Butler Audio TDB 5150 Manuale Utente

 

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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 

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.   

 

Power Output: 
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 

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 

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. 

  

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.