Kenwood L-07M info needed please

georgehifi · 29th March 2006, 05:38 AM

I have a pair but alas no circuit diagram, they are both working fine and show good 50k square waves stable on the scope and have equal low noise, but one is warm and the other is cool, so i need to do a bias adjustment, and also dc offset adjustment.

I've found 3 pots on the input/driver board, which I have no idea which ones what. One has to be for bias which i need to do, the other for DC offset which i also need to do and the third I have no idea what it does.
Does anyone have the info or a diagram on which does what. It's so dark and dingy down in there and cramped, I can't even see the emitter resistors so i can check the bias across them.

Your help will be grateful
Cheers George

MikeBettinger · 29th March 2006, 04:13 PM

I might have one, I'll look when I get home.

georgehifi · 29th March 2006, 09:53 PM

That would be great Mike, I've sent you a PM so you have my email, save trying to post, with the 100k limit.
Just found out that it has to go through the administrators to get to you, I'll give it a go.
Cheers George

MikeBettinger · 30th March 2006, 12:42 PM

George,

I have manuals for both the L-07M and the L-07M II. I did not receive a PM. The adjustments include: VRe1, fine offset adj; VRe2, course offset adj; VRe3, bias adj. The major differences between the two models appears to be the II version went to higher frequency outputs, they went to a double Darlington from a tripple and the bias compensation went from six diodes to one, with changes to the trimmer values.

Regards, Mike.

tvi · 30th March 2006, 01:29 PM

Just uploaded the sevice manual and a seperate schematic at
www.sharefx.com

Regards
James

georgehifi · 30th March 2006, 07:37 PM

Thanks Mike, that will get me out of trouble.

And thanks for the link James will d/l, good site to have in favourites.

Cheers George

anatech · 30th March 2006, 09:16 PM

Hi James,
I just had a look on the link, couldn't find the information. Does it disappear when someone downloads it?

-Chris

clem_o · 31st March 2006, 03:38 AM

Chris,

It's there. The default filter is set to "today", just set it to "all", ctrl-f to look for "L-07".

Cheers

Clem

ps: I haven't figured out how to download though... but I use Opera, it doesn't seem to work with some sites...

anatech · 31st March 2006, 01:22 PM

Hi Clem,
Thanks very much for the hint.

The rest is easy, register. A bit on the right you will seen a kind of down arrow, click it and the PDF opens in a new window.

So I did find and download the manual. A little unclear but way better than nothing.

James,
Thank you.

-Chris

clem_o · 1st April 2006, 01:36 PM

Quote:

Originally posted by anatech

Thanks very much for the hint.

The rest is easy, register. A bit on the right you will seen a kind of down arrow, click it and the PDF opens in a new window.

Hi Chris,

Your welcome. So, how many heads does it take to download a PDF... :-) :-) :-)

James, many thanks for the link, I think it will come in handy...

Cheers

Clem

29th March 2006, 05:38 AM	#1
georgehifi diyAudio Member Join Date: Sep 2003 Location: Manly Australia (Jewel of the Pacific)	Kenwood L-07M info needed please I have a pair but alas no circuit diagram, they are both working fine and show good 50k square waves stable on the scope and have equal low noise, but one is warm and the other is cool, so i need to do a bias adjustment, and also dc offset adjustment. I've found 3 pots on the input/driver board, which I have no idea which ones what. One has to be for bias which i need to do, the other for DC offset which i also need to do and the third I have no idea what it does. Does anyone have the info or a diagram on which does what. It's so dark and dingy down in there and cramped, I can't even see the emitter resistors so i can check the bias across them. Your help will be grateful Cheers George __________________ Avatar : Production Lightspeed Attenuator www.lightspeedattenuator.com

29th March 2006, 09:53 PM	#3
georgehifi diyAudio Member Join Date: Sep 2003 Location: Manly Australia (Jewel of the Pacific)	That would be great Mike, I've sent you a PM so you have my email, save trying to post, with the 100k limit. Just found out that it has to go through the administrators to get to you, I'll give it a go. Cheers George __________________ Avatar : Production Lightspeed Attenuator www.lightspeedattenuator.com

30th March 2006, 07:37 PM	#6
georgehifi diyAudio Member Join Date: Sep 2003 Location: Manly Australia (Jewel of the Pacific)	Thanks Mike, that will get me out of trouble. And thanks for the link James will d/l, good site to have in favourites. Cheers George __________________ Avatar : Production Lightspeed Attenuator www.lightspeedattenuator.com

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Trio (Kenwood) DP-1000, Any info?	GJF	Digital Source	61	3rd January 2013 06:28 PM
A mint Kenwood KA-907 amp is arriving, I need help/info/advice on restoring it.	Kuja	Solid State	5	21st November 2011 11:46 PM
Seeking info: researching the Trio Kenwood L-07D for a magazine article	Triophile	Analogue Source	4	9th August 2009 05:42 AM
Kenwood Power AMP KM-X1 transformer info	space2000	Solid State	0	21st June 2008 11:08 AM
Info needed on this very rare Kenwood deck	Kuja	Analogue Source	0	29th September 2006 02:19 PM


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

29th March 2006, 04:13 PM	#2
MikeBettinger diyAudio Member Join Date: Jan 2006 Location: Virginia	I might have one, I'll look when I get home.

30th March 2006, 12:42 PM	#4
MikeBettinger diyAudio Member Join Date: Jan 2006 Location: Virginia	George, I have manuals for both the L-07M and the L-07M II. I did not receive a PM. The adjustments include: VRe1, fine offset adj; VRe2, course offset adj; VRe3, bias adj. The major differences between the two models appears to be the II version went to higher frequency outputs, they went to a double Darlington from a tripple and the bias compensation went from six diodes to one, with changes to the trimmer values. Regards, Mike.

30th March 2006, 01:29 PM	#5
tvi diyAudio Member Join Date: Apr 2001 Location: Moonee Ponds, Vic, Australia	Just uploaded the sevice manual and a seperate schematic at www.sharefx.com Regards James

30th March 2006, 09:16 PM	#7
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi James, I just had a look on the link, couldn't find the information. Does it disappear when someone downloads it? -Chris

31st March 2006, 03:38 AM	#8
clem_o diyAudio Member Join Date: Jun 2005 Location: Manila	Chris, It's there. The default filter is set to "today", just set it to "all", ctrl-f to look for "L-07". Cheers Clem ps: I haven't figured out how to download though... but I use Opera, it doesn't seem to work with some sites...

31st March 2006, 01:22 PM	#9
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Clem, Thanks very much for the hint. The rest is easy, register. A bit on the right you will seen a kind of down arrow, click it and the PDF opens in a new window. So I did find and download the manual. A little unclear but way better than nothing. James, Thank you. -Chris

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read