I found a little info about Pyramid amps (not your specific model though). Here's the link:

http://www.adleraudio.com/prod.asp?dept_id=664

Based on the prices, I wouldn't expect too much. You did get it at a good price though.

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http://www.belmontgroup.com/images/300Ewcolor.jpg

'88 300E 265K
'91 300TE 155K