Anyone know the Krell kps20i ? - diyAudio
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Old 10th May 2007, 12:17 AM   #1
3Dgeek is offline 3Dgeek  United Kingdom
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Default Anyone know the Krell kps20i ?

Hey,

I've just bought a second hand krell kps20i and i'm looking for some info on this machine as it has a few possible problems.

First, the player makes quite a bit of noise when the disc is spinning, eg not what i'd call quiet anyway.

second is that i seems to produce quite a bit of heat on the left side when running, i guess this is the psu area...

Other thing is the lcd display is not working correctly (time display i think) some of the characters are broken, i guess this is a fault..

Are any of these things (apart from the LCD) "normal" for the kps20i ?

Thanks

Reuben
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Old 19th January 2010, 01:00 PM   #2
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Yes, mine Krell KPS20i behaves similar with spinning noise and heatdevelopment
The red numerical display has been changed by a green version by Krell says the former owner because of the same problems.
Do you know by any chance what the four AD OP42G right after the DAC section do and the OP27G's further downstream. Thought that the I/V transfer and lowpass filtering where complete discrete in this player.
Do you have the Delta 9 upgrade with the AD 56009F 80 MHz and updated firmeware?
I haven't though.

Greetings!
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Old 19th January 2010, 04:51 PM   #3
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for this Krell model I need a schematic diagram (unfortunately there are no download aera to download the manuals for the older models).
Also for the Krell model "KPS-25sc" (transport "EXU-901a" from JVC inside).
have a look also there:
JVC "EXU-901a" (KRELL KPS-25sc Phase Tech CT-1 CT1) better than VAM1254, CDpro2LF ?
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Old 19th January 2010, 08:40 PM   #4
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Since the heatsinks for the voltage regulators are bolted directly to the left housing piece, it is very normal for that to be quite warm. The noise may be indicative of the platter motor bearing going bad or simply failing to self-lubricate, which, in my experience, can often be cured by adding a few drops of 'Prolong Super Lubricants Precision Oil', preferrably after taking apart the motor & cleaning the shaft & sleeve bearing(can't recall is this is possible with that version of the CDM-9), if the noise is actually coming from the motor. On rare occassions, noise that follows rotational speed of the disc can be actually coming from the laser's focus actuator, and can be a symptom of the CDM-9 laser getting weak(servo working harder to compensate, creating more actuator hiss).
Krell is even worse than Proceed about releasing schematics(even during the 4 years I worked within a Krell dealership, I never saw a single schematic for anything newer than a KSA-250, even when they had me doing 'special authorisation' warranty repairs), but I have a fair amount of confidence that the opamps in the RIDICULOUSLY long & complicated discrete output stages of this & so many other Krell cd players are simply DC servo's, and don't make a difference to the sound if changed/upgraded. If I actually owned one of these players myself, I'd gut the whole output stage and install the simplest possible output stages, either discrete or OPA134 opamp based. It would have to lift the 'haze' that seems endemic to Krell's cd/dac output stages, not to mention shorten the 24-48 hours it takes them to fully warm up to sound best by quite a lot.
Anyone getting the feeling I'm not a big Krell fan?;-)
Some years ago I made the terrible mistake of taking my, at that time, modestly upgraded(by me) Museatex BiDAT dac & CD-D C-Lock transport to my best friend's house, in order to a/b with his Krell KPS-20i & horribly expensive Krell dac he was running it into. The BiDAT beat his Krell setup so badly that he would not let me leave until he'd gotten to a price I'd accept for the BiDAT, which I've regretted ever since(especially after upgrading further that same dac for him a few years later). He used the KPS-20i as a transport with it for a while, until he discovered how much better the Museatex CD-D(with minor upgrading) sounded as a transport, with it's CDM-2 mech & brilliant Meitner C-Lock reclocking circuit(which is also in the BiDAT, in even better form). Still haven't heard better sound from any digital source than that combo.
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Old 19th January 2010, 11:58 PM   #5
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Quote:
Originally Posted by stephensank View Post
Krell is even worse than Proceed about releasing schematics.
That's correct. Besides the KPS20i I have an old Krell KRS-2 preamp and no way you get schematics or service manuals. I once mailed for some info about the accompiniying KRS-100 & 200, simple facts like weight, size idling power, but they seemed to have forgotten these amps almost completely.
Levinson is exactly the same. Jeff Rowland is much better in that era and Nelson Pass shares his intellectual property for free!
So if your in the market for secondhand highend audiogear, and aren't we all, then remember if you ever get troubles with it, which brands to buy.
I pray that the Philips CDM9 Pro inside my player will last. I perform as few operations like FF REW, skipping, as possible. Don't know if that prolonges the life of it. Maybe some NatLab Philips engineer knows how to pamper/cherish those transports to get the maximum life out of it.
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Old 20th January 2010, 05:01 PM   #6
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You don't have to worry too much about the laser going bad, since you can scavenge that from ay cdm9 type, but if the platter motor goes irreparably bad, you could be seriously screwed. So, the only thing you can do to extend the life of that motor is to use it as little as possible. Mostly that means simply never letting the thing sit in pause mode for long periods, going to stop mode whenever you'd just pause it. Beyond that, it's pure luck. The VAM1250(1254?) has a suspiciously similar looking brushless platter motor(only nice part I've ever seen on a 12 series), but I doubt it's actually a compatible or adaptable replacement, but haven't had a chance ever to directly compare. Could be the same motor, or completely different.
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Old 11th October 2011, 07:33 AM   #7
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for description recapping project go to post #352 about
Best electrolytic capacitors
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Old 11th October 2011, 12:05 PM   #8
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Keep in mind that Krell really isn't Krell anymore now that the main man, Dan D'Agostino is gone. Now that the company is run by someone else. the whole way of doing business has changed and often times in such situations. dealing with older products becomes a major pain. where as older products may have been serviced as sort of an customer loyalty thing. the new owners may not feel the same need to deal with aging products. In short they don't feel the same need to oblige customer loyalty. Which is a similar thing to whats happening at the company i work for!
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Old 10th November 2011, 08:00 AM   #9
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Quote:
Originally Posted by Zero Cool View Post
Keep in mind that Krell really isn't Krell anymore now that the main man, Dan D'Agostino is gone. Now that the company is run by someone else. the whole way of doing business has changed and often times in such situations. dealing with older products becomes a major pain. where as older products may have been serviced as sort of an customer loyalty thing. the new owners may not feel the same need to deal with aging products. In short they don't feel the same need to oblige customer loyalty. Which is a similar thing to whats happening at the company i work for!
Obviously now it is more easy to get service informations - read the posts #1+2 about
KRELL FBP 200
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Old 10th November 2011, 08:28 AM   #10
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Quote:
Originally Posted by tiefbassuebertr View Post
Obviously now it is more easy to get service informations - read the posts #1+2 about
KRELL FBP 200
Try to get something about the real old stuff like KSA/KMA/KRS/PAM Series.
There's a lot of that old stuff out there that will need servicing.
Same with the Levinson ML Series apart from the ML-2 that's well documented on the Web.
Rowland and Nelson Pass are really great in that era so that should influence your choice when your in the market for some new audio stuff.
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