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Thread: The 6SL7GT valve & It's variants - MY ADVENTURES!

  1. #1
    Join Date: Nov 2010

    Location: Yorkshire

    Posts: 7,181
    I'm AnDreW.

    Default The 6SL7GT valve & It's variants - MY ADVENTURES!

    Part 1 - Intro!

    This year I decided to properly get into tube rolling on the Croft pre-amp.

    I decided to embark on some adventures with the 6SL7GT so far I have tried the following

    Mullard 6SL7GT - UK
    RCA black base 6SL7GT (AMERICAN)
    Reflector 6H9C (Russian) - Non military version
    Slyvania black base 6SL7GT - USA

    On order

    MELZ 6H9C Metallica base
    MELZ 6H9C Black base

    Currently trying to do a deal on some General Electric (USA) 6SL7GT'S

    I'll post some pics and findings as I get time.


    So my first valve. The Reflector 6H9C (NON MILITARY version)

    Reflector 6SL7 69HC with box 01.JPG

    This is not my image. My camera's battery was exhausted. These can be purchased very cheaply from Russia or Watford valves if you don't want the hassle of e$cum. I would heartily recommend trying this valve out purely for so you get some idea of how the valve can be bettered. It's only when you hear a so-so valve do you then start to appreciate just how good things can be. It's an inoffensive valve which is pretty much middle of the road. It's not very detailed when compared to the Sylvania's and Mullard's of this world but for a cheap starter it's perfectly ok. I'd probably keep a set of this in my box as spares when testing out new amp purchases when I dont want to put additional hours of some of my rarer valves. It's not particularly good at soundstage depth or instrument separation and timbral detail is severely lacking. This valve is magical in being a benchmark of how crapiness (sic). But, as stated if you learn it's weaknesses you can then appreciate a really good valve.

    STAY TOOBED!
    SS CD Teac VRDS25X(Audiotuned) DAC Caiman SEG+15V PSU DECK 1210 Mat Analog Studio Crystal Mods MN Base/Bearing/Platter+Ebony arm Board Feet Isonoe PSU Paul Hynes SR7EHD-27XL/DCSXL Ag DC lead/Jaeger(low-impedance) connector/3 StageRegs/Recapped PCB+No Pitch/Strobe/Light ARM SME V(Kondo Ag Rewire&Tags) MC Cadenza Black CABLES Arm Yannis SPD-4 IC Yannis 222 Litz+Ag bullets Power WAR PRE ATC SCA2 SPEAKERS ATC 50ASL STANDS Atacama PHONO Sugden Masterclass PA4 SUT Ortofon ST80SE POWER PSAudio P10

    Valve PRECroft Epoch(Mega Modded) AMP Sondex S100 SPEAKERS Tannoy 15"MG+RFC Warwick cabs+ Reference XO DECK Garrard301 Mat Teunto Bearing 401 Plinth Moldovan Arms 3009/3012(Ikeda Ag wired) PSU No9 MCAg Meister SPU CABLES Arm Yannis 420.5 Litz+ SpeakerVdH 6mm Blue IC Oyaide FTVS-510 AgWBT 0110Ag Phonostage Paradise/EAR 3009 Clone (Telefunken)


  2. #2
    Join Date: Nov 2011

    Location: Manchester, UK

    Posts: 181
    I'm Simon.

    Default

    my favourite 6SL7 are the Sylvania 6SL7WGT brown base



    best of luck
    Simon
    SJS Arcadia Line Level Pre-amplifiers, Headphone amps, MM Phono Stages and SET Power amps - service, repairs, upgrades

  3. #3
    Join Date: Nov 2010

    Location: Yorkshire

    Posts: 7,181
    I'm AnDreW.

    Default

    Simon,

    Thanks for replying. I've seen these over on ebay.com and they are getting more expensive as each month goes by! I'll be dipping my toes into the Russian variants at the end of this month. I have some Melz coming. I'm listening to to Sylvania black base 6SL7GT's at the moment and so far they have been excellent. Prior to those I had some Mullard's in which were simply sublime. The Sylvania's are stopping in until the Melz turn up and then I'll write some words on my findings.

    Thanks

    A
    SS CD Teac VRDS25X(Audiotuned) DAC Caiman SEG+15V PSU DECK 1210 Mat Analog Studio Crystal Mods MN Base/Bearing/Platter+Ebony arm Board Feet Isonoe PSU Paul Hynes SR7EHD-27XL/DCSXL Ag DC lead/Jaeger(low-impedance) connector/3 StageRegs/Recapped PCB+No Pitch/Strobe/Light ARM SME V(Kondo Ag Rewire&Tags) MC Cadenza Black CABLES Arm Yannis SPD-4 IC Yannis 222 Litz+Ag bullets Power WAR PRE ATC SCA2 SPEAKERS ATC 50ASL STANDS Atacama PHONO Sugden Masterclass PA4 SUT Ortofon ST80SE POWER PSAudio P10

    Valve PRECroft Epoch(Mega Modded) AMP Sondex S100 SPEAKERS Tannoy 15"MG+RFC Warwick cabs+ Reference XO DECK Garrard301 Mat Teunto Bearing 401 Plinth Moldovan Arms 3009/3012(Ikeda Ag wired) PSU No9 MCAg Meister SPU CABLES Arm Yannis 420.5 Litz+ SpeakerVdH 6mm Blue IC Oyaide FTVS-510 AgWBT 0110Ag Phonostage Paradise/EAR 3009 Clone (Telefunken)


  4. #4
    Join Date: Nov 2010

    Location: Yorkshire

    Posts: 7,181
    I'm AnDreW.

    Default

    Hmmmmm not liking the Slyvania black base 6SL7GT as much as the Mullards. More details tomorrow when I plonk the Mullards back in for comparison.
    SS CD Teac VRDS25X(Audiotuned) DAC Caiman SEG+15V PSU DECK 1210 Mat Analog Studio Crystal Mods MN Base/Bearing/Platter+Ebony arm Board Feet Isonoe PSU Paul Hynes SR7EHD-27XL/DCSXL Ag DC lead/Jaeger(low-impedance) connector/3 StageRegs/Recapped PCB+No Pitch/Strobe/Light ARM SME V(Kondo Ag Rewire&Tags) MC Cadenza Black CABLES Arm Yannis SPD-4 IC Yannis 222 Litz+Ag bullets Power WAR PRE ATC SCA2 SPEAKERS ATC 50ASL STANDS Atacama PHONO Sugden Masterclass PA4 SUT Ortofon ST80SE POWER PSAudio P10

    Valve PRECroft Epoch(Mega Modded) AMP Sondex S100 SPEAKERS Tannoy 15"MG+RFC Warwick cabs+ Reference XO DECK Garrard301 Mat Teunto Bearing 401 Plinth Moldovan Arms 3009/3012(Ikeda Ag wired) PSU No9 MCAg Meister SPU CABLES Arm Yannis 420.5 Litz+ SpeakerVdH 6mm Blue IC Oyaide FTVS-510 AgWBT 0110Ag Phonostage Paradise/EAR 3009 Clone (Telefunken)


  5. #5
    Join Date: Nov 2010

    Location: Yorkshire

    Posts: 7,181
    I'm AnDreW.

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    Pt II - Slyvania Black Base 6SL7GT

    WOW, what a valve. Very very detailed. A massive improvement over the Sovtek 6H9C valve. The soundstage is very cohesive in fact it's the first thing that strikes you when you try them out. The Slyvania does loose out however to my Reference valve which is the Mullard 6SL7GT in that piano presentation is a little lacking in end note decay in that you can hear the note "wobble" as it decays. This is something that I don't get with the Mullards piano notes are sharp and crisp and have a very sharp leading edge. The Slyvania's have less end note decay and notes don't seem to "float" as well the Mullards. Percussion work on the Slyvania's is excellent but again the Mullards just seem to ace them again. I have to say that the Slyvania's are very very good at findings those little extra details in the background of live recordings. Cal Tjaders Session Live record being a good example. You can hear several members of the audience getting up out of seats whilst talking to each other and squeaking floor boards as they move around. All excellently rendered by the Slyvania's. All in all a very very good valve but I'm glad I have my Mullards back in. I'll give these a score of 7/10.

    DSCN3515.jpgDSCN3517.jpgDSCN3516.jpg

    For a little fun I've decided to have a 6SL7GT shoot out list, so here goes.

    1. Mullard 6SL7GT 9.25/10
    2. Slyvania 6SL7GT black base 7/10
    3. Reflektor black base 70's version 5/10
    SS CD Teac VRDS25X(Audiotuned) DAC Caiman SEG+15V PSU DECK 1210 Mat Analog Studio Crystal Mods MN Base/Bearing/Platter+Ebony arm Board Feet Isonoe PSU Paul Hynes SR7EHD-27XL/DCSXL Ag DC lead/Jaeger(low-impedance) connector/3 StageRegs/Recapped PCB+No Pitch/Strobe/Light ARM SME V(Kondo Ag Rewire&Tags) MC Cadenza Black CABLES Arm Yannis SPD-4 IC Yannis 222 Litz+Ag bullets Power WAR PRE ATC SCA2 SPEAKERS ATC 50ASL STANDS Atacama PHONO Sugden Masterclass PA4 SUT Ortofon ST80SE POWER PSAudio P10

    Valve PRECroft Epoch(Mega Modded) AMP Sondex S100 SPEAKERS Tannoy 15"MG+RFC Warwick cabs+ Reference XO DECK Garrard301 Mat Teunto Bearing 401 Plinth Moldovan Arms 3009/3012(Ikeda Ag wired) PSU No9 MCAg Meister SPU CABLES Arm Yannis 420.5 Litz+ SpeakerVdH 6mm Blue IC Oyaide FTVS-510 AgWBT 0110Ag Phonostage Paradise/EAR 3009 Clone (Telefunken)


  6. #6
    Join Date: Jan 2013

    Location: Birmingham

    Posts: 3,721
    I'm James.

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    Any chance Andy of a picture of the valves in situ in the Croft preamp?

  7. #7
    Join Date: Jan 2008

    Location: Wrexham, North Wales, UK

    Posts: 78,033
    I'm AudioAl'sArbiterForPISHANTO.

    Default

    Quote Originally Posted by sjs View Post
    my favourite 6SL7 are the Sylvania 6SL7WGT brown base



    best of luck
    Simon
    Hi Simon,

    I agree, but for best sound, it's got to be the 1950s vintage ones, which look like this:



    Those sound stunningly good!

    Marco.
    http://www.thestainedglasscompany.com

    "A man is a success if he gets up in the morning and gets to bed at night, and in between he does what he wants to do" -- Milan Kundera.

    BE HAPPY EVERYDAY!

  8. #8
    Join Date: Nov 2010

    Location: Yorkshire

    Posts: 7,181
    I'm AnDreW.

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    Quote Originally Posted by Jimbo View Post
    Any chance Andy of a picture of the valves in situ in the Croft preamp?
    Will see what I can do.
    SS CD Teac VRDS25X(Audiotuned) DAC Caiman SEG+15V PSU DECK 1210 Mat Analog Studio Crystal Mods MN Base/Bearing/Platter+Ebony arm Board Feet Isonoe PSU Paul Hynes SR7EHD-27XL/DCSXL Ag DC lead/Jaeger(low-impedance) connector/3 StageRegs/Recapped PCB+No Pitch/Strobe/Light ARM SME V(Kondo Ag Rewire&Tags) MC Cadenza Black CABLES Arm Yannis SPD-4 IC Yannis 222 Litz+Ag bullets Power WAR PRE ATC SCA2 SPEAKERS ATC 50ASL STANDS Atacama PHONO Sugden Masterclass PA4 SUT Ortofon ST80SE POWER PSAudio P10

    Valve PRECroft Epoch(Mega Modded) AMP Sondex S100 SPEAKERS Tannoy 15"MG+RFC Warwick cabs+ Reference XO DECK Garrard301 Mat Teunto Bearing 401 Plinth Moldovan Arms 3009/3012(Ikeda Ag wired) PSU No9 MCAg Meister SPU CABLES Arm Yannis 420.5 Litz+ SpeakerVdH 6mm Blue IC Oyaide FTVS-510 AgWBT 0110Ag Phonostage Paradise/EAR 3009 Clone (Telefunken)


  9. #9
    Join Date: Jan 2008

    Location: Wrexham, North Wales, UK

    Posts: 78,033
    I'm AudioAl'sArbiterForPISHANTO.

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    Interesting thread, Andy. As you know, I've been here many times before, but it's always fun to revisit these things again. Aside from the valves you've listed, I thought you also had some Mullard ECC35s, which I recommended to you last time?

    The 1950s 'Tall Boy' narrow brown-base versions are the ones you want.

    Those are probably the best (albeit also most expensive) 6SL7 types you can buy. Another beauty is the RCA 5691 red base, which is also a sonic stunner (huge, expansive sound, super-airy top-end, crystal clear mid, and massive, 'blow your tits off' bass!)

    Other 6SL7s I rate are: military spec Raytheon VT-229 (with smoked glass), the Russian Melz you mention, but they must be the ones with holes in the anodes, from the 1950s, and military spec Tung Sol 6SU7GTY (6SL7 equivalents), like these, from the 40s to early 50s:



    Awesome sound!

    Marco.
    http://www.thestainedglasscompany.com

    "A man is a success if he gets up in the morning and gets to bed at night, and in between he does what he wants to do" -- Milan Kundera.

    BE HAPPY EVERYDAY!

  10. #10
    Join Date: Nov 2011

    Location: Manchester, UK

    Posts: 181
    I'm Simon.

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    Quote Originally Posted by Marco View Post
    Hi Simon,

    I agree, but for best sound, it's got to be the 1950s vintage ones, which look like this:



    Those sound stunningly good!

    Marco.
    Marco

    Aren't they the same ones? ;-)

    There are some 6SN7s which look v similar and they are also v nice

    Simon

    Sent from my SM-G930F using Tapatalk
    SJS Arcadia Line Level Pre-amplifiers, Headphone amps, MM Phono Stages and SET Power amps - service, repairs, upgrades

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