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That would do it. What is it... besides cool as shit. |
Mercury vapor rectifier?
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Finally got both the KT77 and KT66 tubes from Gold Lion burned in. Neither one has the tonal density of something like the RCA 6L6-GA, but the GL's do have their strengths. Clarity, focus, detail. And rhythm/pace. They really do boogie!
I've got a pair of Penta Labs KT88's and Gold Lion KT88's burning in right now (using a 2nd system) and they should be fully cooked in the next 3 days. I like to run in every tube for at least 200 hours before doing any serious listening. Some might even go for 300 (like the black treasure carbon coated tubes or the teflon coated Psvane tubes). |
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It's an 866 half wave mercury rectifier. Good news - it'll handle up to 5000V and it looks cool as $hit. Bad news - needs 5 amps of 2.5 filament voltage and you need two for full wave rectification. I recently stashed away a pair of 816s for my next amp build, which are a smaller mercury half wave rectifier. http://2.bp.blogspot.com/-YgqnxO0dbo...s1600/main.jpg It has the advantage of only needing 2A of filament voltage at 2.5V and can handle 7500V. Size comparison... http://4.bp.blogspot.com/-ahzyeT5g0q...comparison.jpg |
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And people thought we were nuts running mercury vapor diffusion pumps in our research vacuum rigs. Keep some flowers of sulphur around for the occasional dropped tube.
The 274B mesh-plate really is a nice sounding tube. |
While there is no question that Mercury vapor rectifier tubes look really cool when they are running, I mean probably nothing cooler, the Mercury plasma makes a huge amount of RFI and EMI that is very hard to filter out. It starts at low 100’s of kHz and goes up to 10 MHz.
Maybe it is euphonic? |
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