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6G3 Bright Channel Hiss?

Discussion in 'Amp Tech Center' started by Uncle Daddy, Feb 26, 2021.

  1. Feb 26, 2021 #1
    Uncle Daddy

    Uncle Daddy Tele-Afflicted

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    On the back of a recent post where we spoke about a 0.003uF bypass cap on V1 plate load resistor to tame the brightness on the normal channel, could I use something similar on the other 220k resistor to cut a bit of tube hiss on the Bright channel? What would be the lowest value I could go to without impacting the tone too much?

    On my build the Normal channel has zero hiss when I dime the tone pot, but it's a bit intrusive on the Bright Channel. Not much, but more than my Princeton Reverb. I'm using metal film resistors throughout, and a 7025 in V1, and understand that tube hiss is inevitable at volume.

    Thanks

    6g3 cap.JPG
     
  2. Feb 26, 2021 #2
    Jon Snell

    Jon Snell Tele-Holic

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    Capacitor value is a matter of choice.
    Personally I would select a valve with less hiss.
     
  3. Feb 26, 2021 #3
    NTC

    NTC Tele-Holic

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    i.e. a lower value...
     
  4. Feb 26, 2021 #4
    Wally

    Wally Telefied Ad Free Member

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    I am not trying to be glib, but I would simply not dime the tone control. The mint 6g3 Deluxe I owned needed nothing changed in it, imho.
     
    D'tar likes this.
  5. Feb 28, 2021 #5
    cobaltu

    cobaltu Tele-Meister

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    I'm with Wally. Cranking the tone control will add a bunch of hiss almost no matter what. Besides, most of the hiss you're hearing is in the guitar's presence range (upper mids[2-5KHz]). Using a snubber cap would simply cut either very high frequencies and you would still hear hiss; or, it would start cutting valuable presence frequencies for the guitar. In which case, you wouldn't need to crank the tone control to begin with. Either way it's a case of "over EQ-ing". Also, you clearly wouldn't like this tone very much, otherwise you would just use the normal channel.

    A better way to address this might be from the other direction - cut bass instead.
    This would make your overall sound brighter, but without adding a ton of hiss. Try taking the bright channel's 0.022uF coupling cap down to ~0.0047uF.
     
  6. Feb 28, 2021 #6
    Jakeboy

    Jakeboy Tele-Afflicted

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    I found my 6g3 clone sounded best with the tone knob dimed. That is not an overly bright circuit. I do not remember if it hissed. All tube amps make some noise. I do remember it rocked though. Nastiest amp Fender ever made IMO.
     
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