend it ....and maybe use some cable clamps at the bottom to hold the rod to a flat plate with the unit you already have for mounting to a mic stand. if you found a peice that was chrome already that woudl be cool too ...but you know it will be harder to hammer flat.

anyway I hope you know I enjoy chatting with you and hope you know i just want your "bird" to sing and be as pretty as she can be....ok?

I think the grill on this mic is so spectacular and the body is a nice color and looks good too. sweetining up th yoke would be icing on the cake.

I will be usein these ideas above for my next mic ...maybe even the horse shoe...hehe

I have my brohter-in-law building a base for me out of copper...he is a master copper guru. he does this everyday for a living and he has the right tools too. this will look cool ... i can't wait. :grin:


BTW sorry to hear about your output...man do I know what that is like...but you have to admit ... i did sound good and that was exciting to know that your final goal is just around the corner..you got it..stick with it..

oh and BTW are all your tools magnetized now.....like mine....hahahaha
all my screw drivers and small tools are now magnetic...oh well....lol
I guess it's the perils of the trade...hehe

my new mic will be an RCA 74b clone i'll try to get the pics up tonight if I can in a new post....look for it the TCA 74b hehe

ok glad your back. don't forget to check out magneticlife on ebay.
later
ts
 
man ...i might be wrong here....i'm looking at your pics again and i just think maybe some cooler thumb screws....only one of your pics shows the yoke well.
I have seen at hardware stores (or maybe shop that specializes in lighting) they have lots of cool stuff to hold lamp shades in place. all kinds of crazy designs...maybe you could find some that look like dice or diamonds... cool ...right? :grin:

I'm a freak about taking pic af individual parts...that way the tiny detail can be appreciated..something I missed ...at my first glance. the yoke is cool. :oops:

yeah... just some cool thumb screws
you could have diff one for each client...hahah some skulls for the metal guys ...they'd like that huh? lol
have some fun with it...i know I have...lol
later
ts

ps ok ...i know....i think pretty far outside the box sometimes... :oops:
a gift and a curse..... lol :grin:
 
Toobie, as always, your input is most appreciated :grin:. The yoke suggestions got me thinking... I have thought of the thumbscrews already. For one thing, I made them myself with normal bolts and a washer soldered on the head at a 90 degrees angle and then filled with solder (and then filed, sanded and lecquered, etc.). My inspiration to make them like that came from the screws on the sides of bandoneons (you know, that bellowed instrument to play tango - talk about thinking too far outside the box!). Anyway, the thing is... the washers I had at hand were far too small. Anyway, a change is on the cards as I agree with you that the thumbscrews are one of the most eyecatching features of old school ribbon mics.

Tomorrow morning I'll pay a visit to the diy warehouse. I am planning to buy some length of iron channel, a shape like this: Ll if I can find it. Here is how I intend ot rework the "machine" of my mic: the inside faces of the channel should be 5 or 5.5 mm, which is where I plan to put the new magnets. The channels, given their shape, would also grab a pvc block on either end (i.e. top and bottom of the mic, where the ribbon attaches), thus being a most logical shape to use as a frame (do you picture what I mean?).

As for the thumbscrews, I'll keep looking around, as I'm also considering potential yoke replacements (only maybe...). At the moment I'm like a mad scientist, collecting rubbish and seeing ribbon mic thumbscrews and other esoteric things where normal people see, say, cooker knobs or drawer handles. Wait a minute! drawer handles... I think that's it! I'll look out for those at the warehouse tomorrow! I think I suffer of overactive imagination... :shock:

Anyway, thanks a lot for offering to host my pics! I'll surely have a few more this weekend, with a few more details. The pigtail assembly is looking sweet, by the way, you'll see.
 
hey fito
I'm gald we have such a wonderful repoir with each other. I was laying awake and thinking what a perfectionist over critical ass i was...haha
I haven't felt right since.....your comments made me feel much better now. thanks.

It's funny you mention drawer handles ...I saw some at my hardware store that looked simi-circular...turns out three... side to side makes a circle..I thought "what a nice shock mount this will make...If I decide to do this you will see what I mean...very industrial looking.

be sure to look into those lamp shade holder nuts...they come in all kinds of freaky designs....ya know people like cat...dogs and lizards ..whatever ..even clowns..like me...hahaha and they make lamp shade holders to reflect these admirations. (maybe you could find some scooby nuts...ok that don't sound right...lol)

and also don't completely discount a jewler. I have considered a silver logo made at a jewler of my lil cat logo...(it looks cool ...trust me on this one)

you know I've been beggin people to explain this magnetioc return circuit to us but so far I don't completely understand it..
I have cloned my RCA and I think I am understanding more.

you might want to try somnething like this too...(from my self imposed RCA class haha)
on the back of the mag structure there is an iron square with the middle empy for air flow to the back of the ribbon... I assume that this basically takes the two seperate magnets and bonds there outer surface so that the 2 mags act like one single magnet...like as if the magnets were batteries and connecting the two outer connections will boost your power.
Like I said... I have seached the metas for a good explanation and waited for someone to explain it to me.....well I'm just stuck trying to figure it out myself..
In a previous post I stated what I thought to be true as i understood it ...asked someone to confirm or correct and no one did...I don't get it....

what really freakin me out is I have 10's of questions on my posts and as soon as someone else asks a question (in my post) it gets answered and my questions are ignored...I don't think I have pissed anyone off but I am starting to get a complex....:sad: maybe I ask too many question ...I don't know....I don't want to complain ....the forum HAS been goood to me...and still is...I just want to be treated equally...I offer up everything I know and help to carry my part when I can. I enjoy helping people.......
"when you help others you help yourself in the end"
that's how I feel...
anyway

did you check ou the magneticlife neo thing? on ebay?

my brother will order my magnets for me today. I may get some of those little ones you are using too..

I haven't really taken the time to try to imagine the new config you wrote about...your internal designs seem quite nice and I'm sure you are on to something good...I'll meditate on it and also wait for the pics..hehe

anyway good luck as always
I'm glad we were of like minds on designs...I feel better now:grin:
later
ts
 
Hey Toobie, back online. I have checked those magnet people out on eBay. As a matter of fact, I think I bought my first four magnets from them. I was surprised to open the jiffy envelope and find my magnets and... a KitKat! quite a nice little gesture, especially bearing in mind that I ended up using the magnets, eating the KitKat and then using the KitKat's aluminium foil for ribbon making! You should give that a go; the foil is so thin it breaks just to look at it. Maybe a little bit on the thick side for ribbons, but still, super cost effective :grin:!

Anyway, as I told you before, I bought a bag of 25 neos to play with, so I can experiment at my leisure. Excellent stuff, much better than the previous ones (thicker) and if you are buying a few your best bet maybe is buying from a business. I went to these guys http://www.neodymium-magnets-uk.com/BUY_neodymium.html and got quite a good deal: all 25 neos for about a tenner (sterling) plus VAT and postage. Take a look at those rods (and check out the sheer power!). I have a few ideas about those I'd like to try too, like having a rod on top and one at the bottom and attaching pole pieces at either end, like I've seen some early RCAs...

Anyway, I've uploaded a pic of the jig I used to make the grille, I hope it gives you a good idea of how to go about it: just a female mould , place the piece of grille on top and bang away with the hammer until you get what you want. Metal usually deforms pretty easily, which is quite cool. You just make a mould, hammer on it for long enough and hey presto. Anyway, the pic is here: http://elfito.myphotoalbum.com/view_photo.php?set_albumName=album01&id=grillejig

By the way, I am re-making my ribbon mic's engine room. The shell remains the same, but under the bonnet lives a completely different beast. The previous frame looked very sleek, whilst the new looks more like a tank - but there's a very good reason for all this change. I'll say no more for now and will let you see pics when I'm done with this baby - hopefully before the end of the week. I also picked up a super cool stainless steel spice container from the supermarket which looks like a stubby cylindrical thingy. I can already picture it evolving into a highly neat, 1950's looking cardioid ribbon mic!
 
El Fito, very cool. there's not too much info on this subject. it's good to see there are other people into trying this. i too began making a ribbon mic. i bought the sowter 1:40 trans. and made a prototype element out of wood and copper. i couldn't find any ribbon material that was selling for under$100 a sheet, but i found something very close: capacitor grade foil. i was able to get a roll of 5 micron, 100% pure aluminum for $4. i used 2" X 1/2" X 1/4" NEo magnets. my first tests sounded very good. very smooth sound. it sounded good with vocals and my guitar amp, but not so good as a drum overhead mic(not enough high end). i am currently rebuilding it to try and correct the frequency response. the first ribbon was 2" X 1/4". the next element is going to be 2" X 1/8". i am hoping that the thinner ribbon will respond better to higher frequencies. anyway, nice work on the mic!
 
cosmo
congrats on your ribbon mic build you should post some pics for us.
can you post the source for this cap foil you mentioned
that wouild be a great help to all on this forum.
thanks
ts
 
sure. the photos might take some time but here's the link to capacitor foil: http://www.capacitorindustries.com/materials.htm
 
Cosmo, thanks for the praise and all the best in your project. Toobie, thanks for letting me know about your RCA clone pics. It's looking promising! Do keep me updated :grin:.

I've run the first test with my new engined mic and the output is at least three times better than before. By the way, check out the new pics: http://elfito.myphotoalbum.com/view_photo.php?set_albumName=album01&id=newengine and http://elfito.myphotoalbum.com/view_photo.php?set_albumName=album01&id=pigtail

I too have noticed that the sound can be overly bassy with these beasts. It was a good job that I made a vari-tension mechanism for the ribbon. I noticed that the slacker the ribbon (up to a certain point), the better highs it presents. However, it does have its limitations HF-wise (mind you, testing it with an old, all valve Ampex 600 doesn't precisely help HF). Anyway, a couple of thoughts: newer preamps with high output and thinner sound than all valve equipment would make thigs better. Plugged directly to the tascam 2488 it sounds far crispier, though less loud. Changing the ribbon (I'm currently using KitKat wrapping - perhaps not the best possible?) would also most certainly change the sound quality (in either direction), but I'm not sure about capacitor film. I've got a couple of old capacitor rolls from when I recapped my Ampex, but they seemed too thick. Cosmo, can you positively state that you are getting good high end with your 5 micron ribbon? There must be a definite answer to the lack of HF here, and I think it is a combination of ribbon tension (got that nailed) and ribbon thickness. what do you guys think?
 

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