Butler Audio TDB 3150 User Manual
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Product Description:
Butler Audio Models 5150 is a vacuum tube-driven 5-channel power
amplifier. Each channel Power Module is completely independent
and includes separate RCA input and 5-way speaker output binding
posts, vacuum tube, rectifier & filter capacitors, electronic
components, protection and output power devices, etc. Butler
components, protection and output power devices, etc. Butler
Audio Model 3150 is identical to all descriptions within this booklet
except that Power Modules 2 and 4 have been removed for a total
of 3 channels. An internal AC Relay is provided for remote operation
from a pre-amp capable of providing a voltage of 8 - 13V DC (either
polarity) via the 3.5mm input jack on the rear panel.
polarity) via the 3.5mm input jack on the rear panel.
Note: Leave the front panel AC Power switch in the "OFF" (down) position for
remote operation.
remote operation.
Power Output:
Each channel is powered by a separate secondary winding from the
Each channel is powered by a separate secondary winding from the
massive 2KW-rated power toroid transformer. This yields a power
rating of 150 Watts, RMS per channel into 8 Ohms, all channels
operating simultaneously. Each channel is also capable of producing
225 Watts, RMS per channel into 4 Ohms. An appropriate source
of 115 -120VAC nominal input line voltage with a minimum current
of 115 -120VAC nominal input line voltage with a minimum current
supply of 15A for the 5150 or 12A for the 3150 is required.
230VAC models require approx. 50% of the current rating of 115-
120V models.
Protection:
Listed below are the various types of internal protection provided
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) Protection against AC input line transient voltage spikes and
surges.
3) Slow vacuum tube filament warm-up: Provides safe, fully
regulated, slow turn-on 6.3VDC for the tube heater filaments.
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 20 - 30 sec. after
turn-on. This provides for safe vacuum tube warm-up and
output stabilization.
Note: Due to normal component tolerance differences, some power
modules will click "on" earlier than others.
modules will click "on" earlier than others.
5) Main DC Power (+/- 65V) Fuses: A red LED will be visible from
the front panel adjacent to the tube of the affected channel if a
fault condition causes a fuse to open.