Colin Wonfor

Above is the crook and is wife.

Hello all I hope you are all well.

Some of you want information on my new and old products plus odd bits.

They can all be found here, you will need to sign on then feel free to download. Odd and new  all new Yes all new

Have fun be safe enjoy the music.

20 minutes ago, Doktor said:

 

First of all, hello Colin.

 

I mentioned that post :

http://audiokarma.org/forums/index.php?threads/under-the-radar-amps.455411/#post-5864074

 . . . and you gave answer as you wrote here :

http://audiokarma.org/forums/index.php?threads/under-the-radar-amps.455411/page-5#post-5873961

OK.

You explained there all about that.

Thnx 4 tht.

 

Question 1. for you - who designed Magnum MP150 preamp and MF125 mono's ? 

Question 2. - which wire used in MP 150 and MF125 ?

 

Both were based on the MF250 and MP and MC 250 I did at Magnum.

Hello too

Setting bias I have learnt for FET amps is a bit hit or miss.

I load the amp with the current set to zero on the pre-set.

Then a 10KHz signal is plug in so the the 8 Ohm load RESISTOR has just 2 Volts Pk-Pk

You can then clearly see the Cross Over distortion on a scope.

Adjust the pre-set with care until the distortion is gone, keep a careful monitor of the heat sink temperature and it is best a a ambient of 25C

The Amp will sound amazing and run slightly warm and low levels.

I hope this helps?

Best Col

On 10/10/2012 at 10:17 PM, Okibokis said:

.My moderator to join the pictures, I could not have the other way to show.

Hi I did this design in the late 1970,s it is a Complementary Common Base stage the original chip had matched transistors , but when A.C Magnum and I parted Tony wanting to make more money replaced them, to be honest shit transistors without thermal sharing substrates , a bad move Relph.  Noise lept up and so did the distortion.

19 hours ago, Doktor said:

Two audio Magnum amplification and another who knows how sucks t and those of other Magnum's on the Mile. 

You probably unconsciously made synergy in the system:

" A. C. Magnum Ltd was founded by Tony Relph who was also one of the co-founders of Rega. Rega is the abbreviation of the names RElph and Gandy. Tony Relph went on to found A. C. Magnum. Tony Relph has since retired and these amplifiers are no longer manufacturer. Magnum used Colin Wonfor circuit designs and there was definitely some collaboration between Colin Wonfor and Tony Relph at the beginning. Maybe the company name was actually stands for Anthony. Colin. "

 

The above statement is not quite correct:-