You might find this interesting: the Philips EL6471 1000 watt tube amplifier. Not exactly a DIY build, however. 🙂
Pope 85A2 cold-cathode reference tube (glow discharge). The Pope looks prettier than most 85A2s because the molybdenum layer on its glass is relatively thin, so you can still see through it.
Yes, this 1 kW 300 pounds boatanchor really is a monster! And Charles Marie Widor's Toccata from his 5th organ symphony is overly appropriate to show it's capabilities. Now imagine you're listening to it through a speaker system capable of 1000 watts!
(In his comments the original uploader states he used a dummy load and some smaller speaker that was connected via a voltage divider.)
Best regards!
Nothing wrong with thoriated tungsten filaments, eh? Here, a couple of 10Ys.
This thread is a lot of fun.
This thread is a lot of fun.
Nice samples 12AX7.
'55 mc1 with green/red logos.
'54 select tube (test perfect balance).
'57 box plate square getter from top mica.
'55 mc1 with green/red logos.
'54 select tube (test perfect balance).
'57 box plate square getter from top mica.
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1950's sealed ST type
1950's red print radiotron GEC Z729
Steel Wheels - 5B/255M
1950's red print radiotron GEC Z729
Steel Wheels - 5B/255M
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Yes, they're pretty pretty 😆! Btw, has STC, the original manufacturer of those tubes, been merged with ITT?
Best regards!
Best regards!
