|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
173.33.10.228
In Reply to: RE: Looking for troubleshooting help posted by murali on May 21, 2015 at 20:25:10
Your first step (swapping one end of the interconnects) would lead you to think the problem was the preamp.
However your second step (swapping tubes in the amp) has nothing to do with the preamp. Why would you conclude the preamp was at fault.
What you may have is a bad tube in the power amp.
Since you have HT bypass, try it in that mode. Does the channel still have lower output when using the HT. HT almost completely eliminates the circuitry in the Line 3.
Dan Santoni
Follow Ups:
> Your first step (swapping one end of the interconnects) would lead you to think the problem was the preamp.
Well, the problem is upstream from the power amplifier.
> However your second step (swapping tubes in the amp) has nothing to do with the preamp. Why would you conclude the preamp was at fault?
He uncrossed the interconnects before swapping tubes in the amp. This is what he wrote:
> Next I swapped the two input stage tubes inside the power amp with normal L/L and R/R connections.
Consequently, the problem is still upstream from the power amplifier. The problem is not in the power amplifier.
Agreed, I misread that section.
Dan Santoni
The power amp is a hybrid with just one input stage tube per channel which I swapped as suggested by the manufacturer. There was no change (unlike when I swapped the interconnects when the lower sound moved from Left to Right) and the Left channel output continued to be low. That is when they suggested I return the amp. This imbalance is very much evident when I play stereo where the imaging has shifted significantly to the right though the left channel sound is there at lower levels. With the pass-through, using speaker test tones from the surround processor, it is very much evident. Considering the practical difficulties in shipping the power amp (assuming the problem is with that), I am looking for some guidelines to see whether it can be fixed here.
Why do you think the problem is in the power amplifier? Your first test proves the problem is up stream from the power amplifier. Your second test shows the problem has nothing to do with the input tubes on the power amplifier because the problem remained in the same channel. I think you confused everyone with your second test because they all thought you kept the interconnects in the crossed configuration from your first test. However, you reconnected your interconnects properly at the same time you switched input tubes. Therefore, the problem is not in your power amplifier. You can return the amp if you want, but you're wasting your time and money and the problem will still be there when you get it back.
Does your preamp have a balance control? Perhaps it's not centered.
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: