1-429-999-11 transformer from Sony mini system

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davidus

Member
Joined 2013
Hi everyone.

I've got pretty decent transformer from old Sony mini system (HCD-D60/GR7/GR7J/RX70). HCD-GR7J to be precise.

It works from 115/220V and has dual 31VAC as main supply rails, plus several low voltage rails.

Does anyone have any additional information on these transformers: max current, rated power etc.

Any help will be much-much appreciated.
Thanks
 

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davidus

Member
Joined 2013
osscar said:
Hi,
these systems usually have STK chips inside , I think yoy will get some 2x80W per channel @8 ohm load with some +-45V rails from this transformer
Click to expand...

Dear osscar, thank you for response.
Yes, you are definitely right. There was single STK-4182II inside, and it worked in stereo mode (no any surround speakers).
I have strong feeling that this trafo is capable to do more than just drive min 45wx2 as it stated in datasheet.
 
osscar

osscar

Member
Joined 2009
SONY has different output power ( 2x100 for USA :D) and different STK chips in each region - I don't know if the transformers also are different. The weight of this type 200VA transformer should be about 3-3.5 kg approx. But based on on your picture - I don't think it would be much bigger ..for 2x 100W continuous output its seems too small...the relatively high AC secondary voltage indicates that it is designed for an 8 ohm load.
 
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davidus

Member
Joined 2013
osscar said:
will work fine, of course below max claimed output power, but for music it will be perfectly adequate.
Click to expand...

osscar, thank you for your responses. Much appreciated.
I think I will use a little bigger case, so I can upgrade trafo to more powerful one.
Yes, it will be used at home and max 30-40 watts will be more than enough for my place. I do not like wall shaking level of music.
 
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