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Old 26th October 2013, 06:46 AM   #931
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I also did a more "original" version with lowish (~3ma) IDSS 2SK170/J74 GR and original transistor for all stages except the outputs, that were modern onsemis. (NJW3281G / NJW1302G) It was biased at around 550mA.

Heres a THD vs power plot at 1kHz.
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Old 26th October 2013, 04:45 PM   #932
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Did someone ever tried to reduce the Emitter resistor.
I think the 1R a bit to high.
When the amplifier was developed the main goal was to drive tweeters with.
So many people who built the amp among me to wrote the Le Monstre luck the deep-deep bass.
Probably It has to do something with that high 1R emitter resistor.
I have some experience when I increased the emitter resistor that somehow cut into the dynamic and bass with other amplifiers.
May be if we reduce the emitter resistor from 1R to 0R33 or so the amplifier will be unstable or the power transistors will get very high current.
I think these need to be done (at least tested) step by step, from 1R slowly reduce the value..
I built several Le Monstre but I never tested these, to build one now just to test it that would be a waste of time, energy and money.
Any idea opinion about these taught welcome.
Greetings Gabor
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Old 26th October 2013, 05:06 PM   #933
osscar is offline osscar  Latvia
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IMHO le monstre are more sensitive to the speaker type. Its measures well with Full range, but with 2way speakers you have dips and peaks in response (attached LT sims, but in real life its almost the same - i measured once with sound card on real speakers). You can bypass source resistors with caps -
See attached pictures. 1st - no caps, 2nd - with 100uf bypass
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File Type: jpg bypass_caps.jpg (45.5 KB, 733 views)
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Old 28th October 2013, 08:29 AM   #934
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Originally Posted by osscar View Post
IMHO le monstre are more sensitive to the speaker type. Its measures well with Full range, but with 2way speakers you have dips and peaks in response (attached LT sims, but in real life its almost the same - i measured once with sound card on real speakers). You can bypass source resistors with caps -
See attached pictures. 1st - no caps, 2nd - with 100uf bypass
Of course it is sensitive, because it has a high output impedance. Every crossover will show up in the chart.
What can be done is have balancing filter sections to smooth the impedance.
All this is the same for tube amplifiers.
However some find that with high sensitive speakers the extra sections also 'suck' some livelihood.
  • But I like your idea !
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Old 1st November 2013, 02:00 PM   #935
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A quick question about the alpeh M 10 watt boards. Do they have to be driven balanced?

Pass ALEPH-M DIY Class-A amplifier PCB
Still waiting patiently for a answer on this one
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Old 1st November 2013, 02:05 PM   #936
Zen Mod is offline Zen Mod  Serbia
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ask KK

(it can be driven either bal or unbal ; for later , ground neg. input)
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Old 17th February 2014, 03:48 PM   #937
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I can use: k170-j74 > C2240-A970 > A965-C2235 > A1490-C3854 ??????
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Old 7th March 2014, 10:34 PM   #938
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Originally Posted by Le Thien Thanh View Post
I can use: k170-j74 > C2240-A970 > A965-C2235 > A1490-C3854 ??????
I don't think, that using Toshiba 2sc2235+2sa965 as drivers is good idea. Maybe Sanyo 2sc3468+2sa1371 (3467+1370) will be better (but I'm not sure). In the theory as driver you can to use Motorola BC550C+BC560C with small radiators (I'm not sure too).

p.s.: sorry for my english
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Old 29th March 2014, 08:56 PM   #939
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Default smps le monstre

Here is a first amplifier build of my le monster on the cheap (I am a beginner in building amps so don't be too hard on me):

WOHNZIMMER-PC - WIN_20140329_154601.JPG
WOHNZIMMER-PC - WIN_20140329_154616.JPG

I had two RS switch mode power supplies (+/-12V, 1.8A) lying around and had found not too expensive preassembled old version boards from diy-audio-world on eBay. The boards use some changed components (power resistors e.g. would be better if non-inductive) and use K246_GR2k / L4f transistors and tip3055 / tip2955 output transistors. The case from modushop was expensive but is nice and has room for a second channel if I add a tweeter to my frugal horn speaker, or decide to upgrade to amore powerful pass f5 build.

The sound of the smps le monster is pretty good, comparing it to a miniwatt 2.5Watt single ended tube amp, I am happy, my le monster might have slightly more attack in the highs. There is slight hum in the high sensitivity foster drivers, but not too bad, and I think I can improve shielding from the sips (funny thing is that hum is reduced when touching the shield of cinch input). However I have slight problems adjusting the dc offset for one channel, as it fluctuates and is super sensitive on the potentiometer setting. This channel also is slightly louder. Both power supplies deliver stable +/-12.2V and the bias current is a perfectly stable 0.6A for each transistor.

Does anyone have tips how to reduce the amplification of the louder channel and why the balancing in this channel might be trickier?
Thanks, Stefan

Last edited by yoshisoakland; 29th March 2014 at 09:24 PM.
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Old 30th March 2014, 10:24 AM   #940
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This is what I propose to build with the parts at hand

Shoog
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