U/L or triode mode on music angel amp - diyAudio
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Old 17th March 2007, 11:47 PM   #1
arvin is offline arvin  United Kingdom
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Default U/L or triode mode on music angel amp

I have upgraded and just bought a lovely sounding music angel kt88(sovtek) amp, it absolutely destroys my yarland 34 ciii, the stereo is 3d and the bass is much better.The sound quality is truly extraordinary.

Does anyone know what position the switch on the back has to be for each mode? i.e is the up position U/L or triode?

Which sounds better U/L or triode and why?

are there any better tubes that can be bought for this amp?

The other tubes are 12au7 and 12at7.
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Old 22nd March 2007, 11:38 AM   #2
aau70 is offline aau70  New Zealand
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up for UL for mine, it is a nice amp... I am using shuguang kt88 (I love the sound) and I changed 12au7 and 12at7 to mullard.
mine was making a popping sound when i turn it off on UL mode, but after I disabled the UL mode, the sound is getting better (I have no idea why)
How about yours, is it making a pooping sound?
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Old 23rd March 2007, 09:25 AM   #3
arvin is offline arvin  United Kingdom
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yes it does actually, the kt88s are by sovtek so you advise changing the input tubes to mullard?

How did you disable the u/l mode?

cheers
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Old 23rd March 2007, 09:28 AM   #4
arvin is offline arvin  United Kingdom
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In order to determine which mode its in, if you are not sure of the switch position, in u/l mode the volume would be slightly higher for any given volume position?
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Old 24th March 2007, 01:10 AM   #5
aau70 is offline aau70  New Zealand
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Correct, when in UL mode it's 60 watt and in Triode it's 30 watt.
re. changing your driver tubes, it's depend on your taste, Mullard is more mellow to me. (I am listening to jazz and vocal most of the times)
Here is the thread on how to disable UL mode:
Help! Upgrade a Music Angel KT88
Cheers
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Old 24th March 2007, 07:57 AM   #6
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Default Re: U/L or triode mode on music angel amp

Quote:
Originally posted by arvin
Which sounds better U/L or triode and why?
Flip the switch back & forth and you tell us Trust your ears.

Actually it will be dependant on your speakers to at least some extent -- and sometimes even the music you are playing. As a generalization -- very general -- triode mode will usually have the edge sonically at the expense of power.

dave
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Old 25th March 2007, 01:32 AM   #7
arvin is offline arvin  United Kingdom
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can anyone advise on improving the driver tubes (12au7 and 12at7)?

cheers
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Old 25th March 2007, 07:05 PM   #8
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Hi

I have redraw (with some change) the schematics of music angel.
(based on schematics posted by gingertube)

Now the values of the a.c. tensions miss me...

do I have to make some change?
Attached Files
File Type: zip angel.zip (68.3 KB, 64 views)
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Old 25th March 2007, 07:13 PM   #9
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Quote:
Originally posted by arvin
can anyone advise on improving the driver tubes (12au7 and 12at7)?

cheers
For the 12au7 12at7 I think that JJ is a good choice..
http://www.jj-electronic.sk/
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Old 25th March 2007, 07:32 PM   #10
rdf is offline rdf  Canada
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Quote:
Originally posted by Gold_xyz
I have redraw (with some change) the schematics of music angel.
Hi Gold. The 12AT7 cathodes don't appear to have a path to ground. Is that right?
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