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AD60/120VT/VTX/VTH series amp models & EQ placement

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AD60/120VT/VTX/VTH series amp models & EQ placement

Postby Voxman » 24 Dec 2005, 15:48

Whilst most of the amp models are self explanatory or can be deduced from the Valvetronix AD60/120 manual, some are less obvious. For those interested, here's an accurate list: -

16 amps in total are modelled in the 'full-featured' AD60/120VT/VTX/VTH range: -

AC15 - Channel 2 of a 1962 Vox AC15
AC15TB - 1990's Vox AC15TBX ('top boost' channel)
AC30 - Vox AC30 (normal channel)
AC30TB - Vox AC30 ('Top-boost' channel)
BLACK 2x12 - Fender 'Blackface' Twin Reverb (clean channel)
TWEED 1x12 - 1958 (Vox describe as 18w but this is more likely 15w) 'narrow panel' Fender Deluxe (NOTE: following an interesting post from JoeM and some digging around of my own, I'm now convinced this is the Deluxe & NOT (as described in the article below) the Princeton, due to the power rating, 2x6V6 valve complement in the power stage, & 1x12" speaker size!)
TWEED 4x10 - 1959 Fender 4x10 Bassman
UK BLUES - 1960's Marshall JTM45 head (high treble channel)
UK ’70s - 1969 Marshall 100w Plexi head (high treble channel)
UK ’80s - 1983 100w Marshall JCM800 head
UK 90's - 1990's 100w Marshall JCM900 head (lead channel)
UK MODERN - Marshall JCM2000 DSL100 head (Hi-gain channel)
RECTO - 150w Mesa Boogie Dual Rectifier (modern high gain channel)
US HIGAIN - 1991 100w Soldano SLO100 Head (hi-gain channel)
BOUTIQUE OD - Dumble Overdrive Special 100w head (overdrive channel)
BOUTIQUE CL - Dumble 100w head (clean channel)

In addition, the following extract (taken from a great article giving a technical review of the Valvetronix amps) outlines how the EQ has been set for each model: -

Amps Modelled, and Tone Stack Placement for each Amp Type

Amp Type
Actual amp modelled
Tone stack loc.
Power amp model

AC15
VOX AC15
pre
B

AC15TB
VOX AC15TB
pre
B

AC30
VOX AC30
pre
B

AC30TB
VOX AC30TB Top Boost
pre
B

UK BLUES
Marshall JTM-45
pre
B

UK '70S
Marshall Plexi
pre
V

UK '80S
Marshall JCM-800
post
V

UK '90S
Marshall JCM-900
post
V

UK MODERN
Marshall DSL-2000
post
V

RECTO
Mesa Boogie Dual Rectifier
post
V

US HIGAIN
Soldano
post
V

BOUTIQUE OD
Dumble Overdrive Special
pre
B

BOUTIQUE CL
Dumble other model
pre
B

BLACK 2x12
Fender Twin Reverb
pre
T

TWEED 1x12
Fender Princeton
pre
B

TWEED 4x10
Fender Bassman
pre
T


Key:

Tone stack loc. -- "pre" means the tone controls (Bass, Mid, and Treble) are before the "Gain" distortion, which is actually a pretty fully modelled amp distortion just like in a Line 6 POD or Tech 21 SansAmp. "post" means the tone controls are after the "Gain" distortion. Practically, a nickname for the "pre" configuration is "Blues", and for "post" is "Metal".

Power amp model -- when inject high white noise into FX Return, turn down Gain/Vol/Treb/Mid/Bass/Presence, turn Master to
Max, and rotate Amp Type knob while listening to headphones, there are only 3 distinct EQ curves audible. B means bass is prominent, T means treble is prominent, and V means both bass and treble are prominently present.

To determine whether the Tone controls are before or after the "Gain" distortion: turn the Gain control to about 75%. Turn Midrange to 50%. Crank Bass and cut Treble, then crank Treble and Cut bass -- if the distortion becomes crusty and then liquidy, without the heard treble or bass changing in volume, the tone controls are before "Gain" distortion. Also try turning down all 3 tone controls -- if the volume linearly decreases accordingly, the tone controls are after "Gain" distortion.

In other modelling amps, such as the Line6 Flextone, are the Tone controls ever placed before the amp distortion? Yes - the treble control is pre-dist on some Line6 models, giving you a 1-band EQ pre-dist and a 3-band EQ post-dist. The more extensive "pre" placement in the Valvetronix is part of what is good or at least realistic sounding in the Valvetronix design. A classic Boogie amp has more like a 4-band pre-dist EQ, and 5-band post-dist EQ.


The article can be found here:-

http://www.amptone.com/voxvalvetronix.htm#_Toc30733011

Rich :wink:
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