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Where are the 833 amps?
Where are the 833 amps?
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Old 18th January 2019, 03:03 PM   #301
hpeter is offline hpeter  Slovakia
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i tought the 2a3 will be headphone endgame, but there is something extra in thorium and graphite to sound.............

on ebay once were cheap 801as ... did not bought them
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..BLOG.. XMOS_U8/PCM5102A > LL1544A > 6H9C+gyrator > 2A3_SOV/JJ > LL1660 > STAX SR207 _ SR L300 _ SR007 # LL2748 > 394A > LC 12H/1000 // 4-125a test
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Old 18th January 2019, 05:02 PM   #302
drbarney1 is offline drbarney1  United States
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Vinylsavor recommends the 801 but you really have to filter tungsten cathodes or they will hum. It might work with higher impedance headphones. Consider the 45 which you can heat with a 2.5 center tap transformer and the center tap to the cathode resistor with a capacitor in parallel to the resistor for no feedback and lower output impedance.

It would be fun to see a youtube video of an 833-A or even a GM-100 driving headphones with the listener's head exploding like in that ridiculous movie Scanners where you could see if you look for it the difficulty the actors have keeping straight faces while filming it.
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Old 19th January 2019, 08:44 AM   #303
thuanth43 is offline thuanth43  Viet Nam
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Quote:
Originally Posted by hpeter View Post
i tought the 2a3 will be headphone endgame, but there is something extra in thorium and graphite to sound.............

on ebay once were cheap 801as ... did not bought them
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Old 19th January 2019, 01:15 PM   #304
hpeter is offline hpeter  Slovakia
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Originally Posted by thuanth43 View Post
ayyyyyyyyy ha !

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