PS: I noticed that the right channel sounded lower than the left channel. Once the measurements were made, Bias was only at 10mA. I raised it up to 15.50 mA, same as left channel. Now it sounds balanced.
Attachments
Sakis did a great job, amp sounds good, more musical and powerful than original. Thank you everybody.
Let’s start by saying what I know about electronics would easily fit in a thimble. Having said that, I have a Kenwood KA - 5700 Stereo Integrated Amplifier. I bought it in 1976 from a friend and I don’t want to part with it. I was cranking out the jams loud about a year ago when it quit working and I could smell burning. I put off looking at it because I’m not good with electronics. So, today I decided to sell the entire system “as-is”. Took pics and lastly popped the top on the amp to see if I could see what burnt. Found it. It looks like a diode to me. Was wondering if this would be hard for a “greenie” to fix. If so, do you know where I could get parts? If not, could you give me an estimate on what an as-is price would be for all three units.
pics attached.
thanks in advance.
pics attached.
thanks in advance.
Attachments
It is really difficult working from pictures. I assume we are talking of one of those four 'glass' diodes in the bridge. If so then you just might get lucky.
I would say... you should do one simple check first and that is to measure each of the four output transistors in circuit and just make sure none read dead short. Set your meter on 'diode' range and measure from the middle pin to each of the end pins. If any read short then we have to say that the repair is probably beyond your abilities.
If they are not short then its worth trying replacing the diode, ideally all four. You should also measure the diodes to see if any are short.
Replacing with something like a IN5408 type (a 3 amp 1000v part) which are ancient and cheap would tell you if it was all going to work. Available from any component supplier (do not buy off eBay, to many duff and fake parts around). A local repair shop in your area might even have something suitable, they cost peanuts. You need a voltage rating of at least 200 volt for the diode and a minimum of 3 amp.
I would say... you should do one simple check first and that is to measure each of the four output transistors in circuit and just make sure none read dead short. Set your meter on 'diode' range and measure from the middle pin to each of the end pins. If any read short then we have to say that the repair is probably beyond your abilities.
If they are not short then its worth trying replacing the diode, ideally all four. You should also measure the diodes to see if any are short.
Replacing with something like a IN5408 type (a 3 amp 1000v part) which are ancient and cheap would tell you if it was all going to work. Available from any component supplier (do not buy off eBay, to many duff and fake parts around). A local repair shop in your area might even have something suitable, they cost peanuts. You need a voltage rating of at least 200 volt for the diode and a minimum of 3 amp.