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Daft Hybrid Amp
Daft Hybrid Amp
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Old 12th June 2009, 09:01 PM   #1
316a is offline 316a  England
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I don't get it , why do all these dangerous lashups sound so good ? Had this one up for the last few weeks , started with choke loaded IRFP150 , found a bias sweetspot at 1.5A and went from there Could probably do with more current but I'd imagine the chokes are running on the ragged edge Original input valve was a 5687 , then changed to type 26 , now running 15E . Total lashup , using a voltage doubler to get 250V HT and running the 15E at 180V/2.5mA which is far too low , but it sounds good as it is The filaments of the input valves draw 20 watts each , the mosfets are running at 15 watts dissipation per device . Filament supply weighs 30kg . Not really chassis happy but never mind , I'm enjoying this thing as it is

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Old 13th June 2009, 08:40 AM   #2
Wavebourn is offline Wavebourn  United States
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Daft Hybrid Amp
My experiment with similar thingy, 5 years ago. 8AL9 tube and 2 x IRFP460
2 directly coupled stages, bipolar + / - 240V power for tube, CCS in anode (30 mA) of output stage of the tube driver.
Source follower loaded on a plain CCS. Choke filtered 40V.
Sounded like a charm, though dissipated 200w.

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Nothing in the universe is perfect. The ideal things are the ones that are most optimal. Optimization criteria, what matters. When I hear "No Compromise Design", I want to take a sledgehammer and test how impact-proof it is.
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Old 25th April 2013, 11:41 PM   #3
robot797 is offline robot797
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hey can i have the circuit of that 15E amp
i wanna build something similar but i need to explore some posibilety's
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