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Old 20th November 2006, 08:32 PM   #1131
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As you go to the higher voltage parts the transconductance
decreases (higher voltage doping gives greater resistivity)
and you subjectively see more bottom, but somewhat at
the expense of the top end. This is reasonably subtle, but
is exacerbated by using IR input P channel devices. For this
reason, the Harris or Fairchild input P channel parts are even
more important.
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Old 21st November 2006, 04:28 AM   #1132
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Quote:
The 044's sound ever so slightly darker, but still ever so resolved.
That's interesting, Terry. I couldn't quite put my finger on it, but my ZV7-T sounds quite different with the 044's vs. the 244's. A bit more subdued, but very sweet. The top-end isn't glaring anymore.

Here's to darker,

John
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Old 23rd November 2006, 12:18 PM   #1133
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Exclamation ???

Are we saying two different things here???

It sounds like a lot of folks are claiming the 044 are "a bit darker", however, based on what Nelson just said the higher voltage parts (144's & 244's) should be the ones that sound darker.

I am somewhat confused... Which is it?

Thanks,
Jeff
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Old 23rd November 2006, 03:07 PM   #1134
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yup, just reporting what my ears hear...

John
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Old 23rd November 2006, 06:41 PM   #1135
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Sounds like we need some blind testing here
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Old 26th November 2006, 07:38 PM   #1136
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I am wondering if anyone can help me. I have a problem with my aleph-x. Here is the schematic. I am using 4 devices total per side. 22.5vdc and about 2.5 amps per side. It seems to bias up where it should, and I have about 4.5v on r1 and r51. I can get dc down to a ok level and every thing seems to be ok. The problem is when I give it a signal, I can just barley hear sound out of a speaker. I thought the output protection might be on but the bipolars are off. Any ideas where to look next?
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Old 26th November 2006, 08:10 PM   #1137
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Hmm..hard to tell. You have a scope?

/Hugo
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Old 26th November 2006, 08:37 PM   #1138
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I had the same problem and the BC550 were reversed.

Thierry
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Old 26th November 2006, 09:58 PM   #1139
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I do have a scope. And I will check the bc550c. I don't think they are in backwards.
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Old 26th November 2006, 10:06 PM   #1140
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check all resistor values and positions
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