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Old 15th August 2018, 01:14 PM   #8421
Lampie519 is offline Lampie519  Netherlands
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Not to be used in the summer i guess.
Try a Zotl next time, less waste of energy and better bass control especially when compared to 6AS7 tubes.
But looks nice i must say.
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Old 15th August 2018, 03:57 PM   #8422
Soundhappy is offline Soundhappy  France
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Audiomat CD2 OTL can be used in summer season just switch on the rear air fan.
Sure run very hot , and cost of 1kWh of energy is high.
Was pure class A , pure transformer less ( no output air coils or such )
huge psu transformers, build with hi quality industrial components no compromise all around.
ZOTL new generation compare to old shool Audiomat oh yeah can be interesting! Thanks and greetings
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Old 17th August 2018, 09:47 PM   #8423
jdrouin is offline jdrouin  United States
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Amp for 32 ohm headphones based on DHTRob's 5842 amp from 2002. I tweaked the power supply and used no silicone. Tube complement is all-Raytheon NOS JAN 5842s and EZ81 rectifier. I was going to paint it a modern orange but for various reasons it ended up looking more industrial than I'd envisioned. Then I stumbled upon some green hammertone paint and ended up using that. So now it looks like vintage shop equipment (or a 1930s cinema amp). It sounds great. Finally able to listen to more music at night with computers off.
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Last edited by jdrouin; 17th August 2018 at 09:50 PM.
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Old 18th August 2018, 01:16 AM   #8424
zman01 is offline zman01  Bangladesh
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Nice work jdrouin.
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Old 18th August 2018, 01:19 PM   #8425
jdrouin is offline jdrouin  United States
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Originally Posted by zman01 View Post
Nice work jdrouin.
Thanks, zman01!
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Old 26th August 2018, 08:09 PM   #8426
Soundhappy is offline Soundhappy  France
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Quote:
Originally Posted by jdrouin View Post
Then I stumbled upon some green hammertone paint and ended up using that.
So now it looks like vintage shop equipment (or a 1930s cinema amp).
It sounds great.
@ Jdrouin

Beautyful green superb DIY work congratulations!
Kindest regards
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Old 1st September 2018, 11:46 PM   #8427
wdecho is offline wdecho  United States
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My new triode strapped GU-50 build.
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Old 1st September 2018, 11:56 PM   #8428
Lampie519 is offline Lampie519  Netherlands
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Nice one! What speakers?
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Old 2nd September 2018, 12:31 AM   #8429
kasanay is offline kasanay  United States
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Sweet!
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Old 2nd September 2018, 02:03 AM   #8430
wdecho is offline wdecho  United States
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Quote:
Originally Posted by Lampie519 View Post
Nice one! What speakers?
Heavily modified Klipsch LaScala speakers. Different horn (Altec 511b) different driver (Selenium D250X) with baby cheeks horn and Eminence driver. Only part of Klipsch used is the bass bin. Biggest gain is better sound stage.

I really like the GU-50 tube when used as a strapped triode. Bass like a SS amp with mids as a true triode tube. The design is based on a Chinese amplifier being sold on Ebay. I bought the kit last year for something like $250 shipped and I liked the way it sound so much I decided to build another one with quality iron and better parts. I used carbon film resistors everywhere but the GU-50 cathode bias resistor which is 5 watts. Hammond PS trans with Edcor OPT's. Nothing exotic or terrible expensive. If anyone is interested I can PM schematic. The schematic calls for some feedback but I eliminated it on this build. Looks better using Arta without feedback.

Last edited by wdecho; 2nd September 2018 at 02:10 AM.
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