A Bit of valve history...
#1 A Bit of valve history...
Having finished the kitchen alterations last weekend, and now planning how the new hifi room will look ...I'm having a breather this week.. came across this titbit..
i'm sure you all knew the detail.. but its nice to read this quote..
This interesting piece written by Lynn Olson may provide some of the explanation. A Tiny History of High Fidelity.
"In 1926, '71A direct-heated power triode was introduced, followed by the '50 in 1928, the '45 and PX4 in 1929, the PX25 in 1930, the 2A3 in 1932, the 300A in 1936, and the 300B in 1938. The power race started in earnest with the 6L6 and KT66 pentode in 1936, followed by the ubiquitous EL34 in 1951, the EL84 in 1953, the 6550 and KT88 in 1954, and last in the series, the 7591 in 1959 and the 8417 in 1963. (The 6L6 has been in continuous production since 1936, a record unmatched by any other electronic device - we all owe the electric-guitar players a big thank you for keeping the tube factories open.)
Seventy years later, vacuum tubes, and especially triodes, continue to be the lowest distortion amplifying elements ever made. No germanium or silicon transistor, JFET, or MOSFET has ever approached the distortion performance of the direct-heated triodes, with indirect-heated triodes following closely behind. In addition to low distortion in the absolute sense, the distortion spectra of triodes is favorable, with a rapid fall-off of the upper harmonics. (This is less true for beam tetrodes, pentodes, or solid-state devices, which are intrinsically less linear and have higher-order distortion curves.)"
i'm sure you all knew the detail.. but its nice to read this quote..
This interesting piece written by Lynn Olson may provide some of the explanation. A Tiny History of High Fidelity.
"In 1926, '71A direct-heated power triode was introduced, followed by the '50 in 1928, the '45 and PX4 in 1929, the PX25 in 1930, the 2A3 in 1932, the 300A in 1936, and the 300B in 1938. The power race started in earnest with the 6L6 and KT66 pentode in 1936, followed by the ubiquitous EL34 in 1951, the EL84 in 1953, the 6550 and KT88 in 1954, and last in the series, the 7591 in 1959 and the 8417 in 1963. (The 6L6 has been in continuous production since 1936, a record unmatched by any other electronic device - we all owe the electric-guitar players a big thank you for keeping the tube factories open.)
Seventy years later, vacuum tubes, and especially triodes, continue to be the lowest distortion amplifying elements ever made. No germanium or silicon transistor, JFET, or MOSFET has ever approached the distortion performance of the direct-heated triodes, with indirect-heated triodes following closely behind. In addition to low distortion in the absolute sense, the distortion spectra of triodes is favorable, with a rapid fall-off of the upper harmonics. (This is less true for beam tetrodes, pentodes, or solid-state devices, which are intrinsically less linear and have higher-order distortion curves.)"
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- Old Hand
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#4
Thoughts are just little stories that our brains tell us !
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#6
If strange postings appear under your name Steve we'll know you forgot to log out when you went to make a cup of tea!
"Two things are infinite, the universe and human stupidity, and I am not yet completely sure about the universe." – Albert Einstein
#7
yes.. daughters... she needs banning Nick,,,please...
getting more like her dad every day... sad
getting more like her dad every day... sad
The tube manual is quite like a telephone book. The number of it perfect. It is useful to make it possible to speak with a girl. But we can't see her beautiful face from the telephone number
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#8
I would consider it a welcome and healthy thing for a family to want to see what we get up to on here. If only mine showed the slightest bit of interest?
My family enjoying the Lakes
My family enjoying the Lakes
"Two things are infinite, the universe and human stupidity, and I am not yet completely sure about the universe." – Albert Einstein
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#10
Chip off the old block ?sarah-s wrote:Before you know it I'll be making speakers and collecting valves...
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G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
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#13 Re: A Bit of valve history...
Well duh, triodes have inherent negative feedback, bipolars FETs & pentodes are variable current sources with identical type 'curves'.steve s wrote:Seventy years later, vacuum tubes, and especially triodes, continue to be the lowest distortion amplifying elements ever made. No germanium or silicon transistor, JFET, or MOSFET has ever approached the distortion performance of the direct-heated triodes, with indirect-heated triodes following closely behind.
http://livinginthepast-audioweb.co.uk/p ... ockman.pdf
Discuss....
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
#14
he needs a husband first Shane... at 15... a way off i hope...shane wrote:I trust the speakers would have a suitable HAF factor...sarah-s wrote:Before you know it I'll be making speakers and collecting valves...
The tube manual is quite like a telephone book. The number of it perfect. It is useful to make it possible to speak with a girl. But we can't see her beautiful face from the telephone number