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Is STK2038B the output stage for Technics SU-Z55?
Is STK2038B the output stage for Technics SU-Z55?
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Old 11th October 2004, 05:00 PM   #1
AX816 is offline AX816  Romania
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Default Is STK2038B the output stage for Technics SU-Z55?

I've recently aquired an old Technics SU-Z55, but the final stage has been changed with an 2n3055 based ampli though the original PCB has been maintained in the case obviously without the questioned IC.I whant to restore it but i don't know wich STK is it.On a polish forum a found mentioned to Technics SU-Z55 the STK2038B but i'm not sure.Can someone give me a hint,or a STK2038B datasheet?
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Old 11th October 2004, 06:31 PM   #2
Netlist is offline Netlist  Belgium
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Here's a datasheet.
The STK2038 is definitely used in the SU-Z22 and SA350SEGR.
I can't confirm for the SU-Z55 though.

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Old 23rd August 2005, 11:59 AM   #3
Emanuel is offline Emanuel  Brazil
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Yes, it is the STK 2038B. For sure, since I opened my SU-Z55.
By the way. My amplifier is only giving hard noise. I starter yet to find defected components. Do you know how I can obtain a schematic of the SU-Z55?
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Old 18th January 2011, 11:57 AM   #4
ToMiC is offline ToMiC
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What other chips i can use for this amp as replacement?
Here in serbia i only found STK2038 IIcl
Can it be used for this amp?
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Old 13th March 2011, 05:17 AM   #5
ziaulislam is offline ziaulislam  Pakistan
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ToMic !
Yes you can use this IC
Compnies some time use B or ll for some resions(wich they know)
but the specs are same go for it.
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Old 14th March 2011, 05:08 PM   #6
jaycee is online now jaycee  United Kingdom
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It does indeed use the STK2038 however these modules are long obsolete, and also unreliable. Here is a rather bad schematic copy I found online.

The one I got from Freecycle was also dead. I decided it was not worth repairing and gutted it for parts.

Emanuel, either the STK2038, the AN7062, or both will be dead. The SU-Z55 is not a good design at all.
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Last edited by jaycee; 14th March 2011 at 05:16 PM.
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