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wrote:

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These are metal 6L6s that belong in an antique radio and nowhere,
nowhere, nowhere else.

From the ascetics point of view I would agree--but I seem to remember that
glass tubes were created because people wanted to see the glow and the price
was lower.

Are the metal tubes actually inferior in sound???

"Bret Ludwig" wrote in message
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wrote:

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These are metal 6L6s that belong in an antique radio and nowhere,
nowhere, nowhere else.

TubesForAll wrote:
From the ascetics point of view I would agree--but I seem to remember that
glass tubes were created because people wanted to see the glow and the price
was lower.

Are the metal tubes actually inferior in sound???

No, glass tubes came first because tubes were an offshoot of lightbulb
technology and glass was easier to evacuate.

The metal 6L6 is not "inferior in sound"- it is a tube whose CCS
ratings are far lower than later 6L6 variants and therefore unless the
amp was designed for their lower plate dissipation and voltage level
ratings they will be operated out of spec and probably die young. They
will also stink like hell unless stripped, defacing them cosmetically.

Metal 6V6s can be used in any circuit designed within book 6V6
parameters interchangeably with the glass ones, but that's not true of
6L6s. I think plate dissipation on metal 6L6s is like 19 watts.

An aside: at one time a lot of hams built transmitters using a pair of
6L6 metal tubes upside-down in a water pan. They would get as much as
50 or 60 watts out of each in intermittent Morse service. They died
young, of course, but because metal 6L6s were dirt-cheap surplus they
didn't care.

The metal 6L6 is now somewhat rare and should be left to radio
collectors. Any radio collector wanting them will trade for modern
glass ones.