I need the Sima W-3050 or W-2002 schematic

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#3
seems such schematic is not in internet
i did some google - but nothing found 🙁

i am sure some other member would have a schematic
so, if you are lucky here you may have one emailed within 1 week

otherwise, i would say you can try to get in contact with the designer
Victor Sima .. or the people around him

An externally hosted image should be here but it was not working when we last tested it.
Victor Sima
Proud creator of the entire Linar line as well as
founder and ex-owner of SimAudio
( from this page: http://www.linaraudio.com/NYshow.htm )
Click to expand...
The email to Linar Audio is:
linar (at) vif.com

regards 🙂
 
#4
If it resembles Linar, maybe this can help you. It's non-global feedback amp, servo, DC coupled. Output transistors and input fets are erased, they could be C5200 and K170?
 

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#6
Hi, my 3050 lost one Ch...

so I to find out I took the board the drew the schematic. I have it on paper somewhere. It uses double diff. pair on input (mpsa 8099, 8599), MPSU07, 57 as predrivers and the MJE15030/21 as drivers and MJ15023/24 out trans. I have problem getting the MPSU07/57 as the smoked 🙁, maybe there are newer transistors that could be used as the predriver pair . I thing Victor will not be pissed if send the schematic ( I have to drew it on the Spice) , since all his new amps are no feedback design.
mail me back:xeye:
 
#7
Re: Hi, my 3050 lost one Ch...

pliedtka said:
so I to find out I took the board the drew the schematic. I have it on paper somewhere. It uses double diff. pair on input (mpsa 8099, 8599), MPSU07, 57 as predrivers and the MJE15030/21 as drivers and MJ15023/24 out trans. I have problem getting the MPSU07/57 as the smoked 🙁, maybe there are newer transistors that could be used as the predriver pair . I thing Victor will not be pissed if send the schematic ( I have to drew it on the Spice) , since all his new amps are no feedback design.
mail me back:xeye:
Click to expand...

Hello

I would be very please if you can send it to me by email.

I have sent you a private message.

Thank a lot

Gaetan
 
#8
Re: Hi, my 3050 lost one Ch...

pliedtka said:
MPSU07, 57 as predrivers and the MJE15030/21 as drivers and MJ15023/24 out trans. I have problem getting the MPSU07/57 as the smoked 🙁, maybe there are newer transistors that could be used as the predriver pair ...
Click to expand...


Hello

MPSU07, 57 as predrivers, I presume it is the transistor for the VAS, those MPSU are slow at 50 mhz, but using much faster modern transistors like 2SC4793, 2SA1837, KSC3503, etc.. may need to change the value of the cdom capacitor, but the BD139 and BD140 would do the job since they are just a bit faster than the MPSU transistors.

Gaetan
 
#9
Hej

"like 2SC4793, 2SA1837, KSC3503" I though about the 2SA1837/2SC4793 pair. The BD139/140 is older design might not even be faster than the MPSU's 50-100MHz, what is interesting about the MPSU07/57 is that the Cbo is only 6-12pF (Vcb=10V, Ie=0 f=100khz). Have no idea why Victor used then. Then there is Unisonic (UTC) 2SD669 with low Cbo as well. Also Toshiba 2SA1930/2SC5171 seems OK.
Sorry but I worked on W-kend and didn't do SPICE work for you. My 3050 has 4 transformers instead of two as in original units - maybe two drive low impedance spkr. It's an OK amp, transparent, not soft or romantic, nothing like the later non feedback Celeste 4070(se), 4150 or the latest from Linear, which use MJL21192/93 in the output, I assume. One think I learned from the ordeal: don't bias the output trans more than 10mA per MJ15022/23. Originally they are biased around 5mA (but it did lower the harmonic distortions as my Clio showed)

:att'n:

Paul
 
#10
lumanauw said:
If it resembles Linar, maybe this can help you. It's non-global feedback amp, servo, DC coupled. Output transistors and input fets are erased, they could be C5200 and K170?
Click to expand...

Hello

I've open the Linar amp of a friend, we can't see the number on the output transistors, but after asking mr. Sima, it is mosfet output transistors, but I did not give me to number of those mosfet.

Bye

Gaetan
 
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#12
HEY, CAN YOU DO REVERVSE INGENEERING FROM THE PCB BOARD TO THE CAD. The input should be the same as any regular amp, since it's non feedback the gain will be lower and open loop fc freq. resp in the 100+khz area. The outputs could be Mosfets variety just like Nelson Pass, Borbely, "Anthony the saint" is using. I would like to see the the topology and schrmatic, not because I wish to copy one (I bet some people do), but to see how Victor implemented the non-feedback in his amps. LC AUDIO sells non-feedback amp kits, Gryphon and others also use non-feedback designs.

paul
 
#13
lumanauw said:
If it resembles Linar, maybe this can help you. It's non-global feedback amp, servo, DC coupled. Output transistors and input fets are erased, they could be C5200 and K170?
Click to expand...

Hello

Wich linar are this Linar amp ?

A friend of mine have a Linar 10 amp, it's a five channel amp.

One channel are burn wen he turn the amp on, the output mosfet and the driver transistors need to be replace, but the numbers on the transistors are erased.

Anybody do know wich output mosfet and driver transistors are used in the Linar 10 amp ?

Are the output could be lateral mosfet ?

Thank you

Bye

Gaetan
 
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#14
Need help with a Sima W-2002 power amp.

Hello

I have to fix, for a friend, a Sima W-2002 power amp.

That amp at low to medium power output work ok, but wen I crank-up the volume the left channel lost all power.
The power supply voltage are ok and the power supply capacitor are new.

Any hints ?

Btw, anybody do have the chematic of the Sima W-2002

Thank you

Bye

Gaetan
 
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