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ketron281989
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Post subject: Question on a 6SN7GT & GTA tube  Posted: May Fri 11, 2012 1:46 pm |
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Joined: Jul Mon 11, 2011 9:04 pm
Posts: 412
Location: De Queen, AR
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Hi guys is the 6SN7GT the same as the 6SN7GTA variant, also is this tube a octal type or miniature? Thanks
Jon
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Burnt Fingers
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Post subject: Re: Question on a 6SN7GT & GTA tube Posted: May Fri 11, 2012 2:03 pm |
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Joined: Oct Sat 20, 2007 3:36 am
Posts: 13596
Location: New Hampshire
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For 99.44% of humanity all 6SN7's are interchangable. Audiofools and early AC/DC TV's are a few exceptions  Carl
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terry h
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Post subject: Re: Question on a 6SN7GT & GTA tube Posted: May Fri 11, 2012 3:53 pm |
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 10088
Location: Valley City ND USA
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BigBandsMan
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Post subject: Re: Question on a 6SN7GT & GTA tube Posted: May Fri 11, 2012 4:27 pm |
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 6037
Location: Raleigh NC USA
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Burnt Fingers wrote: For 99.44% of humanity all 6SN7's are interchangable. Audiofools and early AC/DC TV's are a few exceptions Carl +1. The 6SN7GTB had a heater with a controlled warmup time (11 seconds) for use in TV's with series heater strings. Otherwise, there is nothing significant to choose among GT, GTA and GTB.  Larry
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It don't make a go if it ain't got that GLOW!
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Norm Leal
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Post subject: Re: Question on a 6SN7GT & GTA tube Posted: May Fri 11, 2012 5:56 pm |
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 28969
Location: Livermore, CA
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For our use 6SN7GT, A and B are interchangeable however there are differences. 6SN7GTA was upgraded to make a better Vertical Deflection Amplifier in TV. Max plate voltage was increased from 300 to 450. Plate dissipation increased from 3.5 to 5 watts.
As Larry mentioned "B" added controlled heater warmup time to "A" specs.
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Norm
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codefox
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Post subject: Re: Question on a 6SN7GT & GTA tube Posted: May Fri 11, 2012 7:07 pm |
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Joined: Nov Sat 27, 2010 6:15 pm
Posts: 3603
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For most earthlings it matters not.
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ketron281989
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Post subject: Re: Question on a 6SN7GT & GTA tube Posted: May Sat 12, 2012 2:32 pm |
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Joined: Jul Mon 11, 2011 9:04 pm
Posts: 412
Location: De Queen, AR
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Ok thanks guys, much appreciative for you help.
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BigBandsMan
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Post subject: Re: Question on a 6SN7GT & GTA tube Posted: May Sat 12, 2012 2:34 pm |
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 6037
Location: Raleigh NC USA
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Glad to oblige. Larry
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It don't make a go if it ain't got that GLOW!
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Burnt Fingers
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Post subject: Re: Question on a 6SN7GT & GTA tube Posted: May Sat 12, 2012 3:28 pm |
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Joined: Oct Sat 20, 2007 3:36 am
Posts: 13596
Location: New Hampshire
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Since those other uses make up a miniscule percentage in this century I alloted them .56% Audiophools are another breed and not discussed in polite society  Carl
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35Z5
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Post subject: Re: Question on a 6SN7GT & GTA tube Posted: May Sat 12, 2012 4:33 pm |
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 8656
Location: Chesapeake VA
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Aren't the only good sounding 6SN7GT the ones that are also(or) typed VT-231??  Tom
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Norm Leal
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Post subject: Re: Question on a 6SN7GT & GTA tube Posted: May Sat 12, 2012 4:43 pm |
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 28969
Location: Livermore, CA
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Must be, they are ones which bring the most money.
Actually 6SN7 was seldom used in radio. Very popular as horizontal osc, vertical osc, output and sync stages in 1940's & 1950's TV.
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Norm
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BigBandsMan
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Post subject: Re: Question on a 6SN7GT & GTA tube Posted: May Sat 12, 2012 5:32 pm |
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 6037
Location: Raleigh NC USA
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The best-sounding 6SN7s are the ones with round plates. In those, all the sound can arrive at the plate at the same time. With boxy or oblong plates, some of the sound gets there late and makes things rather mucky. Transit time, y'know..... 
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It don't make a go if it ain't got that GLOW!
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BigBandsMan
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Post subject: Re: Question on a 6SN7GT & GTA tube Posted: May Sat 12, 2012 5:35 pm |
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 6037
Location: Raleigh NC USA
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Burnt Fingers wrote: Since those other uses make up a miniscule percentage in this century I alloted them .56% Audiophools are another breed and not discussed in polite society Carl Touché!! Larry
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It don't make a go if it ain't got that GLOW!
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codefox
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Post subject: Re: Question on a 6SN7GT & GTA tube Posted: May Sat 12, 2012 9:46 pm |
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Joined: Nov Sat 27, 2010 6:15 pm
Posts: 3603
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Havbe you forgotten the snub nose offset plate chrome top Sylvanias? least microphonic.
Just kidding, but the button base RCA 1970s versions were really the worst crap ever.
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