Rode K2

[RuudNL]

A friend of mine has a non working Rode K2 microphone.
To repair it, a schematic diagram would be very helpful.
Any hints?

 

[ln76d]

I never found schematic online, but i had luck with repair - main problem was cold joint.
You could try ask rode for schematic for self repair ( i would start with local service or choose in contact form country where is no rode offical dealer)  - maybe it wouldn't be a problem?!?
If you will have a luck i'll be happy if you could share it here or on PM

http://www.rode.com/contact

 

[Gus]

Kevin's old place had a copy of my hand drawn schematic, I forget the URL, anyone remember the URL?
The schematic might still be on a hard drive in an retired PC in my basement
A hint is think upside down for the DC voltages when you see the schematic it will make sense

 

[ln76d]

You mean this one:

http://www.diyfactory.com/

? ? ?
It's not working  :-\

or this one:

http://www.celestial.com.au/~rosswood/diy.htm

? ? ?

maybe this one:

https://www.facebook.com/HomeAloneMovie?fref=ts

? ? ?


Don't know any other Kevin sites.

 

[RuudNL]

The schematic might still be on a hard drive in an retired PC in my basement

Hi Gus, I scanned through this site and found that you have been working on this microphone.
But I can imagine that it might be too much work to 'dig it up'?!

 

[Gus]

I will look for it later today

EDIT from the wayback machine
http://web.archive.org/web/20100811083829/http://www.diyfactory.com/projects/gus/ntkmods.htm

Note I would now leave all the caps alone (maybe I made it worse).  Maybe change the electros if you feel you need to.
Note the K2 marking on the PCB.

I changed the 6dj8 type tube to a 12ay7 (changed the heater wiring on mine) Before this I tried a number of 6dj8 type tubes.
Not much changed if anything sound wise.

Someone should check if I traced the circuit correctly.

I think it is clever how the voltages are set up.

 

[micaddict]

ECC88.

Yet another tube designed by Philips. 

6DJ8 was the Amperex designation.

 

[micaddict]

This GDIY thread is over ten years old:

http://groupdiy.com/index.php?topic=12073.0

And Gus was there, of course. 

 

[RuudNL]

This GDIY thread is over ten years old:

http://groupdiy.com/index.php?topic=12073.0

And Gus was there, of course. 

I found that thread already. (That's how I knew that Gus had worked on one!)

 

[micaddict]

Yeah, could 've guessed. 

Oh well, now others can read it, too. 

 

[Jakub W]

I will look for it later today

EDIT from the wayback machine
http://web.archive.org/web/20100811083829/http://www.diyfactory.com/projects/gus/ntkmods.htm

Note I would now leave all the caps alone (maybe I made it worse). Maybe change the electros if you feel you need to.
Note the K2 marking on the PCB.

I changed the 6dj8 type tube to a 12ay7 (changed the heater wiring on mine) Before this I tried a number of 6dj8 type tubes.
Not much changed if anything sound wise.

Someone should check if I traced the circuit correctly.

I think it is clever how the voltages are set up.

I also need to fix this mic and I’m looking for the value of the resistor on the PCB where the lends are connected (R1). I found a schematic, where the value is written down as 3 G. Does it really mean 3 Gohms?