Old Marshall plexi clone problem

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So, I got this amp 2 years ago, traded a ProCo Rat clone and 6000 dinars (about 70$) for it. Great plexi tone and very loud. I think it was made somewhere in Yugoslavia, probably in the '70s. It has some weird tubes in it - 3xECC83, 2xEL503 and one ECL82. Had no problems until now... Turned it on the other day and there was no guitar sound, just a moderate hum that got a bit louder by turning the volume knob. I tried changing the preamp tubes but no good. Any ideas?

Pics:
http://www.diyaudio.com/forums/view-source:http://i43.tinypic.com/n6rl8o.jpghttp://i43.tinypic.com/n6rl8o.jpg
http://i39.tinypic.com/10oegrn.jpg
http://i44.tinypic.com/m79yls.jpg
 
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This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.