• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

OPT identification

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J

jazz

Member
Joined 2001
Hi,

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.

Regards&thanks,
Joris
 

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