Transcendent Sound Mini Beast OTL
Posted: Wed Oct 10, 2018 6:54 pm
Started this project on Sunday for a customer of our Ant and finished it this afternoon.
The Transcendent Sound Mini Beast is a single ended output transformerless amplifier. It uses the JJ version of the EL509 TV line output pentode that was used for the line timebase output in colour TVs during the '70s.
The JJ version of the valve does not have a top cap for the high voltage connection, making the JJ much safer to use than old TV valves. It puts out 4WPC for 290W out of the wall.
However it sounds absolutely superb. Speakers less than 95dB efficient need not apply, and the speakers need to be an easy load. My big Fanes fit the bill perfectly.
Bruce Rozenblit, the designer behind Transcendent Sound is based in the USA and sells OTL kits for the adventurous hobbyist.
Below are the internals:
Close up of the outsides:
And with the system, being soak tested on music:
Pity it has to go to its owner soon
The Transcendent Sound Mini Beast is a single ended output transformerless amplifier. It uses the JJ version of the EL509 TV line output pentode that was used for the line timebase output in colour TVs during the '70s.
The JJ version of the valve does not have a top cap for the high voltage connection, making the JJ much safer to use than old TV valves. It puts out 4WPC for 290W out of the wall.
However it sounds absolutely superb. Speakers less than 95dB efficient need not apply, and the speakers need to be an easy load. My big Fanes fit the bill perfectly.
Bruce Rozenblit, the designer behind Transcendent Sound is based in the USA and sells OTL kits for the adventurous hobbyist.
Below are the internals:
Close up of the outsides:
And with the system, being soak tested on music:
Pity it has to go to its owner soon