Transcendent Sound Mini Beast OTL

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SteveTheShadow
Posts: 1042
Joined: Thu Sep 12, 2013 5:24 pm
Location: S Yorks
Great Britain

Transcendent Sound Mini Beast OTL

Unread post by SteveTheShadow » 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. :lol:
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:
Image

Close up of the outsides:
Image

And with the system, being soak tested on music:
Image

Pity it has to go to its owner soon :cry:
DIY NVA amplification ( roughly equivalent to NVA A60) BTE Designs passive preamp, BTE Designs Lenco L75 turntable, Rega R200 arm, Goldring E3 cartridge, NVA Phono 1
Musical Fidelity M1 DAC, AppleTV4 with Apple Music subscription, ripped CDs streamed via WD MyCloud Home Duo NAS, with PLEX media server.
Speakers - Large sealed cabs, with Fane 12-250-TC 12" full range drivers.

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Andy-831
Posts: 214
Joined: Mon Aug 07, 2017 8:34 am
Location: Lancs / Yorks Moors
Great Britain

Re: Transcendent Sound Mini Beast OTL

Unread post by Andy-831 » Wed Oct 10, 2018 8:29 pm

Beautiful Steve, been fancying trying the grounded grid preamp for a while.
Analogue
301 / 3012 / 2m black
401 / PU7 / AT33ev / Highphonics SUT
Phono 2 + extra PSU
Digital
Vortexbox, SBT / Teac Dac
Cambridge CXC
Amps
Glasshouse TVC, Tron Seven Linestage, Quad 44
Quad 303, or Bel Canto Set 40, or NG 300B Set Monoblocks
Speakers
Tannoy GRF Memory.
Tannoy ST100 Supertweeters
Q Acoustic 3020.

SteveTheShadow
Posts: 1042
Joined: Thu Sep 12, 2013 5:24 pm
Location: S Yorks
Great Britain

Re: Transcendent Sound Mini Beast OTL

Unread post by SteveTheShadow » Wed Oct 10, 2018 10:28 pm

Cheers Andy,
It was an enjoyable build. A valve NVA! :mrgreen:
Vintage JBE turntable, vintage Mayware Formula IV with Audio Technica VM540ML cart and NVA Phono1, Fane single driver speakers and OTL amp. Awesome combination! When you are able to build your own gear, or work from good kits, and fettle vintage stuff, you soon get to realise how right Richard is about most of the stuff that passes as hi-fi these days.

Bruce Rozenblit's OTLs sound fantastic with my simple sealed, single driver full range boxes. A Rozenblit "Son of Beast" 15 watt, push-pull OTL, sounded great at Owston with my Fanes. Even Richard was impressed.

Pity the newly built MIni Beast OTL isn’t mine.

I would go for the grounded grid preamp. Rozenblit's designs are excellent.
DIY NVA amplification ( roughly equivalent to NVA A60) BTE Designs passive preamp, BTE Designs Lenco L75 turntable, Rega R200 arm, Goldring E3 cartridge, NVA Phono 1
Musical Fidelity M1 DAC, AppleTV4 with Apple Music subscription, ripped CDs streamed via WD MyCloud Home Duo NAS, with PLEX media server.
Speakers - Large sealed cabs, with Fane 12-250-TC 12" full range drivers.

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