Mullard NMOS 25W class A

Please find photos of the above. Does anyone have the original article?
NMOS amp 011.JPG
 

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Thanks gannaji. I probably got this from DIY Audio years ago! Currently chasing instability in one channel varied by R16. My PSU has four 12V 4A lighting transformers and 51,000 uF caps with inrush prevention through 10 ohms then a relay with 7 second timing. Rails 25 to 27 V.
Regards.