Tube reccommendations for a Super Reverb, please

Discussion in 'Amps and Cabs' started by pfrischmann, Feb 16, 2006.


  1. pfrischmann

    pfrischmann Member

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    Hi Guys,
    I'm now the proud owner of a '67 Super Reverb with alnico CTS speakers. It sounds GREAT!

    Some of the tubes need to be replaced as there is a rushing sound in the backround (Almost certainly a bad 12AX7).

    so,
    I'd like to get some suggestions as to

    1. the if money was no object tube choices
    2. The only current production choices
    3. where it may make sense to put in NOS stuff and where current stuff is fine.

    I figured this might be able to help most people with BF Fenders.

    Thanks in advance,
    Paul

    BTW,
    I really love this amp.
     
  2. sdgvintage

    sdgvintage Member

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    1. Mike at KCA NOS can give you some great tubes.
    2. JJ Preamp tubes and TAD Power tubes are my prefered choices for current production stuff.
    3. I might consider NOS preamp tubes, in v2, and v6. v1 if you plan on using the non reverb channel. Most people don't use the vibrato, so its not advantageous to use a NOS in v5. v3 and v4 are your reverb section, NOS 12at7's are a dime a dozen so put a NOS one in v3 too.

    NOS power tubes can be very expensive, but sound great. NOS preamp tubes will last a very long time and are worth paying more for.
     
  3. fjs1962

    fjs1962 Silver Supporting Member

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    You didn't mention is the filter caps have been changed or not, but if they haven't I'd have that done as soon as you can too. On an amp that old they will eventually blow otherwise, possibly taking out other components when they do.
     
  4. pfrischmann

    pfrischmann Member

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    Thanks for the thought. The Electrolytics were all changed but he kept the 2 prong chord which is a bit weird.
     
  5. poutserman

    poutserman Member

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    This may be my own personal voodoo,but to me it makes no sense to mix NOS and current production tubes.Either,or.For an old super you cant beat RCA tubes.I have all RCA's in the preamp and RCA black plate 6l6's on my super and it kills.
     
  6. mad dog

    mad dog Silver Supporting Member

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    Paul: Smart amp choice there. I just sold my '67, only 'cause I rarely played. Those CTS speakers in that amp are a wonderful combination. Mine ran nicely with all NOS tubes, 5881 instead of 6L6. My amp tech suggested the 5881, to get a little more drive at a lower volume. It softened the sound just a touch. Subtle. Sounded right to me, so I never messed with tubes again.
     
  7. pfrischmann

    pfrischmann Member

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    If you were to consider NOS......Would they be telefunkin/Mullard or will JAN stuff be fine for this circuit?
     
  8. pfrischmann

    pfrischmann Member

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    What I'm aiming for is price vs performance and how much these BF style amps will benefit from the NOS stuff.....and at what level. After all. All Telefunkin preamps and black plate 6l6's could set me back almost $1,000. I'm not sure there would be that much of a difference between these premium tubes and the new stuff, or would there.....or are there strategic places that it would be worth it to put in the expensive stuff (and what would that be) and other places where it won't really matter.


    SDG Vintage kinda covered alot of what each tube does (v1, v2 etc...)
     
  9. myles111

    myles111 Member

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  10. sdgvintage

    sdgvintage Member

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    I would immediately get a 3 prong cord on ASAP, don't worry bout the tubes until you do that.

    As for what brand, each has its own sound so its hard to say which one to get. I will say as a general rule RCA's or GE's are good values and you could tube the whole amp with them vs one or two telefunkens.
     
  11. poutserman

    poutserman Member

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    When i tubed my Super it cost maybe 250 bucks.I don't think Telefunkens will sound good on a super at all.I think as a general rule that it makes sense to tube an american amp with american tubes and European amps with european tubes.Remember,Rca's were stock in Fenders and Mullard or Telefunken in Marshalls.:cool:
     
  12. myles111

    myles111 Member

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    I personally agree with the non-use recommendation of a long smooth plate telefunken in a Fender Super Reverb. Way too bright for my tastes.
     
  13. Lord Valve

    Lord Valve Active Member

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    I'm Derek Trucks' amp tech. Here's what I run in
    his '65 and '66 BFSRs:

    Looking at the amp from the REAR, numbering the
    sockets from RIGHT to LEFT:

    1) We leave this one empty. This gives a small
    but not insignificant boost to the Vibrato
    channel, which is the one Derek uses.

    2) On the '65, it's an NOS Beijing-production
    "Silver Special" 12AX7; on the '66, it's
    currently a Reflektor/Tung-Sol 12AX7. We
    experimented with the current-production
    Chinese 12AX7 (variously referred to as
    a C-4 or a C-9, for some unfathomable
    reason) as well as the current "Silver
    Special" from Ruby. Both sounded like
    ass; the Tung-Sol *kicked* ass, so it
    stayed in.

    3) NOS Philips JAN 12AT7WC. Many 12AT7s,
    including NOS, will die an early death here.
    (Especially in the SF amps, which have a
    low-value cathode resistor that burns the
    crap out of the reverb driver tube.) The
    Philips sounds good and doesn't croak.

    4) On the '65, another NOS Beijing 12AX7,
    this time, the gray-plate version.
    On the '66, another Reflektor/Tung-Sol.

    5) Any 12AX7 that still lights up. (Derek doesn't
    use tremelo.) If you use it, you can still
    leave the old one in, as long as it's not
    shorted or otherwise wierd.

    6) On both amps, this is currently an NOS Mullard
    CV-4024/12AT7WA, and NO...IT ABSOLUTELY AIN'T
    "BALANCED." We don't need no steenking SNAKE
    OIL in Derek's amps.

    7) On the '65, NOS Philips JAN 7581A. On the '66,
    the Reflektor/Svetlana 6L6GC.

    8) See above.

    9) On the '65, an NOS Philips 5AR4. On the '66,
    a Sovtek GZ-34.

    Both of these amps sound *killer*. (Derek may have
    a bit to do with that, though.) The two amps I built
    for him to use with the Allman Brothers run similar
    tube sets. Nearly every BF/SF Fender that crosses
    my bench leaves the shop with the above tubes installed;
    customer satisfaction is very high.

    BTW - not mixing NOS and current production tubes is
    just plain silly. I figure if Stevie Wonder would
    like 'em, you probably will too. (Think about it.)
    Brand Snobs miss out on a lot of great tone by believing
    in myths like that.

    Lord Valve
    Expert
     
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  14. blackfacetom

    blackfacetom Member

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    What does it for me is the Mullard GZ34/5AR4 rectifier, get a NOS Double line shield if you can,(Great Britain). I have used Bugle Boys, Amperex, Telefunkens, Blackplates, and it is my experience as long as your power tube are balanced, and your pre-amps are good the Mullard GZ34 my just surprise you. Just my opinion, I have had people tell me that the rectifier only controls the voltage but it sounds sweet in my Super.
    Tommy
     
  15. sdgvintage

    sdgvintage Member

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    I once did up a vibroverb with a jensen p15n reissue, all JJ preamps, Sylvania NOS 6l6gc, Mullard GZ34 tall one, mercury magnetics transformers. Man oh man that amp sounded special. The only way I could describe it how it sounded when you played it, it made you feel like you were kissing a hot girl for the first time on a hot summer evening.
     
  16. pfrischmann

    pfrischmann Member

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    Wow Great Information!

    I've heard several people say that it's a mistake to under estimate the importance of a tube rectifier. Even though it's not directly in the audio path.

    This is getting really interesting.
     
  17. pfrischmann

    pfrischmann Member

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    Cool stuff as always LV. I thought it might be interesting to se what came with the amp sooo

    v1=Sovtek 12ax7wxt+ (98)
    v2=Raytheon 12at7 (I believe, very hard to read)
    v3=Sovtex 12Ax7WXT+ (98)
    v4=same
    v5=RCA 7025
    v6=Telefunken 12at7 (I think this may be the tube causing the niagra falls effect, unfortunately)
    v7= Sovtek 5881WXT
    V8=same
    V9=Mullard GZ-34 (made in Great Brittain)
     
  18. Lord Valve

    Lord Valve Active Member

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    v1=Sovtek 12ax7wxt+ (98)
    Gack! Chuck it!

    v2=Raytheon 12at7 (I believe, very hard to read)
    Belongs in #3. Move it.

    v3=Sovtex 12Ax7WXT+ (98)
    Belongs in the dumpster. Toss it!

    v4=same
    See above.

    v5=RCA 7025
    Put this one in #2.

    v6=Telefunken 12at7
    Worth keeping. Don't put it in the #3
    hole, though.

    (I think this may be the tube causing the niagra falls effect, unfortunately)
    Not likely. Pull the #1 and #2 tubes (just put the
    amp on standby, you don't have to turn it all the way
    off) and see if the noise stops. If not, pull #4.
    If you still have noise, pull #6.

    v7= Sovtek 5881WXT
    V8=same
    Certainly not my favorite, but yours is one of
    the few amps this tube can sound good in. I'd
    go with a pair of the Reflektor/Svetlanas or
    some of the Shuguang tall-bottle blackplate
    6L6s, though.

    V9=Mullard GZ-34 (made in Great Brittain)
    This one's a keeper.

    Lord Valve
    Expert
     
  19. pfrischmann

    pfrischmann Member

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    Thanks again for the tip.

    thought you guys would find this interesting. I checked out the tubes that were installed with in my amp with my handy b&K tester. It's not a transconductance tester or anything cool like that but it's pretty good at telling if a tool is good or bad.

    The Tele ecc81 has one side that is pretty dead, unfortunately. One side tests really great.


    Here's the weird thing.......All of the Sovtek 12ax7 wxt's test bad. The heaters don't even light up.

    I've noticed this with other sovtek tubes.

    What gives?
     
  20. Blue Strat

    Blue Strat Member

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    I remember even the "good" WXTs testing WAY lower than any other 12AX7 I've ever seen. Possibly the worst 12AX7 ever made.
     

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