Khron

Re: Pronomic SCM-1
« Reply #40 on: July 13, 2018, 06:06:33 PM »
Those output transistors, have you replaced them? Or were they just hand-soldered (or hand-reworked) at the factory?

That source resistor on the edge of the board makes (more) sense,  since the bias varies with each individual JFET...

Received, inside photos.
I'll do better photos later with Nikon.


Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans


JuanV

Re: Pronomic SCM-1
« Reply #41 on: July 14, 2018, 05:07:23 AM »
I did not replace anything, it's stock photo after delivered to me.

e.oelberg

Re: Pronomic SCM-1
« Reply #42 on: July 16, 2018, 02:14:21 PM »
With a cutter you can remove the pronomic sign without scratches

ln76d

Re: Pronomic SCM-1
« Reply #43 on: July 17, 2018, 10:54:16 AM »
With a cutter you can remove the pronomic sign without scratches

Nitro solvent is much easier and safer to remove logo ;)

e.oelberg

Re: Pronomic SCM-1
« Reply #44 on: July 17, 2018, 11:35:58 AM »
Nitro solvent is much easier and safer to remove logo ;)
true :)

I did a couple of test with the mic but I didn't compare, usually i get annoyed of the sound of mics after a while. For instance  MBHO or Rode or Oktava or this very same mic with the old capsule. But with the new capsule I must admit, I like  them very much. They sound like no need for any eq to my ears.
« Last Edit: July 17, 2018, 02:32:16 PM by e.oelberg »

RuudNL

Re: Pronomic SCM-1
« Reply #45 on: July 17, 2018, 04:10:09 PM »
I still want to measure and compare the Banzai "KM84" capsule and the Pronomic.
But busy, busy, busy...
There is a solution for every problem!

http://www.vansteenisaudio.nl

RuudNL

Re: Pronomic SCM-1
« Reply #46 on: Today at 07:34:58 AM »
I finally measured the "Banzai" capsule and the (new) Pronomic capsule.
The frequency response matched almost exactly! ( A centimeter difference in position can already make a difference.)
So I have the impression that they are made by the same manufacturer.
There is a solution for every problem!

http://www.vansteenisaudio.nl

JuanV

Re: Pronomic SCM-1
« Reply #47 on: Today at 08:03:09 AM »
So update pronomic mic with Banzai PCB (not available i guess) can do some improvements ?

Re: Pronomic SCM-1
« Reply #48 on: Today at 08:41:39 AM »
So update pronomic mic with Banzai PCB (not available i guess) can do some improvements ?
I think the capsule is the important part. So buying a similar capsule to the Banzai one and installing it on an older Pronomic SCM-1 would be an improvement. The PCB would probably be less so because it seems that the capsule was the problem (or rather a bright installed in a circuit with no HF de-emphasis). Because the new SCM-1 is very balanced/neutral it's probably that the Banzai capsules are designed to be really flat sounding. Unless the new mics have a new circuit with HF de-emphasis but then why change the capsule?

RuudNL

Re: Pronomic SCM-1
« Reply #49 on: Today at 08:57:05 AM »
Circuit of the "old" and "new" Pronomic microphones is (almost) the same.
The old ones had a trimpot to adjust the FET bias.
But both microphones are based on the "Schoeps" circuit, with a DC/DC converter for the polarisation voltage.
If Banzai is planning to sell the capsules separately (I think he mentioned this already), this capsule would be a great update for the "old" Pronomic or Takstar CM-60 microphones.
There is a solution for every problem!

http://www.vansteenisaudio.nl


JuanV

Re: Pronomic SCM-1
« Reply #50 on: Today at 10:11:45 AM »
I thought replace pronomic PCB with Banzai PCB with transformer - different circuit. Without changing capsule. But i do not know if banzai circuit is better than pronomic.

RuudNL

Re: Pronomic SCM-1
« Reply #51 on: Today at 11:51:22 AM »
The Banzai circuit is the original Neumann KM84 circuit.
Personally I wouldn't go through all this trouble (expensive transformer!), because the stock Pronomic SCM-1 is good as it is.
(Anyway for me...  A transformer doesn't add quality, I prefer a transformerless circuit.)
There is a solution for every problem!

http://www.vansteenisaudio.nl

e.oelberg

Re: Pronomic SCM-1
« Reply #52 on: Today at 11:58:27 AM »
I agree with Ruud. The mic sounds just fine. Btw a Schoeps also sounds fine and  has no transformer. One of my mics needed a pcb wash and I will bias the FET if I have time. I guess  the Banzai capsule and the new pronomic are identical ...

Re: Pronomic SCM-1
« Reply #53 on: Today at 01:16:36 PM »
The Banzai circuit is the original Neumann KM84 circuit.
Personally I wouldn't go through all this trouble (expensive transformer!), because the stock Pronomic SCM-1 is good as it is.
(Anyway for me...  A transformer doesn't add quality, I prefer a transformerless circuit.)

RuudNL,

Some time ago I published a Transformerless KM-84 schenmatic on the MicBuilders forum, if you want to give it a look.

https://groups.yahoo.com/neo/groups/micbuilders/files/Homero%20Leal%27s%20Files/Transformerless%20KM-84%20Refresh/


It works pretty well. I also have some PCBs left for BM-800/700 or MXL mic bodies,  if some want to try it.

Regards!

HL


 

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