lp's which never touched a transistor - how far back..? - diyAudio
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Old 18th June 2015, 08:39 PM   #1
freddi is offline freddi  United States
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Default lp's which never touched a transistor - how far back..?

must one go to ensure a pure vacuum tube audio chain from mic to cutter? would there be a goodly amount of music ?
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Old 18th June 2015, 08:42 PM   #2
infinia is offline infinia  United States
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early 60's and beyond, mid sixties is mixed. so some might ask touched by op-amps. weird
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Old 18th June 2015, 09:12 PM   #3
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Interesting question. The first germanium transistor is dated at '47 and silicon transistor production at '54 Wikipedia entry dates the first all transistor car radio in '55. So how many years it took before they were considered good enough to use in recording equipment?

A search on ebay of "1950s LP" got 4,219 hits, and there will be at least a few times that number that were listed by the lp title and no mention of 1950. Fewer for 1940's (137) and most of those look to be reissues.
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Old 18th June 2015, 09:18 PM   #4
infinia is offline infinia  United States
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touched by magnetic tape hiss would be a more valid Q in my mind
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Old 18th June 2015, 09:33 PM   #5
infinia is offline infinia  United States
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yeah 12V was perfect for the 1st transistor apps.
mechanical multi-vibrator radio supplies were rotten
the 1st transistors cost several times the best single low noise tube I reckon
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Last edited by infinia; 18th June 2015 at 09:54 PM.
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Old 22nd June 2015, 04:12 PM   #6
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So did mixing desks have valves in?

Cool.

Chris (born in the mid-90s)
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Old 23rd June 2015, 03:39 AM   #7
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Quote:
Originally Posted by chris661 View Post
So did mixing desks have valves in?

Cool.

Chris (born in the mid-90s)
The Altec mixer shown in this photo (was the model number "915"?) is a vacuum tube design. I think it dates from the early 1960's; the photo is labeled "1979". The studio is not a recording studio - it's a small-town AM radio station in upper Michigan, just a few hundred yards from a branch of Lake Superior - but it demonstrates that tube-type equipment hung on in some places long after it was technically obsolete.

No, that is NOT me in the photo - but unless the housekeeping service changed dramatically when WHDF became WCCY, my fingerprints were probably still on that studio equipment when the photo was taken.

Behind the glass there is (or, there was) a Western Electric 25B mixer (1940's), and a pair of Ampex 200 reel tape decks.

Dale
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Old 30th June 2015, 07:01 PM   #8
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by chris661 View Post
So did mixing desks have valves in?

Cool.

Chris (born in the mid-90s)

certainly even as late as into the mid 70s
Dave Grohl's Sound City explores the human element of music through a Neve mixing console - Oregon Music News Oregon Music News

"Sound City" a great love story to both music itself, and at least one very old school studio - definitely worth watching. The discography of popular music that came from that grubby little hole in the wall is astounding.

But of course how far back you'd have to go to ensure all valves in the several potential stages of electronics upstream of mixing desk is another story, and yes the tape hiss pre-dolby or other NR solutions could add as much "crud" as well executed SS electronics.
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Old Yesterday, 01:12 AM   #9
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I bought a record player in the early 1970's and that just had valves inside it.
Being a car mechanic at the time I was always inquisitive as to how things worked so took the panel off to see inside.
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Old Yesterday, 02:35 AM   #10
rayma is online now rayma  United States
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must one go to ensure a pure vacuum tube audio chain from mic to cutter? would there be a goodly amount of music ?
Sheffield Labs ran all tubes on their direct to disc LPs.
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