I've never seen a Krell manual anywhere tbh.
I guess approaching Krell is one way. Might be worth asking in the 'parts' forum.
Parts - diyAudio
There are still things you can do although its difficult just working from pictures. There might be more rails and rectifiers than just those mentioned. Look and check. Also measure across the reservoir caps on all those rails. That's across all the largish caps in that area. If there was a short on a rail then that would show.
Although unlikely the transformer could still be at fault. You would need to mark and identify where all the secondary's go and then disconnect them all. If the tranny were faulty it would still pop the fuse.
I guess approaching Krell is one way. Might be worth asking in the 'parts' forum.
Parts - diyAudio
There are still things you can do although its difficult just working from pictures. There might be more rails and rectifiers than just those mentioned. Look and check. Also measure across the reservoir caps on all those rails. That's across all the largish caps in that area. If there was a short on a rail then that would show.
Although unlikely the transformer could still be at fault. You would need to mark and identify where all the secondary's go and then disconnect them all. If the tranny were faulty it would still pop the fuse.
16 Violet do you mean ? That is tied to the negative 30 volt rail (which will be for the display) via a zener to 'float' it. Fairly typical practice.
You did well to come up with a manual.
One approach to fixing this or at least standing a chance of finding a problem is to use a 'bulb tester'. That means fitting a 60 or 100 watt mains filament bulb in series with the mains to the player. The bulb will light brightly if there is a short or fault (and limit the current flow) but it does give you chance to measure voltages and see if anything is obviously amiss. If a rail has a short then it would have a very voltage, perhaps 0.5 volt or less while the other might still come up to a couple of volts with the bulb in place. Its gives you a fighting chance. You could isolate secondary feeds to see if removing any allowed the voltages to come up and the bulb to go out.
To prove the tranny is OK means isolating all the secondaries. If the bulb still lights under those conditions the tranny is duff (unlikely)
You did well to come up with a manual.
One approach to fixing this or at least standing a chance of finding a problem is to use a 'bulb tester'. That means fitting a 60 or 100 watt mains filament bulb in series with the mains to the player. The bulb will light brightly if there is a short or fault (and limit the current flow) but it does give you chance to measure voltages and see if anything is obviously amiss. If a rail has a short then it would have a very voltage, perhaps 0.5 volt or less while the other might still come up to a couple of volts with the bulb in place. Its gives you a fighting chance. You could isolate secondary feeds to see if removing any allowed the voltages to come up and the bulb to go out.
To prove the tranny is OK means isolating all the secondaries. If the bulb still lights under those conditions the tranny is duff (unlikely)
Only just spotted this bit. That's not good.
If all secondary's are disconnected then the tranny is duff unless there is a mains filter that's not shown and a cap or something is short. Does the mains go straight to the tranny ? or is there a filter in-between. Often there can a 0.1uf or similar cap across live and neutral which are classic failure items.
hi Mooly
there aren't any caps between the mains and tranny there are selector switches for input voltage selection. I've contacted Krell but they don't seem to know if they have the part or not.
Ive contacted a few companies who specialise in making/repairing transformers but they need to know spec etc. secondary AC voltages and current ratings!
there aren't any caps between the mains and tranny there are selector switches for input voltage selection. I've contacted Krell but they don't seem to know if they have the part or not.
Ive contacted a few companies who specialise in making/repairing transformers but they need to know spec etc. secondary AC voltages and current ratings!
For a so called prestige manufacturer that doesn't sound very impressive. Dunno what to suggest now. The tranny will be specially produced and things like that (Violet) tapping will be unique. You would need to know the percentage point into that winding it was connected. Current ratings of the windings... very difficult to guess at. You also wonder whether there will be any other problem with the player. Did the tranny just fail or was it pushed (overheated) due to a fault ? Secondary voltages probably could be estimated fairly accurately if needed but really you need to exhaust all hope of getting an original before going down that route.
Here is the last answer I received from them
Paul,
Not rude at all. However we are talking about a product that has not been built since 1999 or maybe 2000 at the very latest. You are requesting the availability of a part that we very, very rarely need to replace in a unit ourselves, and or that we very rarely get a request for from the field. I understand the service expectation from customers, dealer, and distributors alike. We try to offer the best support we can under all circumstances for as many Krell products as we can, regardless of vintage. I apologize if we are not able to respond to your request in a timely fashion that better suits your immediate need. As soon as we know for sure on this we will advise Absolute Sounds accordingly.
Patrick
Paul,
Not rude at all. However we are talking about a product that has not been built since 1999 or maybe 2000 at the very latest. You are requesting the availability of a part that we very, very rarely need to replace in a unit ourselves, and or that we very rarely get a request for from the field. I understand the service expectation from customers, dealer, and distributors alike. We try to offer the best support we can under all circumstances for as many Krell products as we can, regardless of vintage. I apologize if we are not able to respond to your request in a timely fashion that better suits your immediate need. As soon as we know for sure on this we will advise Absolute Sounds accordingly.
Patrick
The 'repairs' actually look like production modifications tbh. Its not uncommon at all to see things like that.
As to the other, hmm... so its 15 yrs old. The company will argue that the product is past its life span and they are not obliged to carry spares for something that old, the flip side is that as a manufacturer where 'image is everything' then its not unreasonable for customers to expect older products to be serviceable. Its not like its £199 Technics or Sony. I do agree its probably an extremely rare failure item, lol, so rare that spares they should/would have carried should still be available.
Have you gone as far as removing the tranny from the unit ? Any smell of burn to it or anything else obviously amiss.
As to the other, hmm... so its 15 yrs old. The company will argue that the product is past its life span and they are not obliged to carry spares for something that old, the flip side is that as a manufacturer where 'image is everything' then its not unreasonable for customers to expect older products to be serviceable. Its not like its £199 Technics or Sony. I do agree its probably an extremely rare failure item, lol, so rare that spares they should/would have carried should still be available.
Have you gone as far as removing the tranny from the unit ? Any smell of burn to it or anything else obviously amiss.
And with a bulb tester in series with the primary it definitely lights at full brightness (all secondary's isolated). If its doing that then it really is faulty.
If it came down to scrapping the unit or trying something then if the space permitted you could look at rigging something up using a couple of transformers but will never get the 'all separate' layout it has now with all its multiple windings. It would need a lot of thought though and you would have to accept it may not be totally satisfactory in some way... that you would only find by trying.
If it came down to scrapping the unit or trying something then if the space permitted you could look at rigging something up using a couple of transformers but will never get the 'all separate' layout it has now with all its multiple windings. It would need a lot of thought though and you would have to accept it may not be totally satisfactory in some way... that you would only find by trying.
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