Good morning.
I re capped my amps by changing out all 12 large psu caps and the two osc Board caps 18k each. Amps don't turn on .
Any ideas aside of fuses ?
I re capped my amps by changing out all 12 large psu caps and the two osc Board caps 18k each. Amps don't turn on .
Any ideas aside of fuses ?
Ty I took many pics before each part of disassemble. Tonight I'll check each part again
And I'll check fuses. Ty for the reply
And I'll check fuses. Ty for the reply
Keep in mind, if you did reverse a cap and power up, that cap is probably damaged. Anyway having a good look over it is usually the best place to start... Good luck!
Hahaha. Yes maybe I've done a few amps and take many pics and review when done before turn on. And yes I've caught mistakes as well.
I'll review all and verify again ty guys
I'll review all and verify again ty guys
Hi,
ML No.33 is designed by Mark Levinson.
ALRAINBOW The owner of the ML.No.33 Mono Blocks completely over hauled with brand new ultra high end parts. it is working like a new amp. Huge improvement in sound. Replaced 28 power supply caps made by United Chemicon and Cornell Dubilier and all the radial caps.
The only caps we are waiting from Cornell Dubilier factory is the 330uF/100V ultra Low ESR high ripple super expensive 301r331u100je2 these caps are replacing the original URZA (United Chemicon ultra Low ESR caps since Chemicon will not make those anymore. Cornell has better spec. The amp uses 24 of them for power supply.
He will reply soon.
Thanks
ML No.33 is designed by Mark Levinson.
ALRAINBOW The owner of the ML.No.33 Mono Blocks completely over hauled with brand new ultra high end parts. it is working like a new amp. Huge improvement in sound. Replaced 28 power supply caps made by United Chemicon and Cornell Dubilier and all the radial caps.
The only caps we are waiting from Cornell Dubilier factory is the 330uF/100V ultra Low ESR high ripple super expensive 301r331u100je2 these caps are replacing the original URZA (United Chemicon ultra Low ESR caps since Chemicon will not make those anymore. Cornell has better spec. The amp uses 24 of them for power supply.
He will reply soon.
Thanks
If you are embarking on recapping a working amp I always advocate replacing components one at a time and powering up after each one. If you make a boo boo it's obvious then.
You have probably never worked on a big amp as what you suggest is completely out of the question. A proper overhaul may take replacing hundreds of components. And it is often necessary to dismantle heatsinks in order to get access.
Just pay attention to what you are doing and all is well.
Congratulations to ALRAINBOW for a successful job.
Just pay attention to what you are doing and all is well.
Congratulations to ALRAINBOW for a successful job.
Agree, she's a big job and this would take a month of sundays. I usually go with "fix the biggest problem first", and then restore. But you don't need to stop and power up between each and every component replacement if the things working and you're using new, good components.
The ribbon cables used inside were the cause of one amp not turning on. They are very sensitive. I'm ordering new ones soon. A big thanks to renjy651 without him I would never be able to get the correct caps. The man is a capacitor god. The 330 Caps had to be made and a min order of 100 pcs was needed. I'll be selling off the bal of them when done after keeping a few Spares. I cannot say for certain anyone who did change all caps like I did. But I truly doubt it as this is a very long and exp process.
Thanks for the replies all.
Thanks for the replies all.
I've worked on and repaired many amp's over many years and always do overhauls in stages and check after each stage. Perhaps not on a cap by cap basis but always in stages so that the result of each stage can be observed. Particularly if the amp in question has a fault to begin with. Once I find the offending part/parts, I want to see the result of replacing them in a controlled power up. If you do a complete shotgun replacement and make a mistake (easy to do, I've done it) it makes tracking it down that much more difficult.
For the record the amps worked perfect Before
The amps are huge it takes hours to disassemble alone much play back and forth
What I did was this first all main psu caps and reg supplying caps this alone is 14 caps
Put it back and check and adjust some 14 test points cold and hot per amp
Then again take it apart and do the rest of the caps some 60 or so
The amps are huge it takes hours to disassemble alone much play back and forth
What I did was this first all main psu caps and reg supplying caps this alone is 14 caps
Put it back and check and adjust some 14 test points cold and hot per amp
Then again take it apart and do the rest of the caps some 60 or so
On Addition o verify each new cap with a capacitor analyzer as well as my own methods of charge and discharge
I also do the same with old caps too.
Some wound be surprised how much is lost over time.
ESR goes up rippple down
And leakage as well. Old caps don't die they just Become more tolerent of what they are supposed stop lol.
I also do the same with old caps too.
Some wound be surprised how much is lost over time.
ESR goes up rippple down
And leakage as well. Old caps don't die they just Become more tolerent of what they are supposed stop lol.
All electrolytics have a definite life. Even if they test ok for capacitance their other parameters may well be suspect. Often the ones originally installed are not the highest quality. You often find they are 85C caps. Once replaced with 105C high quality caps you can expect a much longer life. Heat is the enemy with Electrolytics.
Many moons ago I did repair and rebuild of a Krell spun pre and a ksa 200 mk1. Far easier to fix them then complete the recap. Probably 150 parts replaced in total, would hate to have done that in stages, it took a couple of hundred hours as it was inc stripping every nut and bolt.
Hello, I just messaged you on Audiogon. I have the Monster Krell KRS 200 Monoblock amplifiers that will need to replace the12 big Coke can Capacitors Do you have any available?
Thanks
Thanks
