Are 6AQ5-A and 6v6 tubes the same thing?

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by 6789, Dec 10, 2005.


  1. 6789

    6789 Member

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    I'm thinking of getting a 1970s Fender Musicmaster Bass amp (small 12 watt amp) and I'm finding some are listed as using 6AQ5-A power tubes and some use 6v6 tubes. Are they interchangeable without modifications to the amp?
     
  2. VacuumVoodoo

    VacuumVoodoo Member

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    nope. 6AQ5 is 7-pin, 6V6 is 8-pin besides differences in electrical parameters.
     
  3. 6789

    6789 Member

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    thanks for the info.
     
  4. Reeek

    Reeek Member

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    But 6AQ5's were "supposed" to be a small bottle tube that was designed for a 6V6 type tone.
     
  5. VacuumVoodoo

    VacuumVoodoo Member

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    Well, both tubes were originally designed for two specific applications in TV sets: vertical deflection amplifier and audio output amp. Since they were designed for same target application they have similar characteristics.
    However, the question was: "Are they interchangeable without modifications to the amp?" and the answer is "no" because you would at least have to replace tube sockets".
     
  6. samwheat

    samwheat Member

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    6AQ5A's have max 300 plate voltage. 5000 ohm impedance OT on SE.

    I have a Univox U45 from '65. I rebuilt it and added some distortion. It has a nice chime to it but you have to play it all out for it to sound good. Ain't that true of all amps!
     
  7. Reeek

    Reeek Member

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    I was just commenting. That's all.
     
  8. drbob1

    drbob1 Silver Supporting Member

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    OTOH they are stupid cheap for great tubes (I sold a pair of NOS Amperex on Ebay for $15 IIRC).
     
  9. hasserl

    hasserl Member

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    GET THE AMP!!!!! Don't screw around and miss it!!

    These are great little amps. Swap out the POS stock speaker for a Weber Signature 12 alnico, and you'll have an outstanding little amp. It's unbelievable how good these little amps sound.
     
  10. 6789

    6789 Member

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    A lot of people use this amp for guitar. I'm planning on using it for recording bass. will the Weber Signature 12 alnico be a good bass guitar speaker? or do you have other suggestions?
    thanks
     
  11. hasserl

    hasserl Member

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    I used to use mine for bass work for recording too. I stuck a Carvin PS12 speaker in it and it did a decent job. Then Weber had a sale on their Signature 12's so I picked one up and stuck it in the MM Bass and plugged in my guitar and I'll never think about using it for bass again. If I need a bass rig bad enough I would pick up anything else, but I wouldn't let go of this combo. It is that good.

    But back to your question, I wouldn't run a bass guitar thru that amp with the Signature 12. It might be okay a low volume, but I would think a lot of bass guitar frequencies could stress that speaker.
     
  12. VintageJon

    VintageJon Member

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    I'd ask Ted. He is very honest and responsive...

    (Sorry for the email overload Ted! I get it so you may as well have it...)

    -Jon
     
  13. VintageJon

    VintageJon Member

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    OH, ment to mention- the 6AQ5 is a great tube IF YOU CAN FIND A MATCHED PAIR!

    Love the XFMR Phase Inverter in this amp- Very McIntosh like...

    Would suggest EL84/6BQ5 replacement WITH REWIRING/REBIAS rather than re-punch for octal 6V6 socket. (It's gonna be problematic/expensive to repunch the holes..)

    -Jon
     
  14. Matt H

    Matt H Guest


    chances are you'll have to repunch to fit a 9 pin socket in there. most of the 7pin mini sockets i've seen are 5/8", whereas the novals are 3/4"... or did fender use oversized 7 pin sockets? (if so, that's awesome).

    regardless- you'd still have to replace the tube sockets..
     

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