The Roland Bolt 30/60/100 was the only line of
tube
Tube or tubes may refer to:
* ''Tube'' (2003 film), a 2003 Korean film
* "Tubes" (Peter Dale), performer on the Soccer AM television show
* Tube (band), a Japanese rock band
* Tube & Berger, the alias of dance/electronica producers Arndt Rör ...
guitar amplifier
A guitar amplifier (or amp) is an electronic amplifier, electronic device or system that strengthens the electrical signal from a Pickup (music technology), pickup on an electric guitar, bass guitar, or acoustic guitar so that it can produce so ...
s produced by
Roland
Roland (; ; or ''Rotholandus''; or ''Rolando''; died 15 August 778) was a Frankish military leader under Charlemagne who became one of the principal figures in the literary cycle known as the Matter of France. The historical Roland was mil ...
. The Bolt amplifier series was released in 1979.
The Bolt amplifiers used an hybrid circuit, with a Mosfet-based solid state preamp section and an all Tube power amp.
In the case of the Bolt 60 the power amp section is an exact clone of the Fender AB763 circuit, it uses two 6L6GC power tubes and one 12AT7 Phase Inverter. The amplifiers have two channels, clean and Overdrive, switchable on the front panel or through a foot-switch. Aside from the overdrive circuit, the amp contains a
spring reverb
A reverb effect, or reverb, is an audio effect applied to a sound signal to simulate reverberation. It may be created through physical means, such as echo chambers, or electronically through audio signal processing. The American producer Bill ...
and provision for external effects using the effects loop.
The Bolt was produced until 1984.
Both combo (amp/speaker) and 'head' versions of these amplifiers were produced, and three models were released: the Bolt 30 (30 watts), Bolt 60 (60 watts) and the Bolt 100 (100 watts).
References
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Instrument amplifiers