I appreciate all the suggestions on how to make modifications to the unit, but I prefer to keep it as designed, even if there are a few minor flaws. I can tell you that Casper at Stereo Rehab has fixed these (and other Krell models) before and knows them inside and out. He was very helpful and I can't say enough about their service and knowledge. Here's what he listed as the repair:
"Krell KSA-250: service. Thermally damaged standby and relay supply dropping resistor replaced (metal film flame proof, 2w);standby primary filtering
replaced (105', 450v); thermally damaged front end supply filtering replaced (both) including armature supply rail and stand by pre-regulation supply rail (all fresh
Nichicon, 105'). Operating as designed."
Issue with Krell KSA-250
Hello-
It's been a minute since I've been on the forums here, but I'm glad they are still around!
I am the second owner of a Krell KSA-250 amplifier. For the past 10 years it hasn't given me any problems. Then today, when I turned it on, it emitted a rather loud buzzing sound. This wasn't coming from the speakers (like a ground loop hum), this was a very startling almost "mechanical" buzz sound. The buzz does not stop until I turn the unit off.
I'm not sure where to start. I called my local audio repair store, but they don't work on Krell. They suggested I contact Krell, which is my next step, but seeing as I'd have to freight this for it to be repaired, I'm hoping someone here might shed some light on what's happening. I've made a short 15-second video of the issue, but I don't think I can upload it here. I'm happy to provide it though.
Any thoughts you might have would be appreciated.
Thanks,
Blake
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@blakeh - Did anyone suggest you try the amp 0on another circuit? While it is true that your buzzing is probably coming from the transformer, these issues sometimes only happen when there is DC on the line or a bad neutral. Move it to another circuit or location in your home and see if the problem disappears. If so, it's a circuit problem. This can be poor wiring or an appliance that is drawing only from one direction of the AC waveform. Wall warts, LED light strips, compact florescent bulbs and PC power supplies are notorious for this. |
Watched & listened to your video and I think it's the transformer making the buzz. For servicing, this info came up in a post from several years ago. Worth a shot. I own 4 of these and have used them for live sound engineering purposes. |
- 50 posts total