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Old 23rd April 2010, 03:48 PM   #1
jazz is offline jazz  Netherlands
diyAudio Member
Join Date: Dec 2001
Location: leiden, physically that is...
Default OPT identification


I would like to ask for your help and confirmation. I've bought a couple of second hand opt's but have very little info about them. I've tried to map the windings but i'm not confident.

The trannies where bought as advertised for KT88/EL34 tubes and having a primary impedance of 6K. The core (laminations) seems to be something like ei96 (8,5/7/3 cm).

My personal guess would be a pp trannie with a primary of about 6k, 25 - 30 Watt output rating. secndary aimed at 8R. Below is a doc of the measurements.

Any advise, confirmation is welcome. I'm sort a thinking pp 2a3 given that if it's push pull it would be triode mode and then that is first on the list before the 50w pp kt88 monster.

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File Type: doc opt.doc (40.0 KB, 30 views)
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