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Old 24th March 2011, 04:58 PM   #1
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Default LU BLAME. 200 Watt power quality. (Lineup Blameless by D.Self concept)

This amplifier takes a lot from Douglas Self blameless.
It is amazing how easy we can make a very low distortion amplifier.
Does not take much.

Power is with low THD
200 Watt in 2 Ohm
100 Watt in 4 Ohm
50 Watt in 8 Ohm
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Old 24th March 2011, 06:54 PM   #2
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THD is at max nominal output. See images.
8 Ohm - 0.0011%
4 Ohm - 0.0012%
2 Ohm - 0.0016%
Attached Images
File Type: png 200w-2ohm.png (6.7 KB, 326 views)
File Type: png 100w-4ohm.png (6.6 KB, 315 views)
File Type: png 50w-8ohm.png (6.6 KB, 314 views)
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Old 24th March 2011, 07:21 PM   #3
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All just #'s , man ! Add TMC and that drops to .00008%. In real life , layout and parts selection (Mje350 vs. 2sa1381 , etc.) will make more impact (below). Choices of cascoding and LTP device selection are the only remaining factors as the THD is so low that noise,hum and PSRR become the only remaining considerations.

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File Type: jpg Ax1.3vb_photo.jpg (161.0 KB, 308 views)
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Old 24th March 2011, 07:27 PM   #4
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The input uses one pair of JFETs.
This avoids any troubles and capacitor to fix DC-Offset.
Minimum of currents gives minimum of offset voltage.

Tha gain is set for nominal 1 Volt RMS input. Gv = 21

JFET pair runs at 4 mA each. Are 2SK170GR, 5 mA devices.
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Old 24th March 2011, 07:33 PM   #5
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What is one TMC, ostripper.
I have never used one. Are they expensive.

Real life.
Unfortunately I have no possibility to build anything.
I know most posters here understand this is is a careful SPICE design.
This is absolutely no secret.
Those who wants good amplifier can do so ... or not.
I have seen people build many amplifiers of more crappy quality.
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Old 24th March 2011, 07:38 PM   #6
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OPS is also a factor , add a triple EF or a lateral as output stage and you can refine the amp for the purpose intended. THD and the "charactor " of the resulting amp will be changed. TMC is just a "hat trick" discussed in the Cordell thread that will , in real life, allow the amp to sound "first watt" at 100 watts.

The resulting amp is pure "wire with gain" (below).. add a cascode for Jfet or super low noise IPS.

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Last edited by ostripper; 24th March 2011 at 07:41 PM.
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Old 24th March 2011, 08:09 PM   #7
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Top of input is a mirror. fig.1

VAS are 2 transistors in complementary foldback. fig.2
VAS is biased by a current source 5 mA
VAS supply lines are filtered 4.7 Ohm 2.200uF
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File Type: png vas.png (5.0 KB, 52 views)
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Old 24th March 2011, 08:17 PM   #8
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Output. fig.1
3 pairs MJL3281A/1302A driven by BD139/140
0.22 Ohms emitter resistors
VBE multiplier one BD139
All red transistors on heatsink
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Old 24th March 2011, 08:24 PM   #9
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Your OPS looks "wrong" , my example is "tried and true" (2.2R basestoppers - EF2 with 220R/10uF- driver Re/"charge suckout cap"). 3 pair is good for 4R sub use (I have one of them, too).
1k B-E resistor ???
PS - the .01R's are just to test for driver currents...


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Last edited by ostripper; 24th March 2011 at 08:34 PM.
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Old 24th March 2011, 08:32 PM   #10
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Here finally the complete Lu Blame.
Lu Blame
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