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Old 27th November 2006, 01:14 AM   #1141
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The bc550c are in correctly. It also seems like I have all the correct resistor values, unless I have two of the same resistors marked wrong. Can I take out r7, r8 and q3? It should work with out them? Or am I wrong?
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Old 27th November 2006, 05:04 PM   #1142
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R7, R8 and Q3 can be removed.
Apply a signal and check with the scope on both sides of both feedback resistors. (52 and R52).

/Hugo
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Old 27th November 2006, 11:38 PM   #1143
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Thanks Netlist. I will check with scope and report back.
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Old 28th November 2006, 12:45 AM   #1144
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Is it possible to speed up initial warmup time? I don't want to have to wait more than a couple minutes for the amp to reach a stable operating point. What about running extra high bias for the first minute or two to heat up the output devices and heatsink?
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Old 28th November 2006, 01:35 AM   #1145
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Quote:
Originally posted by Nixie
Is it possible to speed up initial warmup time? I don't want to have to wait more than a couple minutes for the amp to reach a stable operating point. What about running extra high bias for the first minute or two to heat up the output devices and heatsink?
Sure.. go buy a heat gun and heat the heat sinks your self. Kinda pointless.. why are you so much in a rush ?
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Old 28th November 2006, 01:59 AM   #1146
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Quote:
Originally posted by Nixie


Is it possible to speed up initial warmup time? I don't want to have to wait more than a couple minutes for the amp to reach a stable operating point. What about running extra high bias for the first minute or two to heat up the output devices and heatsink?

For example, my Zen V5 needs half an hour to one hour depending on room temp, in reaching to the warm operation (within +/- 50mV offset) from the cold (abt 300mV offset).

During this period, I'm not able to distiguish musical sound difference at home listening.
Just nice sound all the way . . .
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Old 28th November 2006, 03:14 AM   #1147
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Quote:
Originally posted by Netlist
R7, R8 and Q3 can be removed.
Apply a signal and check with the scope on both sides of both feedback resistors. (52 and R52).

/Hugo
Thanks for the help Hugo. I now have a working amp. One of my feedback resistors was bad, it some how failed open. I don't know if I did it when I folded the leads or what. I pulled it out and replaced it and now it is settling down. I will let it warm up and see where Vdc is at. Now off to the second channel. Thanks for the help!
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Old 2nd December 2006, 05:20 AM   #1148
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I take it there's no output inductor?
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Old 2nd December 2006, 08:42 AM   #1149
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Hi,

no, s not needed to keep it stable.

William
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Old 5th December 2006, 07:23 AM   #1150
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Quote:
Originally posted by juma
But my question was about regulated power supply for Aleph X - did someone try it ? How did it affect the sound ?
I built a higher-powered version of http://mrevil.pwp.blueyonder.co.uk/a...sub/psu2.shtml
It's a capacitor multiplier instead of fixed voltage reference so you can have a minimum voltage drop in the regulator without worrying about mains variation.
However, I haven't listened to it as I've yet to order the bulk metal foil resistors I intend to put on the Aleph-X boards. I just finished my masters and I'm looking for a job now, so it may take some time...
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