Revisiting some "old" ideas from 1970's - IPS, OPS - Page 215 - diyAudio
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Old 19th June 2017, 01:21 PM   #2141
diyAudio Member
Join Date: Mar 2001
Location: Brazil
Originally Posted by vzaichenko View Post
Sorry - one more pretty cool IPS module

I just came across M-02 / MX-100 front-end and realized it's designed based on the same principles I like to use these days ("Bravo Luxman engineers!"). Besides the jFET input pair (transconductance stage), all the rest of the circuit is controlled purely by current, resulting in rather high slew rate (around 100V/uS with OPS in place), low distortion with excellent profile, low phase shift at 20KHz and excellent stability margins with very light compensation. As a cool bonus - perfect clipping.

My version of the topology uses mostly TO-126 devices - most of them dissipate 150...170mW, except LTP's tail (Q3) - it runs at 450mW.

Besides BF862, 2SK170 jFETs can be used in the input pair (layout needs to be updated in this case).
Luxfront can be used with any OPS, published in this thread.
It's also compatible with Slewmaster OPS boards.

Diy-friendly layout for etching is attached (PDF).
Do you mean a something like this combo?

Interesting NFB arrangement Luxman used, as it allowed using a film cap.
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File Type: jpg Luxfront +VHEX OPS.jpg (384.0 KB, 105 views)
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