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In Reply to: RE: Please help me troubleshoot my new SET posted by rebbi on January 27, 2015 at 12:41:56
"He is suggesting that the DAC is putting out too high a voltage ..."
Can't you just turn the volume control down?
If the power amp is clipping because it's getting too much audio signal, the only answer is to attenuate the source signal. Unless you wanted to re-design the power amp circuit for less gain but then there might not be enough for the phono pre output.
Do you have anyway to test the amp for output power?
If the amp is making the rated output power before clipping then it's probably not the problem and you're just playing it too hard.
My 2 cents.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Follow Ups:
No, it may not help. AN kit 1 volume is after the first amplification stage 6SN7. If this one is clipping due to very high input signal, volume won’t help. But I doubt it is the case.
I thing it just because with 91dB (real sensitivity of DeCapo) kitOne is just clipping with loud bass. I doubt that this amplifier can have more then 3-4w output at 20-30 Hz. Also 91bB is at 1KHz, at lower frequencies sensitivity in nowhere near that.
What you can try to do is to disconnect volume control from the capacitor from 6SN7 anode and send DAC signal direct to the volume control.
But again, it probably won’t help. Also, you can't compare analogue playback with the DAC, there are no that low frequency components with that amplitude on the LP
Edits: 01/28/15 01/28/15 01/28/15
"AN kit 1 volume is after the first amplification stage 6SN7"Yes, I saw that after posting.
Please see my newer post above in this thread.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 01/28/15
Speaker sensitivity can also be an issue, picking up all the bad stuff and transmitting it at high volumes with great detail.
Observe, before you think. Think before you open your yap. Act on the basis of experience.
We're pretty sure speaker sensitivity isn't the culprit here because the Kit 1 is driving the De Capo's just fine with the phono side of things -- Bottlehead Seduction, specifically.
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