Is STK2038B the output stage for Technics SU-Z55?

AX816 · 11th October 2004, 05:00 PM

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?

Netlist · 11th October 2004, 06:31 PM

Here's a datasheet.
The STK2038 is definitely used in the SU-Z22 and SA350SEGR.
I can't confirm for the SU-Z55 though.

/Hugo

Emanuel · 23rd August 2005, 11:59 AM

AX816,
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?
Thanks,
Emanuel

ToMiC · 18th January 2011, 11:57 AM

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?
Thanks!

ziaulislam · 13th March 2011, 05:17 AM

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.

jaycee · 05:16 PM

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.

11th October 2004, 05:00 PM	#1
AX816 diyAudio Member Join Date: Sep 2004 Location: Timisoara	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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11th October 2004, 06:31 PM	#2
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	Here's a datasheet. The STK2038 is definitely used in the SU-Z22 and SA350SEGR. I can't confirm for the SU-Z55 though. /Hugo

23rd August 2005, 11:59 AM	#3
Emanuel diyAudio Member Join Date: Aug 2005	AX816, 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? Thanks, Emanuel

18th January 2011, 11:57 AM	#4
ToMiC diyAudio Member Join Date: Dec 2010	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? Thanks!

13th March 2011, 05:17 AM	#5
ziaulislam diyAudio Member Join Date: Feb 2008	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.