Peavey Classic VTX Series User Manual

PREAMP SECTION ‘NOT ACTIVE WHEN NORMAL CHANNEL SELECTED POWER AMP/SPEAKER SECTION
SIGNAL FLOW BLOCK DIAGRAM
OOriED I IMIS INDiCATF <*>TION»l SIGNAL H OW PATH
SIGNAL FLOW
The signal flow chart indicates that the Classic® is basically a two-channel system (lead and normal channels) with two main
electronic sections (preamp and power amp). When signal is introduced through either the high or lowgain input jacks, it travels into the
preamp section where it is amplified and processed in both lead and normal channels. Inthelead channel, pull bright, SATURATION or
thick effects may be added to the signal, or they may be bypassed. Note that in the normal channel only the pull bright effect can be added
Siqnal from both channels enters the AUTOMIX 1 * channel switching circuitry which is controlled by a remote footswitch. If the lead
channel is selected, the signal from that channel ONLY enters the four-band equalization circuitry From there it travels through the post
gain control, other effects such as reverb and phaser. and then into the power amplifier. The power amplifier then delivers an amplified
signal to drive the Scorpion" loudspeaker.
You might wonder why it is so important to know about signal flow. Notice on the chart that the signal MUST flow through the
sections containing the EQ, phaser, and reverb. This tells you that these features are available on BOTH lead and normal channels Now,
notice that SATURATION" and thick are post (after) the lead channel pre gain and pre (before) the AUTOMIX These twofeatures may
only be operated through the lead channel
Please study the flow chart. Since each control interacts and therefore has an effect on other controls, a complete understanding of
signal flow will lead to maximum utilization of the Classic’s® advanced features and capabilities. We have also included several charts to
give you some basic control settings with which to begin. Slight modifications to these settings may be necessary to suit your own
individual tastes and performing requirements.
Following is an explanation of each control's purpose and operation. Experimentation with each control will aid in an overall
understanding of your new Classic®.
FRONT PANEL
INPUTS (A) (B)
The Classic® VTX provides two input jacks, each having different sensitivities and a unique arrangement allowing the gain of both
inputs to be equalized when instruments are plugged into Both jacks simultaneously.
The high gain jack (A) has considerably more sensitivity and input impedance than the low gain jack (B). and is the input normally
used with most nstruments, especially when maximum distortion and overdrive are desired.
The low gain jack exhibits approximately 6 dB less gain and is intended primarilyforuse with instruments which have extremely high
output pickups. “Hot” pickups will sometimes prematurely overload the high gam input jack causing an unpleasant tonality and harsh
overdrive characteristics.
You should experiment with both input jackstodetermine which will bestsuit yourown individual playing styieand your instrument’s
output characteristics.
The difference between the two jacks may be seen by plugging into the high gain jack and setting the gain of the amp to an
appropriate level. Now plug the instrument into the low gain jack, being sure to leave both amp and instrument gain at the same settings.
The overall system gain will now be lower and you will notice a decrease in volume.
LEAD CHANNEL
GAIN BLOCK "
The Classic® has been designed utilizing Peavey’s new GAIN BLOCK'" signal processing front end circuitry. The three interacting
controls provide total control of the amp’s gain structure (dynamics), harmonic content, overload texture, and output level.
Each of the three controls must be understood and experimented with in order to utilize the potential of this specialized circuitry.
Note in the SIGNAL FLOW BLOCK DIAGRAM where each of these controls falls into the flow pattern. The setting of each control will
interact and have an effect on the action of the other controls.
PRE GAIN/PULL BRIGHT (C)
The lead channel pre gain control is similar to a conventional volume control in that it is the first level setting device in the system.
Operation cf this control is conventional even though the associated circuitry is quite different from older, totally passive units. Please be
aware that this control exhibits the professional logarithmic (audio) taper, having approximatelycne-fourth of the gain achieved at the 12
o'clock position with the remainder being obtained as the control is rotated clockwise. This logarithmicaction significantly increases the
amount of "control latitude" available. Rotating the control clockwise increases the gain of the Classic s® preamp section and thus raises
the volume level of the system.
The pre gam control also features an integral pull switch which adds a significant boost (8dB) to thehigh frequencies when activated.
This high frequency boost gives a nice “edge” to clean playing styles. However, experience has proven that this high boost tends to
detract somewhat from the smooth overload characteristics when playing in the distortion moce. The pull bright switch should therefore
be in its off (pushed in) position when the smoothest distortion characteristics are desired.
SATURATION" (D)
This control Is the element for setting the operating point of our new (patent applied fer) end unique SATURATION'" circuitry.
SATURATION" is a very sophisticated circuit that synthesizes the action of vacuum tubes (valves) when they are overdriven, ine
SATURATION’" effect operates within the preamp section and exhibits more effect as the control is rotated clockwise.
The SATURATION" control must be balanced with appropriate settings of the pre and post gain controlstoobtain optimum results.
The pre qain control must be set high enough to provide adequate drive voltage to the SATURATION" circuitry whileThe SATURATION"
control is varied to achieve the desired overload characteristics. The post gain control is then set to achieve the desired output level and
harmonic texture.

Peavey Classic VTX Series Specifications

General

Brand	Peavey
Model	Classic VTX Series
Category	Amplifier
Language	English