6SN7 tubes that are gray glass

Tomasito
Tomasito Posts: 142
edited February 2010 in Electronics
I saw some 6SN7 tubes that are gray glass, instead of having a clear glass.
what are these tubes?
Having gray glass, one doesn't see if the tubes glow.
Post edited by Tomasito on
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  • george daniel
    george daniel Posts: 12,096
    edited February 2010
    They are an early version, highly sought after in some circles,, here is somethinghttp://www.6sn7.com/



    http://www.6sn7.com/
    JC approves....he told me so. (F-1 nut)
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  • Tomasito
    Tomasito Posts: 142
    edited February 2010
    thank you for the info
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  • ben62670
    ben62670 Posts: 15,969
    edited February 2010
    Jerryj12 has a bunch of the 6sn7's
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben
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  • heiney9
    heiney9 Posts: 25,249
    edited February 2010
    george daniel wrote: »
    They are an early version, highly sought after in some circles,, here is somethinghttp://www.6sn7.com/



    http://www.6sn7.com/

    Yep, Gray glass are very sought after but the 5692 might even be better and just as sought after.

    The gray coating was put on many 50's large signal and power tubes tubes to reduce stray emissions in tube equipment.

    I have RCA 6V6GT's with gray glass and I think for a 6V6Gt they are the best sounding except for the Bendix 5992.

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Puritan Audio PSM136 Pwr Condtioner & Classic PC's | Legend L600 | BlueSound Node3 - Tubes add soul!
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  • Tomasito
    Tomasito Posts: 142
    edited February 2010
    can I see the tube glow with the gray glass?
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  • heiney9
    heiney9 Posts: 25,249
    edited February 2010
    Tomasito wrote: »
    can I see the tube glow with the gray glass?

    Yes, but it tends to be very diffused. Depends on the how thick the coating is. I was thinking the same thing about my RCA 6V6's but after hearing them I don't care, they are fantastic!! I can see them glow, but not like a clear tube.

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Puritan Audio PSM136 Pwr Condtioner & Classic PC's | Legend L600 | BlueSound Node3 - Tubes add soul!
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  • Tomasito
    Tomasito Posts: 142
    edited February 2010
    OK I'll try the gray glass tube
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