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Old 8th March 2013, 04:38 PM   #21
adason is offline adason  United States
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I still have an old AKAI slim looking power amp, with two STK 0050 on the output. It had switching power supply, (to make it slim and light), which died. I put big trafo and real power suply on it, and it sounds great. It has beautiful fluorescent power meter, nice to look at, that was the only reason I resurected it.
Recently I compared the AKAI to discrete amps, some JVC (SuperA) amps and old NIKKO. NIKKO beat them all, but AKAI did not sound that bad. I am using it in bi-amp system to power woofers, it can put out 50 watts, which is more than plenty. With tube amp on mid/treble, system sounds great, plus I have nice fluorescent indicator to look at. Otherwise I had some other stuff with STK modules, old Technics receiver, still working day and night in the lab, and some other ECO? or EICO? That limits my experience with STK modules. I guess they can sound decent, but it does not compare to well designed discrete transistor amp. That applies to LM series amps as well. I built few of those chipmunks, they sound ok, but they are not krell or parasound, that's for sure.
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Old 11th March 2013, 06:17 AM   #22
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When inputs are mentioned, it invariably means signal inputs designated as +Vin and -Vin. The datasheet of STK4182 does not show these pins.
For every channel, there are two input pins. For thia STK, it is pins 1and 2 for one channel and pins 17 and 18 for the other channel. When it is working, the voltage diffrence between these pins will be low. This confirms that the internals of the amp are working.

For more about 2 input pins for each channel, see LM4780 datasheet.

Gajanan Phadte
Originally Posted by tvissoc View Post
Power inputs? Signal inputs? Referencing a sample circuit, looks like the STK4182II has +Vcc on pin 11. -Vcc should hit pins 14 and 9. 10 and 13 are R/L speaker +. 1 and 18 are R/L signal inputs. 3, 16 grounded.
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Old 18th June 2013, 04:42 AM   #23
stoneku is offline stoneku  Taiwan
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I am sure STK08x series can be good sounding.

Many years ago EV (Electro-Voice) had been production studio monitor "Sentry-100A" , it had passive model and powered model. the Sentry 100 powered speaker are bi-amp with STK084 power module, it's sound very well .
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Old 24th August 2013, 01:42 PM   #24
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Thumbs up stk 4141 amp

i made a amp using the ic gives me better and unmatched audio experience.full power into 2*8'' boschmann woofers.i used 24-0-24 6A transformer.sounds good............................
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Old 13th September 2013, 10:45 AM   #25
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Default STK 401-120 replacement

I have a Sony HCD H12 Tape deck and the STK needs to be replaced..wonder if other STKs (401-140,4152II, 392-040, etc) can be used..The damaged STK is STK401-120..By the way, dont know much about STK ICs
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Old 13th September 2013, 11:20 AM   #26
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STK401 140 is a high power module and has same pin connections and the application schematic as of 120. It should work.

Confirm for yourself and use.

STK401-120 pdf, STK401-120 description, STK401-120 datasheets, STK401-120 view ::: ALLDATASHEET :::
STK401-140 pdf, STK401-140 description, STK401-140 datasheets, STK401-140 view ::: ALLDATASHEET :::

Gajanan Phadte
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Old 19th December 2013, 09:12 PM   #27
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Hi, I'm new on this forum (great stuff, can't believe i haven't found it earlier!) because I found a STK 402-040 module on a heavily damaged circuitboard I salvaged. When I researched it the specs looked quite promising so I decided to have some fun and build the application circuit provided by Sanyo. This thing rocks! It sounds very good with generous bass and brilliant mids and highs. Now I'm hooked! I'm already rebuilding the circuit into something presentable which i will post in this forum when finished.
In my research I found that Sanyo recently became part of ON-semi, ditching all old versions of the Stk series and coming up with a new line of STK 433-xxx that have on-board standby circuits i'm not sure existed in previous versions. If anyone has experience with them please let me know, I'll try one when my current build is done and post that also.
So, to answer this topic's question: Yes. STK's can sound very well! I'm impressed by the one I found and I suspect there are better sounding series.

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Old 19th December 2013, 09:16 PM   #28
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I'm aware of at least one manufacturer of industrial type multichannel audio power amps that used the Sanyo STK series of amp modules for quite a few years, with great results.
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Old 19th December 2013, 10:23 PM   #29
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There are some warnings in order though:
They're essentially unprotected devices, theż will happily release "the smoke" when mistreated. No failsafe in there. Also, keep ground as close as possible and install all necessary anti-oscillation components as they seem to oscillate pretty easy without zobels and decoupling caps right on top of the stk's leads. When I tested it without the zobel networks on the outputs it almost fried itself...
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Old 19th December 2013, 10:37 PM   #30
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I've used some STK modules (dual amplifier, e.g. 4141v, 4191v) and while they work OK the sound quality is not that great IMHO. But for something quick and dirty and when less then audiophile performance is OK, these are great.
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