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5F2A But More Wattage?

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  • 5F2A But More Wattage?

    Hello Everyone.

    I have a 5F2A and the tone is truly amazing. I'd really like to capture this tone but in a louder amp that can be used in a live setting without being mic'd up, but also without adding any additional channels or tone circuitry. What would be necessary to recreate this circuit but instead of 5 watts, something like 25 or 40?

    Would it be as simple as a beefier output transformer, another power tube (2 6V6?), and a power transformer that can supply the extra current for the added tube?

    Thanks
    James

  • #2
    No it wouldn't. Unfortunately, tubes in SE only develop around a half of their potential output in that mode, so even 2x6V6 is only going to get you 10-12W of useable power. For 2x6V6 in Push-Pull, you will need to go fixed bias to get anything like 25W, 40W? You're going to need 4x6V6, or 2x6L6.

    6L6 usually benefit from a more complex tone stack than a tone pot, like on the 5F2A, because you need to shelve some low end...can be done with careful voicing though.

    What you are essentially describing though is a "Double Deluxe" pioneered by Victoria Amps - a 5E3 Deluxe preamp mated to a 4x6V6 cathode biased, PP, output...the 5F2A has a NFB loop, whereas the 5E3 does not, easily modded/reversed. The volume & tone pots will need to be rewired like a 6G3 Deluxe, because the 5F2A volume pots are wired differently to the 5E3. Double Deluxes are usually rated around 35W +/-...

    Or, if you have room for an extra output socket on the 5F2A, you can wire up a "line out" by running a 2.2K resistor from the hot speaker tab to a non-switching 1/4" socket hot tab, then bridge the hot & ground tabs of the line out socket with a 470ohm resistor if you have a 4W output, or a 270ohm resistor for an 8ohm output. The line out socket ground tab will need to be connected to the main speaker ground. Then feed the line out into a bigger amp or PA.

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    • #3
      Consider this: Angela Super Single-Ended 6V6 Guitar Amp Project

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      • #4
        There's a thread in the Theory and Design section on this subject. If you want to stick with 6V6s, it will take 5 to get 25 watts and 8 for 40 W. For transformers, you are most likely looking at custom wound units.
        WARNING! Musical Instrument amplifiers contain lethal voltages and can retain them even when unplugged. Refer service to qualified personnel.
        REMEMBER: Everybody knows that smokin' ain't allowed in school !

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        • #5
          See Southbay amps
          Southbay Ampworks Amp Specifications
          4 x parallel 6V6 with 2x12" speakers, as per their 'Major Crunch', should get you a gigworthy amp.
          If you get in touch, he may sell you the transformer set or even complete kit of parts.
          My band:- http://www.youtube.com/user/RedwingBand

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