Conrad-Johnson LP260m mono-
block power amplifier Owner’s Manual
10
Specifications
Power: 275
watts rms into 4 ohms from 30Hz to 15KHz at no more
than 1.5% total harmonic distortion (can be re-connected
internally for 8 or 16 ohm loads).
Sensitivity: 1.8 V rms to rated power
Small Signal Distortion: less than .2% at mid-band
Frequency Response: 20Hz to 20 kHz +0/-.25 dB
Hum and Noise: 108 dB below rated power output
Phase: phase correct
Input Impedance: 100 kOhms
Mechanical
Dimensions: 18.75"D x 19"W x 7.13"H
Net Weight: 81 lb net
Fuses
The LP260m mono-block power amplifier power transformer is
protected by a fuse on the ac power line (F5, located in a
compartment in the ac line-cord receptacle mounted on the back of
the amplifier), and by four separate internal fuses on the secondary
circuits of the transformer (F1 – F4) located on the bottom of the pc
board. A failure of any of these fuses is a symptom of a more
serious problem, and a competent service technician should be
consulted. In no event should fuses be replaced with a value or
type different than that originally supplied. The correct fuse values
and types are:
F5: 5x20mm 10 amp T-type if configured for 100 or 120V:
5x20mm 6.3 amp T-type if configured for 220 or 240V.
F4: 3AG type 4 amp, slow blow
F1, F2, and F3: ¼ amp, slow blow
The output stage is protected by a plate fuse in series with the
output tubes. This is a 5x20mm 2A fast-blow ceramic fuse, located
inside the chassis in fuse holders mounted on the vertical power
supply board.
