Capacitor replacement / hiss advice

JdAo · 24th December 2011, 01:00 PM

Hello. I love this site and been spying for a while

Only knowing some electricity basics and practically none electronic stuff, what would be the best replacement for a ECET71R103Y (10000uf Panasonic capacitor) ? I find that today's similar value caps are much smaller.
Also what's the best way to know when capacitors need replacement, I've read that when their top becomes slightly oval they're at they're end of life, does that depend only on power on hours or also age ?
Also, my has some hiss which from my search might be some transistors somewhere. This is kinda scary for me because the amp I'm servicing is like new despite being almost 30 years old and it would be stupid to even scratch it, and there are many transistors in there, how do I find the culprit ? Could this be consistent with the fact that when I turn up the volume to high levels there are some times huge crack and pop noises (more frequent the higher the volume is, if it's way up it will happen for sure, didn't turn it even more cause it almost seems like small gun shoots

), which can be caused by too old transistors too ?
I've also seen somewhere (youtube actually, I know it's not too popular in here but there are bad and good videos I guess...

) that the hiss could also be caused by bad resistors.
Thanks and love the site, it's the best one of the kind with very knowledgeable members, just hope some pop up.
Merry Christmas to all!

DF96 · 24th December 2011, 02:34 PM

Hiss in a 30 year old amp could be a faulty resistor. To fault-find an amp you need the circuit diagram, the ability to read it, and some test equipment (minimum, a DVM).

JdAo · 24th December 2011, 05:31 PM

Maybe I can start checking the amp somewhere (suggestions accepted) and post here the schematics as we go, that would be awesome.
Reread my post and forgot to say what amp it is! It's a good old Technics SE-A5, before the plastic era

I managed to find the service manual. I can read simple schematics by checking what the simbols mean, but I the complicated stuff like in the service manual is hard for me.
A digital volt meter I can get easily or borrow, as well as other stuff.

What about the capacitors ?

Thanks

Conrad Hoffman · 24th December 2011, 08:36 PM

Just the article for you here.

24th December 2011, 01:00 PM	#1
JdAo diyAudio Member Join Date: Dec 2011	Capacitor replacement / hiss advice Hello. I love this site and been spying for a while Only knowing some electricity basics and practically none electronic stuff, what would be the best replacement for a ECET71R103Y (10000uf Panasonic capacitor) ? I find that today's similar value caps are much smaller. Also what's the best way to know when capacitors need replacement, I've read that when their top becomes slightly oval they're at they're end of life, does that depend only on power on hours or also age ? Also, my has some hiss which from my search might be some transistors somewhere. This is kinda scary for me because the amp I'm servicing is like new despite being almost 30 years old and it would be stupid to even scratch it, and there are many transistors in there, how do I find the culprit ? Could this be consistent with the fact that when I turn up the volume to high levels there are some times huge crack and pop noises (more frequent the higher the volume is, if it's way up it will happen for sure, didn't turn it even more cause it almost seems like small gun shoots ), which can be caused by too old transistors too ? I've also seen somewhere (youtube actually, I know it's not too popular in here but there are bad and good videos I guess...) that the hiss could also be caused by bad resistors. Thanks and love the site, it's the best one of the kind with very knowledgeable members, just hope some pop up. Merry Christmas to all!

24th December 2011, 08:36 PM	#4
Conrad Hoffman diyAudio Member Join Date: Mar 2007 Location: Canandaigua, NY USA	Just the article for you here. __________________ I used to be an audiophool like you but then I took an arrow to the knee.

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
B&W Capacitor Replacement- Need Help	Ckyguy68	Multi-Way	18	8th February 2011 03:28 AM
Please Help with capacitor replacement	hearingisbelieving	Solid State	3	3rd December 2009 11:36 PM
Capacitor Replacement - HELP PLEASE!	SoundQuest	Solid State	1	2nd April 2008 12:36 AM
Multisegment capacitor replacement help.	Frazzled	Tubes / Valves	6	19th February 2007 02:33 AM
Capacitor replacement	bulgin	Solid State	11	2nd August 2006 09:08 PM

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


	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

24th December 2011, 02:34 PM	#2
DF96 diyAudio Member Join Date: May 2007	Hiss in a 30 year old amp could be a faulty resistor. To fault-find an amp you need the circuit diagram, the ability to read it, and some test equipment (minimum, a DVM).

24th December 2011, 05:31 PM	#3
JdAo diyAudio Member Join Date: Dec 2011	Maybe I can start checking the amp somewhere (suggestions accepted) and post here the schematics as we go, that would be awesome. Reread my post and forgot to say what amp it is! It's a good old Technics SE-A5, before the plastic era I managed to find the service manual. I can read simple schematics by checking what the simbols mean, but I the complicated stuff like in the service manual is hard for me. A digital volt meter I can get easily or borrow, as well as other stuff. What about the capacitors ? Thanks

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)