Advice on Peluso p67 mod?(Love the Du67 project! I should have done that!)

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As you can see below, my circuit is mostly the same, important things are marked red and C3 you can try 10uF.

For the parts on  original circuit of M49C
https://dl.dropboxusercontent.com/u/43869772/D-M49BC/Build%20Folder%20M49c/M49C%20Schematic.bmp

Don't use R3, C3, R4 - it's low end filtering feedback which isn't needed it's a part of "broadcasting" filter.
You will then get something between first M49 and C version.
C1 use 3.3pF as i mentioned earlier on this thread.
C4 (C2 on my schematic) is usefull feature - it's a feedback capacitor which improves circuit linearity.
After P67 mods - you can try to ad this capacitor in P67 and check how it behave - it's worth to try from 3.3pF - 10pF values.
This capacitor you can solder directly on tube socket pins.
 

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ln76d said:
As you can see below, my circuit is mostly the same, important things are marked red and C3 you can try 10uF.

For the parts on  original circuit of M49C
https://dl.dropboxusercontent.com/u/43869772/D-M49BC/Build%20Folder%20M49c/M49C%20Schematic.bmp

Don't use R3, C3, R4 - it's low end filtering feedback which isn't needed it's a part of "broadcasting" filter.
You will then get something between first M49 and C version.
C1 use 3.3pF as i mentioned earlier on this thread.
C4 (C2 on my schematic) is usefull feature - it's a feedback capacitor which improves circuit linearity.
After P67 mods - you can try to ad this capacitor in P67 and check how it behave - it's worth to try from 3.3pF - 10pF values.
This capacitor you can solder directly on tube socket pins.
Click to expand...


Oh very nice!  I will try this in mine!  I am going to try one of Dany's capsules as well.  D7.

Even though I won't get the same exact sound of the old m49, I think I'll get in that territory and get a nice mic, and I won't have to pay 4000 for it!  Like the many copies out there.  I do want to try du67 kit... thats a great mic I hear.
 
Thank you for all of your help.  I will attempt some of these mods soon, and see how they work.  Thank you!  Do you have any mics you built and sound clips?  I'd love to hear them.
 
Yes i have :)
I build and mod a lot, some of them found new owners but some still have or rebuilding.
I need to finish three microphones and then i will make simple sound samples of 5 or more.
Right now i can only make voice samples, but if i'll be able to run my own studio in (let say) 2-3 months there will be alot of deifferent sound samples :)
 
But you might get older if you sleep now and then.
In a healthier way to boot.
That's building time regained.  :D

Not complaining, mind.  ;D
 
I'll be young forever ;)

Back to the main topic!

Today i did test on my S16 - using 6AK5.
I found really great, nos military stock of 5654 - which is exactly 6AK5W - better quality made for army.
I probably will drop few into black market, to give a chance to other microphone freaks, so if you would like modded microphone (really try different capsule as M7 (or dan D7) i highly recommend this tube. It's cheap and great.

One thing about transformer - i don't know what ratio Peluso used in P67, but if it's 7:1, you could try 10:1 - but this is to check later.
Really don't give up on this microphone ;)

 

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