Normal life of power tubes is between 1000-2000 hours. But Chinese tubes often die even earlier. I suggest to replace all four tubes with a new set. Yku do not need matched quad here - just two matched pairs.
I think they have about 1000-1500h on them.
Yes, i will look into some new quad or matched pairs.
Candidates are:
1. Gold Lion reissue - many like them
2. Tung-sol 6550 reissue (ofcourse kt120 could work but i feel it's gonna go motorboating sooner or later..)
3. JJ KT88
Most important for me is the midrange, effortless and really open.
If someone listened to above tubes please share.
Yes, i will look into some new quad or matched pairs.
Candidates are:
1. Gold Lion reissue - many like them
2. Tung-sol 6550 reissue (ofcourse kt120 could work but i feel it's gonna go motorboating sooner or later..)
3. JJ KT88
Most important for me is the midrange, effortless and really open.
If someone listened to above tubes please share.
I didn't wanna listen any more and turned the amp off for good till i get new tubes. In this case, with one tube failing, is it possible that other components got a "kiss goodnight"? Thinking maybe some resistor is left open?
-I'll better measure all before mounting new tubes.
EH-KT88 sounds good in this amp and are less expensive than GLs, it will be hard to hear the difference here IMO.
Cheers,
Bob
If i now remember correct yaqin said himself in a mail about a year ago that pt was 150 per channel. But i'm not sure. Could've been 200 too.
Anyway i remember that kt120 is not for this amp.
My amp with all tubes to 0,55v draw total 180w from my 230 outlet. If that helps? On the back it says powerconsumption is 300w.
Fuse are 3A so should be half with 115V.
Anyway i remember that kt120 is not for this amp.
My amp with all tubes to 0,55v draw total 180w from my 230 outlet. If that helps? On the back it says powerconsumption is 300w.
Fuse are 3A so should be half with 115V.
No No - Current = Watts/Volts therefore if you halve the voltage you have to double the current for the same wattage. So a 3A at 230V has to be changed to a 6A at 115V.
We talked about feedback in this mc100 earlier. Isn't it "bad" thing? What issues does it adress in this amp? I hear many people doesn't want feedback because destroys SQ? I know there is something about making the amp more "linear".
In my case i would now have a more "linear" amp connecting SP to 8R then 4R. So i'll guess i've been listening to a unlinear amp for awhile then? Maybe i have understood this completly wrong.
In my case i would now have a more "linear" amp connecting SP to 8R then 4R. So i'll guess i've been listening to a unlinear amp for awhile then? Maybe i have understood this completly wrong.
There are only two meanings which can be reliably attached to "too much feedback":
1. the amp is on the verge of instability, so is ringing at LF or HF frequency extremes - this would certainly not sound 'dull'
2. the amp has low distortion so lacks the 'warmth' of extra 2nd harmonics or the 'tizz' of extra 3rd harmonics, thus sounding 'dull' to those who have become used to this sound and prefer it
Perceptions of dynamic range alteration may arise from 3rd order distortion. This can do two things: genuinely extend or compress dynamic range by producing extra signal at the fundamental frequency either in phase or antiphase to the original, and simply make it sound louder because of the extra distortion. Feedback will reduce both these effects, so the dynamic range out will be more like the dynamic range in.
1. the amp is on the verge of instability, so is ringing at LF or HF frequency extremes - this would certainly not sound 'dull'
2. the amp has low distortion so lacks the 'warmth' of extra 2nd harmonics or the 'tizz' of extra 3rd harmonics, thus sounding 'dull' to those who have become used to this sound and prefer it
Perceptions of dynamic range alteration may arise from 3rd order distortion. This can do two things: genuinely extend or compress dynamic range by producing extra signal at the fundamental frequency either in phase or antiphase to the original, and simply make it sound louder because of the extra distortion. Feedback will reduce both these effects, so the dynamic range out will be more like the dynamic range in.
Hi,
Without GNFB the amp would sound/be distorted. IOW not linear at all.
It is not because the FB loop is taken from the 8 Ohm tab of the OPT and the LS are hooked up to the 4 Ohm tab that redesigning the FB network for the 4 Ohm tab would make much of a difference.
Think about this: some triodes are more linear than others because they have more feedback built in.
Even order distortion may well sound more pleasant to the ear than odd order distortion. At the end of the day it still is distortion.
So, no, connecting the nominal 4 Ohm LS to the 8 Ohm tab of the OPT would not make it more linear, probably quite the contrary.
Ciao,
Without GNFB the amp would sound/be distorted. IOW not linear at all.
It is not because the FB loop is taken from the 8 Ohm tab of the OPT and the LS are hooked up to the 4 Ohm tab that redesigning the FB network for the 4 Ohm tab would make much of a difference.
Think about this: some triodes are more linear than others because they have more feedback built in.
Even order distortion may well sound more pleasant to the ear than odd order distortion. At the end of the day it still is distortion.
So, no, connecting the nominal 4 Ohm LS to the 8 Ohm tab of the OPT would not make it more linear, probably quite the contrary.
Ciao,
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