Vintage Guitar - September 2018 - Open - 46

BY DAVE HUNTER

A

s soon as guitarists began gushing over the lush, watery sound of
reverb-equipped amps of the early '60s, tone snobs bemoaned how
the effect softened and muted the amp's voice. Rather than making it sound
nebulous and diffuse, couldn't there be a way to add reverb while retaining
everything good?

VINTAGE GUITAR

46

September 2018

1965 GUILD THUNDER 1 REVERB
* Preamp tubes: three 12AX7s, plus the triode
portions of two 6GW8s and one 6BM8.
* Output tubes: the pentode portions
of two 6GW8s for main output, and
of one 6BM8 for reverb output.
* Rectifier: 6CA4 (a.k.a. EZ81)
* Controls: Volume (pull Bright), Treble, Bass,
Tremolo Strength and Speed, Reverb
* Speaker: one 12" CTS (main), one 8" CTS (reverb)

Amp courtesy of Marcel Cavallé, photos by Andrea Nieto.

WET/DRY
BAG
The Guild Thunder 1 Reverb

Indeed there was! And
Guild - along with a
handful of other makers - would be at the
forefront.
The solution, as represented in this '65
Guild Thunder 1 Reverb, did what players
today often do - use
independent signal
paths, each amplified
at a dedicated speaker.
Guitarists now call it
a "wet/dry rig," which
uses a primary amp for
the effect-less sound
and another (or two
for stereo reverb and/
or delay) for the effected sound, with
signal often taken from
the output of the first.
This is exactly how
Guild did it for this
amp, though the company crammed it all
into one handy box.
Put simply, its core
follows the same circuit as the smaller,
reverb-less Thunder
1, but adds a line-level
network tapped off the
speaker output using
a simple capacitor and
resistor in series, much
as any modern maker
would do to add a DI
output to a tube amp.
This signal is sent to a
spring pan from the
other end of which it's
recovered and passed to
a second full-power amp and transformer
that broadcasts it through a second, smaller
speaker. Voila! Undiluted dry signal and lush,
independent wet signal from the same 21.5"
x 22.5" x 9" cabinet.
Isolate those stages, though, and the Thun-


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