Looking for SUPER SUPER CLEAN mods for Fender Super Reverb

Discussion in 'Amp Tech Center' started by Diverted, Oct 2, 2019.

  1. Diverted

    Diverted Tele-Meister

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    HI all,

    A friend of mine wants me to build him something like a Super Reverb, which is a very very clean amp. However he said he's played SRs before and while he likes them even those, he said, don't stay clean enough for him. He plays full out, and is looking for something that will stay clean even under heavy attack, dimed.
    So, what mods could I do to a stock SR circuit to accomplish this? More negative feedback? Smaller coupling caps? Etc?
    Would love to hear any and all suggestions you all have.
    I'll probably build it (if I build it) with a pair of 10s or a single 12, only due to the fact that he wants it somewhat light (he's getting on).
    Thanks.

    https://schematicheaven.net/fenderamps/super_reverb_ab763_schem.pdf
     
  2. schmee

    schmee Poster Extraordinaire Silver Supporter

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    There are people mo betta to help you, but I would suggest this:
    -If he wants a lot cleaner he wants a Twin Reverb.
    Short of that, for a Super Reverb enhancement:
    -Up the two 70uf filter caps to 100uf
    -Plug in SS rectifier.
    -Speakers, speaker, speakers... SR's have cheap light 20-25 watt speakers in them, for most people with 4 x 10 it's great. But to stay nice and clean go with more robust speakers that dont break up. a 4 x JBL 10 Super is amazing. They used to make them. Today.. with 2 speakers...hmmm:
    - if you can find 2 EV Force 10's that would be amazing , but expensive and heavy.
    - Weber 10's like Cali's might work.
    - 2 Weber 10F150's would blow your ears off. or a 10F150T too in a mix. For LOUD this would be my choice. 50 watt, or 75 watt if he REALLY plays that loud..

    But really... he wants a Twin. and you MUST have loud, high wattage clean speakers.
     
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  3. Diverted

    Diverted Tele-Meister

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    Thanks, great suggestions. I'm definitely going solid state with this one; no tube socket, just diodes. Check.
    OK, up the two serialed 70s to 100, giving me 50uf at 900v or so. Check.
    Speakers: Still trying to figure this one out ... he wants to keep it somewhat manageable so four 10s might be tough (two 12s might be, also). I'll look around. Money's not as much an issue as manageability.

    Thanks for the tips, I'm looking forward to figuring this out.
     
  4. 63 vibroverb

    63 vibroverb Tele-Holic

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    - Efficient high headroom speakers
    - 7581a power tubes in place of the 6l6’s
    - Solid state rectifier
    - keeping the Mid knob down low
    - Use input 2

    That should help
     
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  5. Diverted

    Diverted Tele-Meister

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    Thanks. This will be a stripped down circuit, one channel, no tremolo, and a single input jack. KT66s are a good idea, I will go that route!


    Getting back to 12s... would anyone have a good recommendation for a single 12 (new production) that will stay clean? He would prefer a 12 over a pair of 10s but realizes it may not be the best option. Thanks!
     
    Last edited: Oct 2, 2019
  6. archetype

    archetype Fiend of Leo's

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    What about a => 1975 SFSR? The ultralinear transformers, circuit, and70 Watts should deliver the sound that's in his head.
     
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  7. Diverted

    Diverted Tele-Meister

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    That would do it, but he wants me to build from scratch for him and he wants to keep it on the smallest (possible) size. The iron that would require is going to probably put it out of his weight comfort zone. Looking for something in the range of 40-45w. Thanks!
     
  8. fasteddie42

    fasteddie42 Tele-Holic

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    I would consider building as a head.
     
  9. Wally

    Wally Telefied Ad Free Member

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    I would have to know what guitars and pickups he plays and how he has them set up. The signal starts there. A player using high output pickups close to the strings is going to have a hard time keeping an amp from overdriving. The input signal circuit should accommodate whatever that guitar is putting out....and his pick attack is a big part of the equation. In other words, I know people who can’t get a clean sound out of an unamplified acoustic guitar, so I would not even try to set up an amp much build an amp for such a player if they told me that the amp had to stay clean when dimed.
    If I were going to take on the project you are considering, the first stage of filter caps would be 2 x 220mfds. I would build two input jacks a la as in the AB763 channel...one has a 6db cut and that might be the one a clean player would want to use. I might suggest using a 5751 or even 12AY7 for the input stage and the second gain stage. +1 on keeping the kids under control.
    I like a negative feedback circuit that doesn’t neuter the amp as much as the BF NFB loops do. There is a large area between the BF thing and no NFB at all....and just a bit more resistance there from the stock equation yields a clean yet lively signal.
    For my money, though, he and you might do better to simply find a Dual Showman Reverb and set it up for him. Or...how about a Super Twin Reverb? 180 watts. When someone wants clean, I think watts first. That way, one might not have to dime the thing! Eeeehaw.....
     
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  10. avspecialist

    avspecialist TDPRI Member

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    8C3FEC7F-BD03-4B1F-8EDA-E9F1E9F708C8.jpeg 676802E7-3E29-42E7-A74F-0CEBE4D426EE.jpeg 676802E7-3E29-42E7-A74F-0CEBE4D426EE.jpeg
    View attachment 643912 I have a 67 Super Reverb, stock, but changed some caps for maintenance. I have 2 Weber F150 and 2 Weber 10 inch alnico as advised by Webber. It now much louder than the original 4 X 10 ceramic Utah speakers that have been in there since 1969. Also the super reverb is much louder and cleaner now because the efficiency is much higher with the Weber’s. Don’t forget that a 3dB raise in speaker efficiency is like double the power. I made a 2X10 cabinet with a 5 inch opening in the back with 2 Weber California’ in it it is exceptionally good. If possible I would make the amp a head unit and separate speakers cabinet. It’s very easy to carry. I would build a single channel Rob Rob 6L6 style blackverb as a head unit.
     
    Last edited: Oct 3, 2019
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  11. MilwMark

    MilwMark Doctor of Teleocity Ad Free Member

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    Hint - It's not gonna sound like a Super Reverb.
     
  12. WireLine

    WireLine Tele-Afflicted

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    MusicMan HD130-410 gets real close, and your ears will bleed before it starts breaking up
     
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  13. schmee

    schmee Poster Extraordinaire Silver Supporter

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    True, 4 x 10 makes a Super, otherwise it's very like most Fender tube amps.
     
  14. rolandson

    rolandson Tele-Holic Silver Supporter

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  15. joeford

    joeford Friend of Leo's

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    check out the eminence em12n. 200 watts, 99.9dB efficiency, and neo so weighs in at <7lbs. killer speaker for loud cleans in a light package
     
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  16. muchxs

    muchxs Doctor of Teleocity

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    Eminence Cajun, Eminence Copperhead. Done!

    They're both 75 watt speakers.

    I have a Cajun in my test / reference cabinet. I ran various cranked 100 watt and 135 watt Twins through it on various occasions. Not surprisingly it's loud as hell. Surprisingly it handles it.

    The real fun one is a big amp into an Eminence 820H. Cone flaps a bit.



    Smallest possible size would be a Princeton Reverb chassis. If Randall Smith did it... we can, too!

    :cool: :cool: :cool:

    Use Allen Amps transformers. You want a TP25 and a TO26.

    If you have a "mine is bigger than yours is" mindset you might be put off by the relatively small size of the TO26. It's about the same size as a Pro Reverb or a Bandmaster transformer. I've never had any difficulty getting a loud clean tone from it.

    BTW the difference between 30 watts and 40 watts is negligible.

    No global NFB. Use local NFB.

    Trick is to set your benchmark beyond your usual expectations.

    A small amp that can be stacked as the need arises is more useful than a large combo.
     
    Last edited: Oct 3, 2019
  17. schmee

    schmee Poster Extraordinaire Silver Supporter

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    I've done Super Reverb trannies in a PR chassis. It's great. Trannies make a huge difference, if he wants CLEAN, the bigger the better as far as tranny's.
     
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  18. muchxs

    muchxs Doctor of Teleocity

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    Buddy of mine used to get custom transformers from a semi- local coil winder. Dude's shop burned to the ground. He rebuilt it. It burned again. He quit after the second burnout.

    Anyway, he'd wind Triad bootleg Leslie transformers for my buddy. Trick is to use a 251 PT in a 122. It's oversized. Even so, the old coil winder would laugh and point a the transformers I use. He'd say, "That's twice as big as you need!" and point. He continued, "You'll go broke using those."
     
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  19. MilwMark

    MilwMark Doctor of Teleocity Ad Free Member

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    Maybe I posted in proximity to something else. My point is that a super clean Super is no longer a Super, in my view.
     
  20. muchxs

    muchxs Doctor of Teleocity

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    So what is super clean? A Twin?

    Fender didn't intend any of these to distort.

    Maybe I've spent too much time at a mixing console. I don't view amps as amps anymore. Even something like a tweed Champ has faders and parametric EQ as far as I'm concerned. That's cuz I get under the hood and make it do what I want it to do.
     
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