Just bought a P -k47!

  • Thread starter Thread starter docmattic
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Right - but if you look a docmattic's posts above he says he is replacing the capsule and the transformer, and is doing the Royer mod, which means he's replacing the solid-state V67 headamp also. So what's left? - body tube, connector and head basket.

as i've been schooled by folks like philgood and michael joly, the body tube and the headbasket are actually important parts of the equation :)
 
as i've been schooled by folks like philgood and michael joly, the body tube and the headbasket are actually important parts of the equation :)
I can't imagine the body tube playing a significant part in the sonic quality of the mic, as long as you don't have any spurious vibrations or resonances. The headbasket in condenser mics I've had apart is pretty well isolated from the body cavity.

The design and construction of the headbasket/grille apparently does make a difference, but who is to say what this contributes to the MXL V67 sound. With all the variables in docmattic's proposed mods above, I doubt this would contribute any audible difference in the mic.

But I'm no expert - just my thoughts. Just hate to see him destroy a useable mic.
 
yeh i was thinking that. the mic isnt "bad" i just wanted it to sound like the best mic i can get it too. Its not going to hurt though to change some things in the circuit first, if i dont like it then i can always do the royer mod. :rolleyes:

deffinatly changing the capsule thought. over time (i left it in the mic stand in my room all the time) spit got into the capsule and i guess particles of deoderant got in aswell and stuff like that. it definetly isnt as detailed and likeable as it used to be. WEn i opened it up to have a peek i could see spots on it which looked like stuff had got in. so i decided i will be replacing the capsule.

What are the main caps to replace? i know all their values

is it worth replacing the transistors? ive heard they make the mic distort earlier than it could.
 
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Wow,, those are some great pics. Would you mind if I were to drag and drop into the PSW forum? If I am not mistaken Tab Funk is Oliver (on PSW)
 
docmattic

I don't understand why you are doing a Royer mod to a MXL V67. This is a mic many folks like unmodded. If you are basically going to gut the mic (replace capsule, transformer and circuit), why not get a cheaper mic to use as the shell to hold your components, instead of destroying a useable mic.

I'd suggest if you want to mod the 67, just replace a few key caps and maybe the transformer.

Buy some other cheapie to do the Royer md:
http://www.musiciansfriend.com/product/Nady-SCM-900-Condenser-Mic?sku=277123
http://www.musiciansfriend.com/product/MXL-MXL-909-Vocal-Condenser-Microphone?sku=273100

Not trying to tell you what to do - just a suggestion. :)

LOL! Those mics deserve to be gutted!:D

I'm afraid I'd have to agree here. The V67 is a very well liked mic. Could always be better, but why not leave it as is? The only reason I ever modded the V67's I have with the Royer mod is that I wanted tube mics that looked had the gold grill.:) I eventually painted the bodies because I hate the green paint they have on them. I will probably get a working V67 just to have. The best mod IMO for the V67 alone is to replace any ceramic caps in the signal path. They used to have a ceramic 1000pF on the backside of one circuit board where the capsule stand-offs are. If you replaced it with a 1000pF polystyrene it made a big improvement on the top end.
 
LOL! Those mics deserve to be gutted!:D

I'm afraid I'd have to agree here. The V67 is a very well liked mic. Could always be better, but why not leave it as is? The only reason I ever modded the V67's I have with the Royer mod is that I wanted tube mics that looked had the gold grill.:) I eventually painted the bodies because I hate the green paint they have on them. I will probably get a working V67 just to have. The best mod IMO for the V67 alone is to replace any ceramic caps in the signal path. They used to have a ceramic 1000pF on the backside of one circuit board where the capsule stand-offs are. If you replaced it with a 1000pF polystyrene it made a big improvement on the top end.

what tollerence is best for the caps?
 
what tollerence is best for the caps?

Well, +/- 5% would be best, but you could go +/- 10%. Tollerance isn't nearly as important as type. You want good film caps. Much more linear than ceramics.
 
docmattic

I don't understand why you are doing a Royer mod to a MXL V67.

This is a very sensible suggestion. The MXL67 problem is a wrong operating point for the emitter follower. Just re-bias it, stuff with good quality parts and it will be a fine mic on its own.

As a basis for a Royer I'd use some tube mic--so much less chance to screw up something, and also you'd have a ready made PSU, cable, XLR, etc.

RightonMusic,

If you'd take the tube out and make a clear picture of the backside traces I could reverse the schematics and tell you exactly which cap is that.

Huh, the tube positioning does not make any sense. I'd start with that part.

Best, M
 
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This is a very sensible suggestion. The MXL67 problem is a wrong operating point for the emitter follower. Just re-bias it, stuff with good quality parts and it will be a fine mic on its own.

As a basis for a Royer I'd use some tube mic--so much less chance to screw up something, and also you'd have a ready made PSU, cable, XLR, etc.

RightonMusic,

If you'd take the tube out and make a clear picture of the backside traces I could reverse the schematics and tell you exactly which cap is that.

Huh, the tube positioning does not make any sense. I'd start with that part.

Best, M

You need to pop in more often Mark.
 
This is a very sensible suggestion. The MXL67 problem is a wrong operating point for the emitter follower. Just re-bias it, stuff with good quality parts and it will be a fine mic on its own.

As a basis for a Royer I'd use some tube mic--so much less chance to screw up something, and also you'd have a ready made PSU, cable, XLR, etc.


Best, M

yeh well sounds like a good idea. so is rebiasing the emmitter follower as simple as replacing parts?
(refering to the part ive bolded) so would replacing every cap and transistor do anything useful? or just the 2 main caps?

(and i thank people for answering my somewhat stupid questions, im learning a great deal.:))
 
yeh well sounds like a good idea. so is rebiasing the emmitter follower as simple as replacing parts?

Well, there are many different ways of doing that. I completely change the schematics, all together. But it is also possible to do it much simpler. It would involve bypassing blocking cap and emitter resistor, and inserting a biasing resistor into collector rail.

(refering to the part ive bolded) so would replacing every cap and transistor do anything useful? or just the 2 main caps?

You don't have to replace transistor. Upgrading caps for better quality is always a very good idea. On top of that relam the transformer and away ya go.

Best, M
 
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Just bought a Pk-47?

I swear to god at first I thought this was a gag posting in the rap/hip-hop forum, along the lines of "how well would a PK47 complement my Uzi?"

:D
 
Marik

don't give design away for free.
As opposed to the free and open sharing of information and helpfulness of luthiers, it has always impressed me how curmudgeonly and miserly microphone folks can be (Harvey, Marik and Michael Joly being notable exceptions.)

I can see someone who makes a living from it keeping trade secrets, but not an amateur diy'er keeping a shroud over a mic mod (that's not even yours) with really no potential for income.

You, Mr. Gus, certainly seem to be a niggardly type. That's fine for you, but we don't need you telling other folks here to emulate your outlook.
 
Marik

don't give design away for free.

OK. From now on I'm going to charge for all the drum advice I give, double for the little tricks I've developed. And I'm going to play with my back to the audience when I play guitar and start doing a riff I invented.

Geez, Gus...why are you even on these forums? Just patent everything you do and shut the hell up if you aren't going to be of any use!!

Ambiguous posts are not good posts at all (and I've been looking at your posts on other furoms "There's something else to do, but I can't tell you":rolleyes:).
 
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