Guitar amp circuit revision

Now, this might sound strange…:
Even when you’re developing a software guitar amplifier, you still have to get to know the beast yourself! Our model has gotten pretty complex and so close to the real deal that we have to play with it for longer than initially thought. Otherwise you’re tempted to stick to first-sight impressions and perhaps go on into false directions.

So we’ve done even more intensive listening tests at the beginning of January, after an ear-recalibrating Christmas break. This immediately led to some changes under the hood of VANDAL’s guitar amp:

<em>"Okay, this thing is the bomb for shred and such... <br>but I noticed the lead channel could be more up-front, you know..."</em>

"Okay, this thing is the bomb for shred and such... but listen, the lead channel must be more up-front, you know..."

First change was to filter out more of the low end, at least on the ‘classic’ and ‘british’ preamp models. This was done by enlarging the virtual inter-stage decoupling capacitors successively, so that the crunch & lead channels sound less muddy now.
While the cathode bypass cap values were changed too, re-adjusting the bias with each of the tube stages was also necessary. So the overall distortion timbre has changed slightly as well. I’d definitely say things improved (although we’re still testing here to find out).

With previous versions of the guitar amp, pressing the ‘lead’ switch fired up an extra tube stage on either preamp model. This is still the case. However, we now also engage a 2nd/spare set of virtual caps in the tone stack circuit: the lead channel switch performs a shift of the eq’s cutoff frequencies to different values. As a result, the tone becomes more mid-oriented and cuts through more easily, which is obviously important when you’re playing solos.

As usual with passive tone stacks, the thing still remains highly interactive and dependent on the underlying preamp model. In a nutshell: we got more variety now, you can freely switch between channels or preamps and find out what suits a particular situation best.

Furthermore, a couple of internal tweaks on the power amp were made as well. This includes changing the virtual output transformer. We now got a slightly different tone in the high-mid / treble region, which – in conjunction with a change in negative feedback (class AB mode) – leads to a slight boost around 4k and sounds a bit more ‘focussed’ on the attacks than previously.

Of course we do continue listening… 😉


3 Responses to Guitar amp circuit revision

  1. resident21 says:

    Hi, can I be a beta tester for this great sim?

  2. angrymeister says:

    I’d love to beta test as well!

    I have Ableton Live 7.014 (and Live 6 LE and 5 Lite)and Audition 3 and Reaper (Latest Update) and a Toneport UX2 and UX8 with all POD addons so could make full comparisons for you. I like what youve described in terms of design and tone ideas as the fundamentals.

    If you’d like to hear my guitar work to hear if your wanting to vex your eardrums drop me a line.

    Kind Regards

  3. resident21 says:

    Oh I remember that I forgot to write my system after read the post ahead.

    I have: – Emu- 1212M sound card
    – Line 6 Toneport DI Gold unit
    – Sound Blaster Audigy 4
    – An Intel Core I7 system with 6GB RAM

    Software : – Sonar 8 Producer edition
    – Cubase AI 4
    – VSTHOST 1.45 freeware host for general usage
    – Revalver MK III
    – POD FARM
    – Gearbox
    – Amplitube Metal
    – Amplitube live
    – Some good VST plugins
    – Chance to test Overloud TH1 as demo for 14 days.
    – more than 2000 speaker impulse files 🙂
    – windows 7 beta 64 bit edition
    -windows vista 64 bit edition
    – windows XP 32 bit edition

    Also I am an electronics and telecommunication engineer. Not know analog electronics well but know digital electronics and some DSP.

    I am not a good guitar player but can help all the program bugs, compability test ..etc

    Also I could not find an email adress so I wrote here. There is no link to reach you 🙂 .

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