Butler Audio MONAD A100 manual Description, Power Output, Protection

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 jack 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. It will prevent a catastrophic over-current