TRIO / KENWOOD L-05M Monoblocks Repair Thread

poynton · 31st July 2007, 04:19 PM

Hi.

I have just been given a pair of these by Coliny from Derby, UK.

One is faulty with DC on the output, the other is fine.

As they are both in excellent condition for their age, I intend to repair them (if possible) and to document the repair.

I have the circuit diagrams.

The first thing is to obtain a source for the output transistors which are a 'special' type - 2SC2337 and 2SA1007.

These are described as 'Emitter-Ballasted Transistors' (EBT's).

Has anyone else any experience of these amps?

Andy

WALTER BURKHARD · 2nd August 2007, 06:13 AM

http://eshop.euras.com/geraetesuche....00&login=25808

WALTER BURKHARD · 2nd August 2007, 06:15 AM

maybe here

http://www.huskyintl.com/parts/2.htm

WALTER BURKHARD · 2nd August 2007, 06:18 AM

For 2SC1494 u can used NTE320

WALTER BURKHARD · 2nd August 2007, 06:21 AM

Or BLW60 -VHF Power Transistor from Philips Semiconductors

ilimzn · 2nd August 2007, 11:07 AM

I'm not sure but i think i remember one of the restorers of vintage gear at www.audiokarma.org having some experience with these. maybe you should ask there?

31st July 2007, 04:19 PM	#1
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	TRIO / KENWOOD L-05M Monoblocks Repair Thread Hi. I have just been given a pair of these by Coliny from Derby, UK. One is faulty with DC on the output, the other is fine. As they are both in excellent condition for their age, I intend to repair them (if possible) and to document the repair. I have the circuit diagrams. The first thing is to obtain a source for the output transistors which are a 'special' type - 2SC2337 and 2SA1007. These are described as 'Emitter-Ballasted Transistors' (EBT's). Has anyone else any experience of these amps? Andy

2nd August 2007, 06:13 AM	#2
WALTER BURKHARD diyAudio Member Join Date: Dec 2002 Location: Helsinki	spare parts http://eshop.euras.com/geraetesuche....00&login=25808

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2nd August 2007, 06:15 AM	#3
WALTER BURKHARD diyAudio Member Join Date: Dec 2002 Location: Helsinki	maybe here http://www.huskyintl.com/parts/2.htm

2nd August 2007, 06:18 AM	#4
WALTER BURKHARD diyAudio Member Join Date: Dec 2002 Location: Helsinki	For 2SC1494 u can used NTE320

2nd August 2007, 06:21 AM	#5
WALTER BURKHARD diyAudio Member Join Date: Dec 2002 Location: Helsinki	Or BLW60 -VHF Power Transistor from Philips Semiconductors

2nd August 2007, 11:07 AM	#6
ilimzn diyAudio Member Join Date: Feb 2005 Location: Zagreb	I'm not sure but i think i remember one of the restorers of vintage gear at www.audiokarma.org having some experience with these. maybe you should ask there?