Bass Gear Issue 7 : Page 32Fig. C disassemble that I have had on the bench. Moreover, the internal construction is masterfully done. A quick glance at the internals ( Fig. A ) clearly demonstrates that this amp line has steadily evolved since the inception of the SVT brand. The layout features a preamp section that is nicely shielded from the power supply and power amp sections. A daughter card hosts the back panel jacks. The preamp section hosts a nice blend of tube circuitry, holding a single 12AX7 tube, a Vactrol-based (optocoupler) analog compressor circuit, surface-mount components and nice, panel-mount potentiometers that feel smooth when turning ( Fig. B ). The main circuit board hosts the class-D output section and power supply. The result is a layout with minimal wire runs and a neat, intuitive organization. Understanding the Amp Referring to Fig. C , the SVT-7Pro includes a single input jack, and a switch for engaging a 15dB pad. From the input, the signal is split into two paths. A first path couples to a buffered tuner output. A second path couples to the input of the first tube stage. The output of the first tube stage couples to a mute circuit. As such, muting will not affect the tuner output. After the mute circuit, the signal passes through the compressor circuit. The compressor circuit utilizes a Vactrol for the gain control cell. The output of the compressor couples to a second tube stage for gain recovery. The output of the second tube stage feeds the Gain control, as well as the tone stack. Accordingly, the compressor Fig. D Fig. F Fig. E  %&& !$%# Publication List Using a screen reader? Click Here |
