hello..I'm trying to understand this.
lets say we have 2 amps and its gonna be like a shoot out or sound comparison.
both are identical solid sate type except for the power amp section.

amp A has LM3886t(found out about this when repairing Vox AD30VT yesterday)

amp B has maybe 2 BD909 or combination of 2 PNP+NPN power transistors that will produce the same watts as amp A.

Thank you all.


one more
what is equivalent to BD909(saw in laney hc30r schematic)

Hello to all,its been a while..I almost forgot my password on the way here..again I need help sourcing the mentioned subject.I've emailed them but no reply..and again I'm being chase by the client.

wow!!!more schematic  ,my schematics collection are piling up fast,pretty soon might need a bigger hard disc.

long live the contributors.

hello,JM Fahey

I'm so sorry for the very late reply,I was a bit busy.it was the return input problem,problem solved.
Thanks Again

your copy on its way.

Quote from: J M Fahey on June 09, 2008, 02:44:32 PM
Dear yustech. Write them (HK), include the serial number; 99% they´ll email you a schematic. Then you post it here and start asking whatever help some of us can give you. ¿Can you solder, read schematics, use a multimeter? Bye.

hello J M Fahey,
got the schematic,thanks.post the schematics here?won't they(HK) know,I don't mean to be selfish,i love to share,i'm a amptech myself(beginner that is).i sure need all the help i can get.anyway how do i do that(post schematic here?) 

Quote from: teemuk on June 09, 2008, 08:03:58 AM
I haven't seen any schematics to that series online. Have you tried contacting H&K?

thanks,i've email them and they replied within 30min,with schematic attached,now i could repair the amp.thanks again.

Quote from: sugrhigh on February 04, 2008, 10:10:46 PM
I also posted this in the preamp section, hope that's okay...

basically it's a tiny preamp that can be built for less than $10 bucks ($15 if you go to Radioshack) that sounds nice but is extremely compact (my test PCB measured 1" x 1") that can be the backbone of MANY audio projects so check it out..... but read on if you want to know more!

On to the good stuff!
Well I have recently fallen in love with a little chip called the LM386 which costs only $.30...
yes 30 CENTS
so bought 20 of them to experiment with (not just audio stuff).

Chip Jr. (the name of the design, Chip Sr. is coming later) is a SMALL amp.
I did a test board that measure 1" x 1" yet sounds rather nice.
It has only 5 parts to it unless you decide to do some of my travel amp mods (on my site)

as always... check out the blog!

thanks,i'll give it a try.

Quote from: teemuk on June 08, 2008, 06:49:35 PM
In case you don't have it yet...
http://www.traynoramps.com/downloads/servman/smtrayint.pdf

Thanks a lot.its a big help to a small time amp repairer such like me..

hello fellow forumer,i'm new to this forum thing,i dont know where to put this.I need some help,i have this H&K Attax 40 arrive for repair.wondering anyone has schematic or direct me to the site that has it.
Thank you and god bless you all.

Quote from: teemuk on November 02, 2007, 08:32:45 AM
http://www.westebbe.com/Vox/AD15_30Servicemanual.pdf

thanks a lot.those new voxs schematic are very hard to find.
Thanks again..