1988 Keene, NH
One day at my shop I was asked what would I build
for an amp, and I siad
that I'd incorporate features from my favorite amp
and call it the Warbler.
1989 Woodstock, NY
On a trip to S. Carolina I designed the first
Warbler and built it up a month later.
The amp exceeded my egocentric expectations and
ended my quest for the perfect amp.
1992 - 1993 Orlando, FL
Found a source of varistors and began formulating
an amp strategy.
Diverted to Microphone development project.
1994 -1996 Troy, NH
Began building prototypes and custom amps for
embodied elements from the 5 major amp companies in
that changed how popular music was expressed and
Standardized a production amp the Juke 1210
Set up a website to sell direct to musicians as
Added the Juke 810 harp amp and the Juke 112 &
Introduced four new models with very different
tonalities: the Warbler, the Coda, Vamp and
NH Technical Institute
Institute of Audio Research
York, NY 1973
Tube audio hobbyist 1962-66
electronic repairs since
in Musical Electronics
and Repair since 1974
Restorations since 1988
Amps since 1989
which influenced the Warbler Design
5E4 Super Amp, Princeton Reverb and Vibro Champ
Tweed Falcon and GA-30RVT
Troubadour 213-A, Custom 260 and MP13-A
Several Supro, Gretsch, Harmony and Airline
(wôr' blõr) n. music. a singer; one
that warbles; to sing with
trills, quavers, or melodic embellishments
(myáz) n. a source of inspiration;
(ják) Southeastern U.S. n.
musical happening; a roadhouse
with music for dancing. intr.v. To dance,
in a roadhouse or to the music of a
Miscellaneous Amp Info
Ceramic Bulk Varistors
(Rod VDR's voltage-dependent-resistors)
Fired-ceramic components consisting of silicon
carbide selected and processed
for special electrical properties, and dispersed in
a ceramic matrix.
Equivalent circuit is a R-C network. Specs to 10%
tolorence are generally considered symmetrical
in electrical characteristics, having a maximum
non-symmetry of 1%.
not be measured by a ohmmeters or bridge resistance
circuits, because they are voltage sensitive.
Specifications are derived from a calibration
circuit or characteristic curves.
All Magnatone varistors fit one set of specs. The
Manufacture list 23 rod types in 3 wattages
and only one matches the specs for the type found
in Magnatone amps
The company that has produced this type of
varistors for 60+ years,
had no knowledge of them being used in an audio