Spectro Amp

All-Tube-Amplifier for Bass and Guitar

There is no need to reinvent the wheel, when building a new vehicle with some improvements. Nevertheless - reworking some details might be convenient - when you're looking for a significant improvement. This is, how you might discribe this Amplifier in the figurative sense. Some 'classical' circuitdesigns have been taken over, a lot has been redesigned and completely new developed. The result is at least an outstanding amp-project with an individual and unique look. The main characteristics of this amplifier are a 'big size' tone and excellent, detailed audio-response. Basicly  this unit  is an 'All-Purpose' Musical Amplifier and fits all audio applications. The power-amplifier, 100W or 200W r.m.s.  delivers  steady 25Hz to 18KHz fullrange audio power. However, in spite of the 'high quality' characteristics of the power amplifier, the preamp section is designed for Guitar and Bass - specialized for each instrument. Although the amplifiers requires only a few control elements, it offers a great versatility when operating 'Booster', Volume and Master-Volume in a right and skilful way. Thus the Amp can perform as a 'clean' Bass-Head as well as a 'furious Rock-Beast'. 

Secifications and Features - Overview

Power-Amplifier in Ultralinear connection   100W (4 x EL34) or 200W (4 x KT88) r.m.s. output

flexible preamp configurations to optimize the amp for bass or guitar. (2 kinds of Boosters and a variable Sound-Control design)

Modifications and Extensions:

 

 

 

 

 

3-Position Impedance-Switch

 

 

Weight:

 

 

Size:

iluminated (RGB)Fullcolour-Plexiglass-Frontpanel

Output Power-Switching  50/100W  or  100/200W

switched Speaker-Emulation at Di-Out

Single or Dual Tonestack

active 3-Band-Soundcontrol (specially for Bassamplifiers)

 

4 - 8 - 16 Ohm  (prefered for Guitaramplifiers)

2 - 4 - 8 Ohm  (prefered for Bassamplifiers)

 

Spectro GB100  ca. 17,5Kg (39lb)

Spectro GB200  ca. 23Kg (51lb)

 

Spectro GB100    610 x 240 x 230mm (Width, Depth, Heigth)  24"x 9,5"x 9"

Spectro GB200    610 x 285 x 230mm  (Width, Depth, Heigth)  24"x 11,2"x 9"


Tolexcover and colour at your choice

Flightcase available

Lettering in English or German

 

Download
Spectro GB100,200 Specifications.pdf
Adobe Acrobat Dokument 42.8 KB

Customizing the spectro amplifier

Controlpanel

Preamplifier with 3-Band Passive Soundcontrol

Preamplifier with 3-Band Passive, Dual-Tonestack Soundcontrol

Preamplifier with 3-Band Active Soundcontrol and 2 switchable frequencies each band (only available for 200W Amps at the moment)

Booster selection

                                             Bass-Booster

  Guitar-Booster - identical to the 'Hornet Tube Booster'


Both Bass- and Guitar-Booster are looking identical at the controt-panel. But they sound different and do have different circuitdesigns   

Rear connecting panel

Backview of a 200W Guitaramp with additional controlknobs for plexi-panel-light, speaker emulation switch and output-power switch

Output-connectors = phone jack                          Speaker-Selector-Switch = 4-8-16 Ohms 

Backview of a 200W Bassamp with additional controlknobs for plexi-panel-light, speaker emulation switch

Output-connectors = Speakon                            Speaker-Selector-Switch = 2-4-8 Ohms 

Backview of a 200W Bassamp with additional controlknobs for plexi-panel-light, speaker emulation switch and output-power switch

Output-connectors = Speakon                            Speaker-Selector-Switch = 2-4-8 Ohms 

Speaker Emulation

The switchable speaker-emulation delivers an output signal corresponding to the frequency response of a single loudspeaker in a cabinet.  There are different emulated models for both guitar- or bassamplifiers available.

Speaker emulated frequency response at the Di-Out of a Bassamplifier, equi-valent to the  performance of a 12" (PA)Bassdriver in a vented baffle-hole cabinet
Speaker emulated frequency response at the Di-Out of a Bassamplifier, equi-valent to the performance of a 12" (PA)Bassdriver in a vented baffle-hole cabinet
Speaker emulated frequency response at the Di-Out of a Guitar-Amplifier, equivalent to the performance of a 12" 'Vintage-Speaker' in an open cab
Speaker emulated frequency response at the Di-Out of a Guitar-Amplifier, equivalent to the performance of a 12" 'Vintage-Speaker' in an open cab

Illuminated Frontpanel

        Adjustment of all 'Rainbow'-Colours within one 300° Potentiometer turn. The right (max.) position will set the colour 'white'.


If you like to ask for prices, if you have other requests, please use the Exel sheet below at first to customize your desired amp. Please send the filled in sheet back to  post@wolfgang-behn.de  and you will hear from me as soon as possible.

Download
Customize Spectro(DE,EN).ods
Open Office Spreadsheet 312.5 KB