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SOLD FS: Peavey Classic 400 (Local Only)

Discussion in 'For Sale: Amps, Preamps, and Cabinets' started by Jason!, Dec 7, 2013.

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  1. Jason!


    Nov 14, 2008
    GR, MI
    Up for sale is my Peavey Classic 400. I hate to do it but I'm not in a band and it's sitting unused. I'd rather pass it along to someone who's going to use this monster the way it should be used! I got it from a TB'er back in May after a LONG search for one.

    Here's some info from the previous owner:

    "About the mods -- most were done in collaboration with (or at the suggestion of) Bobby Baldwin, Peavey's chief bass amp designer.

    Bobby is on TalkBass and he is a GOLD MINE of info -- he was able to tell me all about the design and testing of the amp, and his recommendations and guesses have always been SPOT ON.

    First (and most significantly) the amp was retubed with JJ KT88's. Bobby recommended these because the original spec Chinese 6550 power tubes had an output impedance unlike typical 6550's and the output transformer was built to work with them -- so most 6550s really can't generate the full 400 watts. But this one...when I retubed and rebiased the amp, I measured a smooth 40v sine wave at 40 Hz into 4 ohms -- that means rated power at the fundamental frequency of a low E at 400 watts RMS.

    When I retubed, I also replaced the driver tube with a balanced and gain matched 12AT7 -- this ensures that the power tubes are being fed a symmetrical signal to get the most clean output possible.

    I've also done a lot of experimentation with the preamp tubes. What I've found is that the Clean channel is very bright, so I used a slightly "dark" sounding tube in V1 to tame it down a bit -- a JJ 12AX7 (ECC83S). I really like a Sovtek 12AX7LPS in V2 to smooth out the overdrive on the Crunch channel. For the rest of them, I used TungSols for low noise, reliability, and lack of microphonics.

    I added power tube retainers to the amp to keep those big KT88s in place. I attached the retainers with stainless steel screws and locknuts--secured with Loctite to ensure that they wouldn't get loose and drop into the chassis.

    The other MAJOR change I made to the amp was to make the bias adjustment accessible without having to remove the amp from the case. Considering that the chassis weighs 85 lbs, this makes the amp MUCH easier to service. When I moved the pot, I replaced it with a Bourns precision 10-turn potentiometer, so that you have a lot more control and fine tuning when you adjust the bias. It also tends to "drift" less.

    For my own preference, I installed a Neutrik Speakon jack -- they handle a lot more power than 1/4" jacks. The only downside is that you can't wire a Speakon to short the output, so you have to ensure that you turn the amp off (or at least to standby) whenever you switch cabs, but that's a good habit to get into regardless.

    Another recommendation from Bobby was to remove the cooling fan. He said that it just causes vibration that messes with the tube filaments, and it made a lot of noise. With the open front and back like mine has, the tubes get plenty of passive ventilation.

    The open front panel was another mod, and rather than the original "diamond pattern" grille, I had a custom one made that matched the back grille.

    To minimize vibration transferred from the speaker cab back into the amp, I replaced the "feet" with 6 oversized (like hockey pucks) feet.

    I also put rubber feet on the short edge of the amp by the power transformer, so if you need to (briefly) carry the amp like a suitcase, you can set it down without getting it dirty.

    There were a couple other minor mods that escape me, but those are the ones that most effect the tone of the amp.

    The retube cost about $350, and it shouldn't need another retube for years; the preamp tubes can last for decades, and the power tubes haven't seen that much use, and have been checked periodically to ensure that the bias hasn't drifted (it hasn't)."

    I'm super bummed to let this amp go but the music scene where I moved blows and I could use the cash. I'm in Fort Myers, Florida. I could drive an hour or so to meet a buyer. NO SHIPPING.

    I may consider partial trades for a newer lightly used PS3 or a PS4 at retail value.

  2. deputy42

    deputy42 Supporting Member

    Aug 23, 2011
    mechanicsburg, pa
    Very nice. Let me know if you decide to ship.
  3. Zootsuitbass


    Mar 13, 2011
  4. Put me next in line if you choose to ship
  5. PM'd
  6. groovaholic

    groovaholic The louder the better. Supporting Member

    Sep 19, 2004
    Grand Rapids, MI
    Speaking from experience -- you will miss this amp, and probably never come across another one.
    You will CERTAINLY never find another that was as obsessively tweaked and modded to perfection!

    Good luck with the sale -- if selling it is what you REALLY want to do...
  7. Jason!


    Nov 14, 2008
    GR, MI
    Hey John! I'll definitely miss this amp and not too stoked to sell it either but could use the cash and I hate to see it sitting unused. It's THE SVT killer, believe it.

    Oh and I'm not interested in trades, absolutely will NOT ship. I have a deal pending with LowendinFL.
  8. Unchain

    Unchain I've seen footage.

    Jun 20, 2005
    Tucson, AZ
    Oh dear god, how I wish I lived in Florida right now.

  9. christw

    christw Get low!

    May 11, 2008
    Dayton OH
    I want to be Tesla (tinkerer at Dayton Amp Co)
    I've wanted one of these for freaking ever. Ohio bump :(
  10. placeboe


    Aug 22, 2010
    Any local bites?
  11. Selta


    Feb 6, 2002
    Pacific Northwet
    Total fanboi of: Fractal Audio, AudiKinesis Cabs, Dingwall basses
    These are way cool amps. I regret selling mine.
  12. Jason!


    Nov 14, 2008
    GR, MI
    Yup, should be a done deal Saturday.

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