Vintage Guitar - September 2018 - Open - 47

der 1 Reverb is also different in several ways.
The Mic, Normal, and Bright inputs all have
various grid-stopper resistors (with bypass
caps on the latter two), but they junction into
the same first gain stage, provided by half of
one of the amp's three 12AX7s. In all, there
are three gain stages in the preamp, plus a
cathode-follower stage, which would be a lot
of gain stages - like, Marshall-JCM800-2204
lot - except that everything is done very differently. The first two are biased very cold, so
they don't add a ton of gain early in the signal
path, and the cathode-follower follows the
tone controls rather than preceding, as in the

classic tweed-Bassman/JTM45/plexi topology.
Treble and Bass follow the first gain stage and
constitute an EQ stage more like you'd find in
a tube hi-fi system of the day. Following that,
after the cathode-follower configured of the
second half of the first 12AX7, the signal passes
through either leg of a Bright switch (a push/
pull on the Volume pot), before finally hitting
the Volume control, from which it passes to
the second proper gain stage comprising half
of another 12AX7, then the third gain stage -
essentially a "driver" stage ahead of the phase
inverter... which is where things get even more
interesting.

VINTAGE GUITAR

47

September 2018

The 12" CTS speaker receives signal from
the main amp, while the 8" CTS is connected
to the independent reverb amp. The simple
L-shaped chassis is loaded with Philips Mullard
"mustard caps" and other tasty components.

Rather than the 6V6s or EL84s so many
makers were using at the time to achieve 12
watts of push/pull power, Guild opted for a
pair of 6GW8s, as seen in smaller British and
European amps (under the moniker ECL86),
but even more commonly found in consumer
audio - radios, gramophones, hi-fi amps, and
the like. This nine-pin tube looks much like


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Table of Contents for the Digital Edition of Vintage Guitar - September 2018 - Open

Contents
Vintage Guitar - September 2018 - Open - Cover
Vintage Guitar - September 2018 - Open - IFC
Vintage Guitar - September 2018 - Open - 3
Vintage Guitar - September 2018 - Open - 4
Vintage Guitar - September 2018 - Open - 5
Vintage Guitar - September 2018 - Open - 6
Vintage Guitar - September 2018 - Open - 7
Vintage Guitar - September 2018 - Open - 8
Vintage Guitar - September 2018 - Open - 9
Vintage Guitar - September 2018 - Open - Contents
Vintage Guitar - September 2018 - Open - 11
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Vintage Guitar - September 2018 - Open - 14
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Vintage Guitar - September 2018 - Open - 18
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Vintage Guitar - September 2018 - Open - 37
Vintage Guitar - September 2018 - Open - 38
Vintage Guitar - September 2018 - Open - 39
Vintage Guitar - September 2018 - Open - 40
Vintage Guitar - September 2018 - Open - 41
Vintage Guitar - September 2018 - Open - 42
Vintage Guitar - September 2018 - Open - 43
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Vintage Guitar - September 2018 - Open - 45
Vintage Guitar - September 2018 - Open - 46
Vintage Guitar - September 2018 - Open - 47
Vintage Guitar - September 2018 - Open - 48
Vintage Guitar - September 2018 - Open - 49
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Vintage Guitar - September 2018 - Open - IBC
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