Discussion in 'Audio Hardware' started by Daedalus, Jan 14, 2017.
Any such reports about A-S1100 and A-S2100 models?
I have not heard of anyone experiencing this with the AS1100/2100. I have owned the 1100 for about a year and a half and have zero problems!
Unfortunately I have read about several people having this problem with the as3000.
I have the A3000 for over a year now and never had such problems, it's at least powered on for 12-16 hours a day...
Same here with an AS2100. Zero problems, with heavy use.
A replacement unit has failed in exactly the same way.
I heaved it out of the box and stood it on a table, connected it to the electricity supply and switched on. After an hour's operation it was pretty warm, though probably consistent with the specified 350w power consumption, but still powered on. The placard on the rear of the units shows the correct power (230v 50Hz) for where I am (UK).
I powered it off and placed it in my hi-fi rack. Ventilation is, I think, adequate: the rack is only a couple of inches wider and deeper than the amplifier and open on all four sides, and is freestanding in the room; the top of the amplifier is 54mm from the (glass) shelf above. The room temperature was about 21C.
I connected the loudspeakers (KEF Reference 3, a year old), to the Speaker A terminals using basic copper wire and with no short circuits. I connected my Pioneer plasma TV to one of the RCA inputs (CD in fact) and my Audiolab CD player to BAL 1 with -6dB attenuation selected. After switching on, performance was normal and everything sounded fine, from both sources.
After two hours of listening at ordinary domestic levels I muted the TV but left the amplifier on.
When I returned half an hour later, the amplifier was inoperative, with the power light flashing, just like on the earlier unit. Nothing would bring it back to life.
I struggle to find an explanation that involves incorrect operation, and if there's anything wrong with the electricity supply it isn't bothering my trusty Audiolab 8000S amplifier or any of the dozens of other devices currently using it.
I will be delighted if anyone can show me what I am doing wrong.
Have you disabled the auto power standby function just to make sure that's not in play? There is a switch on the back.
Some posters elsewhere suggest that may help:
Yamaha AS-2100 auto power standby question
I'm not saying this is the reason for the problem, but for future reference 2 inches (54mm) is not enough space for proper cooling. Generally, 6 inches is considered a minimum.
Convection cooling relies on pulling cooler air up from the bottom, so space above helps that air flow. This is even more important when the heatsinks are internal.
Thanks for the suggestion. In fact I checked the switch when I unboxed, and it was set to ON so I left it that way. Operating it now isn't changing the problem.
One extra thing I have just done is run the diagnostic procedure shown on p26 of the service manual. This involves setting the balance knob fully CCW and operating on/standby with the audio mute switch held down. The pattern of flashes I see is groups of three (1 1 1 0 1 1 1 0 1 1 1 0 etc), which is not among the options shown in the table.
Can't really contribute to the discussion but man I love those meters. Build quality looks top notch on these too. Interesting to read in this thread that the chief engineer wanted them to sound like high end tubes. cool!
Thanks for the advice. I was hoping the otherwise excellent (360 deg) ventilation would compensate, and it didn't seem to be getting any hotter than it had sitting on a table.
If it were overheating, leaving it off for half an hour and restarting ought to work, and it hasn't.
However, I do have a Plan B, which is to sacrifice my ancient and seldom used Thorens + SME vinyl player and plonk the amplifier on top of the rack in its place.
Like I said, I don't think the ventilation situation is the reason for your problem, but it never hurts to make sure there is plenty of it.
A beautiful amp. But, it doesn't have variable Loudness...!!!
Nice amp though. A big Yamaha fan. Nothing this serious. Just A/V gear. A DSP-A3090 and a RX-A3030. I love both.
Very beautiful classic style!
Even for improper ventilation, it will take a while before it will take a toll on the amp ...
Not if it's pure Class A.
IIRC, A-S3000 is not a Class A amp ...
I was commenting on your comment....nothing to do with the Yamaha.
No probs with my 3000 so far-daily user.
Yes I can attest to the very high quality build. And the sound? Extremely transparent. Natural Sound? Yes As I understand the meaning of that phrase. Very quiet amp as well. No apparent distortion at high volume.
Problem it is pricey. You can now get the MF 6500i cheaper than this (500w per channel and dual mono). I'm not sold on superfluous meters. It is certainly a looker which was always a Yamaha strong point, but SQ doesn't always match up to looks.
Pricey? Yes it is so. I could not have purchased this at retail price. Sound quality? Excellent. Meters? Fun and gives it a classic vintage vibe.
So MF6500i is a new Yamaha model?
My A-S2000 did this after owning it for some time. Yamaha sent me a new one. I didn't realize others had the same problem until reading this thread.
Loved that amp, though!
I think that is a "Musical Fidelity" model.
It is for sure.
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