MONAD A100
C U S T O M
OWNER'S INFORMATION FOR
“MONAD” A100
CLASS A 300B
VACUUM TUBE DRIVEN
MONOBLOCK POWER AMPLIFIER
UTILIZING
T H E R M I O N I C
VACUUM TUBE TECHNOLOGY
b
Concept & Design: B K Butler
HAND BUILT & Patented in the USA
Worldwide patents pending
"Monad”, Tube Driver", "Tube Driver Blue" and "Thermionic" are trademarks of or patented by
BK Butler
Contents
Congratulations………..…………………………………… 1
Product Description
Power Output
Protection………………………………………………..…… 2
Use and Operation
Front Panel Power Switch
Rear Panel Remote Jack ………………………...…….. 3
Inputs
Speaker Output Binding Posts
Speaker Phasing
Remote Operation….…………………….…….....……… 4
Specifications……….…………………………………..…… 5
Cable Quality
The Marvelous Vacuum Tube ………..………………. 6
Tube Reliability……………………………………………….. 7
Warranty & Repair Policy….…………………………… 8
Congratulations from BK Butler
Please accept my sincere thanks and congratulations for making your
musical choice my hand-made “MONAD” A100 amplifier. This new
USA-Patented technology is an inherently classic design.
Definition:
MONAD: “The ineffable source of all being and existence. Singly
superior to all others yet fully known only to itself”…
…
After more than 25 years of tube audio experience in the Professional
Music Industry with some of the world's greatest musical talents, I’ve
created an entirely new type of tube audio amplifier. Utilizing the
incomparable qualities of our proprietary audiophile-grade 300B
power triode in SE Class A mode, an amplifier without equal has been
achieved. Producing more than 100Watts RMS of power with ZERO
negative feedback and greater than 2 Farads (2,000,000 uF) of
primary Class A voltage supply filtering on board, the MONAD rightly
becomes the new vacuum tube audio standard of the industry.
The Past is the Future u
The MONAD A100 incorporates the finest application of the pure
"Edison Effect," or the essence of Thermionic vacuum tube emissions
to produce every nuance and characteristic of the best classic SE
300B triode tube amplifiers at more than 10 times the previous
usable power. With painstaking efforts and great attention to detail,
the sonic response, load and transfer characteristics of the classic
300B power triode tube have been carefully balanced to operate
under optimum conditions at extremely useful and satisfying power
output levels.
This groundbreaking design completely eliminates one of the most
inefficient and non-musical components in typical 300B SE amplifiers:
the Output Transformer. Without hundreds of feet of phase-shifting,
musicality-robbing wire and many pounds of induction-generating core
iron to overcome, my newly patented current-multiplying DC coupling
circuitry allows the 300B output driver tube to directly operate into a
fixed ratio-reduced speaker output load. This novel design results in
the production of authentic triode tube characteristics many times
greater in power than the normal capability of 300B tubes yet all their
superior musical qualities are retained.
I invite you to enjoy the finest 300B SE amplifier on the planet. The
CNC casing has been precision machined from the finest billet
aluminum. Over 100 hrs. were spent on the machining, fit and finish of
the case alone. The MONAD A100 is truly the result of a painstaking
labor of love for the art. It has been my pleasure to design and build
this finest of amplifiers for you.
Sincerely,
BK Butler, Designer and Builder
Description:
BK Butler’s MONAD A100 is a 300B Class A vacuum tube-driven
monoblock power amplifier. Both RCA and true BALANCED
precious metal plated input jacks of the highest quality are
provided. The RCA input ja ck and the 5-way speaker output binding
posts are top of the line Cardas. The 300B vacuum tube is
proprietary Butler design and manufactured per our specifications.
Sprague polypropylene capacitors, Vishay-Dale mil-spec 1%
resistors are employed throughout the entire audio chain. Internal
circuitry interconnections are positive military-type screw
connectors utilizing #10 hardware.
Power Output:
The MONAD A100 is powered by a 700W toroid power
transformer, which easily provides the necessary reserve power
necessary for continuous operation. An exceptionally large heat
exchange area on the internal heatsink is coupled into the large bulk
and mass of the CNC custom chassis for remarkably cool
operation. The MONAD A100 has reserve power capable of
producing 200 Watts into 4 ohm loads. Therefore an appropriate
source of 120VAC nominal input line voltage with a minimum
current supply of 5A is required. 230-240 VAC models require
approx. 50% of the current rating of 120V models.
Protection:
Listed below are the various types of internal protection provided
for unexpected conditions:
1. AC input fuse for protection against any major system power
fault. Do not replace with a fuse of higher current rating.
2. Thermistor-protected against AC input line transient voltage
spikes and surges.
3. Soft-start vacuum tube filament warm-up: Provides safe, fully
regulated, gentle turn-on 5.0 VDC for the 300B tube heater
filament. This technique promotes longest tube life.
4. Turn-on and warm-up transient delay: This circuit will not allow
the speaker relay to close (connect power module output to
speaker posts) for a delay of approximately 5 - 8 sec. after
turn-on. This provides for safe vacuum tube warm-up and
output stabilization.
5. DC Offset Voltage at Speaker Output: Continuous monitoring
circuit immediately opens the speaker relay upon the
detection of any excessive DC voltage level.
6. Short circuit protection: This continuously active circuit
becomes effective to the speaker output below a load of
approx. 2 ohms. I t will prevent a catastrophic over-current
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