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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment. |
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18th Mar 2023, 10:47 am | #61 |
Dekatron
Join Date: Sep 2007
Location: Oxfordshire, UK.
Posts: 4,310
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Re: Parallel single ended valve amps, any experience?
I confess I only mentioned the 304TL because, as per the thread title, it really is four separate triodes in parallel in the same envelope (Eimac would sell you just one, as the 75TL, or two - yes, you guessed it - as the 152TL, but somehow the 304TL seems to have been the most popular). There was a higher-mu version too, called, unimaginatively, the 304TH.
Cheers, GJ
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19th Mar 2023, 1:21 pm | #62 | ||
Octode
Join Date: Mar 2016
Location: London, UK.
Posts: 1,046
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Re: Parallel single ended valve amps, any experience?
Quote:
You can see the AES aricle here: https://www.technicalaudio.com/pdf/F...rchild_641.pdf Quote:
edit - lots of selenium in that PSU by the looks of it! Last edited by knobtwiddler; 19th Mar 2023 at 1:27 pm. |
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19th Mar 2023, 1:42 pm | #63 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,800
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Re: Parallel single ended valve amps, any experience?
I wasn't saying that 4CX250b cannot be made stable, just that it's an epic task and whoever did it with audio sized values around it probably won a medal. Full power needs 2kV so that output transformer is going to be wild!
David
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19th Mar 2023, 2:44 pm | #64 | |
Octode
Join Date: Mar 2016
Location: London, UK.
Posts: 1,046
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Re: Parallel single ended valve amps, any experience?
Quote:
Maybe all the 641 amps have been snapped up by wealthy audiophiles and used as home amps...This has occurred with the Technics SP-02 lathe motor. In Japan, you see whole Neumann lathes as home playback decks... NB - the head Fairchild designer, Mr Narma, is held in high regard in academic circles. He also designed the 670 limiter. https://www.aes.org/aeshc/jaes.obit/...7_11_PG931.pdf |
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