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Old 22nd March 2012, 08:14 AM   #1101
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I am using 0.5R resistors in CRC filter in power supply, 22kuf-0.5R-22kuf and in the future want to use 66kuf-0.5R-66kuf and I guess I will have higher rail voltage, maybe I will try using 1R instead 0.5R in the filter so I could raise the bias a little 200-300ma per fet but I don`t know if that does woth it because I am already satisfied with output power and if I raise the bias more I will push the fets at their extremes and don`t want that
60Wpc peak or average?
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Old 22nd March 2012, 08:16 AM   #1102
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with my dmm set on Vac I can read at output 10V peaks with speaker connected(3.5ohm) and without my ear to sense any distortion but I guess there is a little bit ...
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Old 22nd March 2012, 08:17 AM   #1103
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leave it as is , regarding Iq

average
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Old 22nd March 2012, 08:26 AM   #1104
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Then I will leave it this way regarding bias and and rail voltage
It will stay on my work bench for few weeks for test(ACCG) and waiting for the cases to be ready
For the moment I don't use any grease between mosfets isolator and heatsink I only polished the region where fets came in contact with heatsink with 1000 abrasive paper so these will make better thermal contact and the surface is plane
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Old 22nd March 2012, 11:43 AM   #1105
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mica and thermal grease , if you don't have kapton or Kerafoil
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Old 22nd March 2012, 11:49 AM   #1106
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i use kapton
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Old 24th March 2012, 07:11 AM   #1107
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I have decoupled R24 from the circuit, this is really a big improvement in sound for those who want lower output power(half the original aleph power maybe less).I guess I am going to use a switch between C3 and R24 with 2x 10-15cm long wire.Will there be any problems if the wire is so long?(hope not) and one more question can I operate the switch when the amp is powered up?
I really like this amp because is so modable and very good sounding, compared it to JLH 2003 prototype which i built last summer and they are sounding almost the same but with Aleph CCS enabled, when i disconnect R24 the JLH doesn`t stand a chance(the JLH is built with ordinary recovered parts(no Dale,no Panasonic caps))
The las thing(for the moment) I want to try is to short out C1 from circuit to see sound improvements
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Old 24th March 2012, 08:17 AM   #1108
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some pics...sorry for bad quality, they are made with my phone`s camera
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Old 1st April 2012, 11:15 AM   #1109
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Quote:
Originally Posted by Nelson Pass View Post
I haven't finished the service manual for publication, but it is
quite clear that many have become impatient.

Passlabs

Thanks Mr. Pass
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Old 1st April 2012, 11:27 AM   #1110
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Quote:
Originally Posted by schultzsch View Post
I have decoupled R24 from the circuit, this is really a big improvement in sound for those who want lower output power(half the original aleph power maybe less)........
yes I have made the same experience some time ago...

and when you do not need so much power only a few Watt, give the "Simple SIT" from Mike ........later........a chance!

L’Amp: A Simple SIT Amp: Part Deux

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