Most volume controls are most linear from 9 to 3 o'clock. So if the sound is fine (not distorted) you are probably ok!
Stumped by preamp-amp issues
Hi all,
As the title says, I'm at a loss as to what is going on, so I'm turning to the community in the hopes you can help.
I have a Bryston 12B preamp that I bought new 25+ years ago. For the last year I've been running it balanced into an Audio Research D240 mkII amp, which is powering Martin Logan CLS IIz speakers. (Yes, I know this gear is old, but I love the sound.)
A few months ago, the 12B and D240 started distorting and power cycling. I started with the preamp because something similar had happened while it was still under warranty. I sent it to Bryston. Bryston replaced the power cord as a courtesy, but could find nothing wrong with the unit. It tested fine. I got it back and connected it to the amp, and the distortion and power cycling were still there.
I took the amp to Audio Research. They looked at it, bench tested, connected to their test systems, and could find nothing wrong. They did nothing else to it. The only suggestion I got from them was that the amp "sensitive to DC offset at the inputs and that can cause the unit to go into protect".
I got it back and connected it up to the preamp and speakers, and the distortion and cycling were gone.
However, now the system gain is much lower than it was. I now have to turn the volume on the preamp much higher than before (past 12 o'clock). I have a second amp that I can only run unbalanced and that gain is unchanged.
So what gives? Does anyone have any ideas or suggestions for what I might try? The system does not distort when I turn up the gain (no clipping), so I can do that, but would prefer not to.
Thank you in advance!
As the title says, I'm at a loss as to what is going on, so I'm turning to the community in the hopes you can help.
I have a Bryston 12B preamp that I bought new 25+ years ago. For the last year I've been running it balanced into an Audio Research D240 mkII amp, which is powering Martin Logan CLS IIz speakers. (Yes, I know this gear is old, but I love the sound.)
A few months ago, the 12B and D240 started distorting and power cycling. I started with the preamp because something similar had happened while it was still under warranty. I sent it to Bryston. Bryston replaced the power cord as a courtesy, but could find nothing wrong with the unit. It tested fine. I got it back and connected it to the amp, and the distortion and power cycling were still there.
I took the amp to Audio Research. They looked at it, bench tested, connected to their test systems, and could find nothing wrong. They did nothing else to it. The only suggestion I got from them was that the amp "sensitive to DC offset at the inputs and that can cause the unit to go into protect".
I got it back and connected it up to the preamp and speakers, and the distortion and cycling were gone.
However, now the system gain is much lower than it was. I now have to turn the volume on the preamp much higher than before (past 12 o'clock). I have a second amp that I can only run unbalanced and that gain is unchanged.
So what gives? Does anyone have any ideas or suggestions for what I might try? The system does not distort when I turn up the gain (no clipping), so I can do that, but would prefer not to.
Thank you in advance!
- ...
- 16 posts total
I took a look at the manual for the amp, which I found at hifiengine.com. I see that when its "normal" or "inverted" RCA inputs are used RCA shorting plugs should be inserted into the other of those inputs, but RCA shorting plugs should NOT be inserted when the XLR inputs are used. I’m wondering if when ARC worked on the amp they might have put shorting plugs on one of those RCA inputs, and if so if the shorting plugs may still be there. If that is the case they are most likely the cause of the loss of gain you are seeing when using the XLR inputs, as they would be shorting one of the two signals in the balanced pair of signals to ground. Also, if perchance shorting plugs were in place in the past, when the distortion and power cycling were occurring, the short being placed on one of the two signals in the balanced pair of signals being provided by the preamp could conceivably have been stressing the output circuit of the preamp in a manner that eventually caused it to distort and/or power cycle. And that might even have caused the preamp to output some amount of DC, causing the amp to power cycle. Regards, -- Al |
can you begin with a more precise definition of what you mean by power cycling? - and try to speak of what each components does independently:
If it is not a net result, you should be able to identify which component is doing what. If it is both, say so. If one does it and a fraction of a moment later the other does, say so. Its way to vague and i will say comments so far are merely speculation. G |
@djohnson54 Thanks. There are no shorts on the speaker connections. @roberjerman Back in the day, audiophiles were admonished not to turn the volume above 12 o'clock because equipment was at full gain at that point and going past 12 o'clock just pushed amps into clipping. It's good to know that may no longer be the case. @almarg I've never used the shorting plugs; in fact, none came with the amp when I bought it used. But, I hadn't considered that perhaps ARC used them. There are no plugs on it now. I'll have to get some since I plan to run the amp unbalanced in the future. @itsjustme The power cycling entailed the green LED on the preamp rapidly alternating from green to red. The LED on the amp was simultaneously doing the same thing. Every time the power LEDs switched to red, the sound was distorted through the speakers, sort of harsh and "buzzy". It was as if the system were being driven into clipping, but at a low volume. It was similar to the sound of a poorly tuned FM station. This happened whether I was using the balanced or unbalanced connections between the preamp and amp. It did not happen when I had the preamp connected to a different amp (Bryston 2B, unbalanced). Thank you all for your time and input! |
@cflayton, This brings to mind an issue that was discussed in the following thread, in which someone was seeking an explanation as to why changing the input impedance of his amp from 100K to 47K cured a problem in which the amp’s bias would fluctuate wildly: https://forum.audiogon.com/discussions/why-did-this-fix-my-problem Some excerpts follow from the posts in that thread by Ralph Karsten of Atma-Sphere. Note the reference to an ARC amp. Also note that the input impedance of your amp is 300K balanced and 150K unbalanced, which is much higher than the input impedance of both the D-150 Ralph mentions and the amp used by the OP in that thread. Everything else being equal the very high input impedance of your amp increases the likelihood that the phenomenon Ralph describes is what was going on when the distortion and power cycling occurred. (In saying that I’m assuming the preamp has coupling capacitors at its outputs; I couldn’t find a schematic for the 12B but schematics I looked at for several other somewhat more recent Bryston preamps do indeed show output coupling capacitors, which in fact have relatively large values such as 47 uF which also increases that likelihood substantially). Atmasphere 8-3-2012 If the distortion/power cycling problem should re-appear it would seem to be a good idea to call this possibility (which I think is a very strong possibility) to Bryston’s attention. Regarding the gain reduction that occurred, I have no thoughts at this point. Regarding shorting plugs, a search at eBay for "RCA shorting plugs" will turn up a number of inexpensive sources. Good luck. Regards, -- Al |
- 16 posts total