SVT patching channel 1 & 2 question.

Discussion in 'Amps and Cabs [BG]' started by Ringhammer, May 30, 2020.

  1. Ringhammer

    Ringhammer Supporting Member

    Sep 3, 2016
    S. F. Bay Area
    In the following examples, what can I expect from each channel?




    I have always used the first example but I am finding that I want maybe leas brightness. I haven’t tried the second two examples yet (we’re recording vocal and guitar tonight so I’m bored). I typically use channel one to dial in most of what I want tone wise, and channel two to dial in some extra low-mids.

    Most importantly, none of these patches will hurt anything in the amp will they?
  2. Wasnex


    Dec 25, 2011
    I believe the options you show will get progressively less bright from top to bottom.

    The bright jack has a 100K resistor bypassed with a small capacitor. The capacitor let's more highs through. Anytime a signal passes through the bright jack, I believe it will accentuate the highs regardless of whether the signal is going into the jack or coming out of it, but the rate of accentuation will vary depending upon how you patch the amp

    This is partly because the input impedance of the channels changes depending upon whether you are plugged into the bright or normal input. The input impedance is 5.6meg ohms when you plug into the normal input of one channel and 47k ohms when you only plug into the bright input. The reason this occurs is because the Normal input jack has a shorting plug connected to a 47k resistor. If you plug into only the Normal input the short is lifted and the input impedance rises to 5.6meg.

    I believe this change in input impedance will have a significant impact on the RC time constant on the treble bypass capacitor when the Bright input is used as an output to bridge the two channels. I.E. I don't think it will accentuate the highs very much if you plug from the Bright out on channel 1 to the Normal in channel 2.

    Also plugging just into the channel 1 Bright input should be brighter than plugging into the channel 1 Bright input and looping through to channel two. This is also because when you plug into the Normal input it changes the impedance and RC time constant of the circuit. Also the input impedance of channel 1 will depend somewhat on which input you use on channel 2.

    I am not 100% certain on any of this as I am not an engineer and it has been a long time since I was a technician. The best thing to do is try the different combinations out and use the one that sounds best to you.

    There is one more option to consider as well.
    Ringhammer likes this.
  3. beans-on-toast


    Aug 7, 2008
    Patching the input won’t hurt the amp in any way. Experiment, listen for any changes in the high end harmonics. Combining the two tone stages provides you with more tonal complexity. Combining that with the different input configurations give you a lot of options. Use whatever inspires you to play better. That’s the important point.

    When it comes to recording, they can change everything in the mix. Your tone will tweaked all through the mixing process. Maybe they’ll undo some of what you are doing by dialing in the amp. High passing (removing some low end frequencies) can make the bass more prominent in the mix, a good thing. It’s about energy management of the tracks. At the same time, they might mix to change the mids and high end in your tone. Everything in the sonic landscape has to mesh well together for clarity and lack of a muddy sound. If possible, make sure you like how your contribution sounds in the final mix.
    Ringhammer and Wasnex like this.