Bryston BP20, BP25 User Manual

OWNER’S MANUAL

Instructions For

Bryston PreAmplifiers

Models BP20 & BP25

IMPORTANT SAFETY INSTRUCTIONS

The lightning flash with arrowhead symbol within an equilateral triangle, is intended to
alert the user to the presence of uninsulated "dangerous voltage " within the product's
enclosure that may be of sufficient magnitude to constitute a risk of electric shock to per­sons.

The exclamation point within an equilateral triangle is intended to alert the user to the

presence of important operating and maintenance (servicing) instructions in the literature

accompanying the product.

1. Read these instructions.

2. Keep these instructions.

3. Heed all warnings.

4. Follow all instructions.

5. Do not use this apparatus near water.

6. Clean only with dry cloth.

7. Do not block any ventilation openings. Install in accordance with the manufacturer's instruc
tions.

8. Do not install near any heat sources such as radiators, heat registers, stoves, or other appara
tus (including amplifiers) that produce heat.

9. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has
two blades with one wider than the other. A grounding type plug has two blades and a third
grounding prong. The wide blade or the third prong are provided for your safety. If the provid
ed plug does not fit into your outlet, consult an electrician for replacement of the obsolete out
let.

10. Protect the power cord from being walked on or pinched particularly at plugs, convenience
receptacles, and the point where they exit from the apparatus.

11. Only use attachments/accessories specified by the manufacturer.

12. Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer,
or sold with the apparatus. When a cart is used use caution when moving the
cart/apparatus combination to avoid injury from tip-over.

13. Unplug this apparatus during lightning storms or when unused for long periods of time.

14. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has
been damaged in any way, such as power-supply cord or plug is damaged, liquid has been
spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or
moisture, does not operate normally, or has been dropped.

"WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS
APPARATUS TO RAIN OR MOISTURE".

"DO NOT EXPOSE THIS EQUIPMENT TO DRIPPING OR SPLASHING AND ENSURE THAT NO
OBJECTS FILLED WITH LIQUIDS, SUCH AS VASES, ARE PLACED ON THE EQUIPMENT".

"TO COMPLETELY DISCONNECT THIS EQUIPMENT FROM THE AC MAINS, DISCONNECT THE
POWER SUPPLY CORD PLUG FROM THE AC RECEPTACLE".

"THE MAINS PLUG OF THE POWER SUPPLY CORD SHALL REMAIN READILY OPERABLE".

BP20/25 PreAmplifiers

General Specifications:

Frequency Response:

20Hz-20kHz +/- .05dB

Maximum Output:

15 volts unbalanced, 30 volts balanced

IMD/THD: <0.0015% at 3 volts out

Sensitivity:

Balanced inputs: 1.00 V
UnBalanced line level inputs: 500 mV

Rated Noise:

-100dB (Ref. 500mV unbalanced input, 20-20kHz)

-103dB (Ref. 1 volt balanced input 20-20kHz)

XLR Connector Pin out (Balanced I/O):

Pin 1 ground, pin 2 positive, pin 3 negative

Features:

 2 pair balanced female XLR inputs
 1 pair balanced male XLR outputs
 5 pair RCA inputs
 4 pair RCA + 1 pair phono inputs (BP-20/25P and BP-

20/25MC only)

 4 pair RCA + 2 SPDIF digital inputs (BP20/25 DA only)
 2 pair RCA outputs
 1 tape loop

Options:

 Silver faceplate & hand held remote (std. is black)
 19” x 1.75” Rack mount faceplate (std. 17” long)
 Moving magnet RIAA phono equalization module
 Moving coil & moving magnet RIAA phono EQ

module

 Digital audio input (SPDIF) module

Dimensions:

Standard version: 17” x 1.75” x 11”

43.18cm x 4.44cm x 28cm

Rack mount version: 19” x 1.75” x 11”

48.26cm x 4.44cm x 28cm

Weight: 17 lbs (7.5 kg)

MPS-1 POWER SUPPLY SPECIFICATIONS:

Dimensions: 7.75” x 4.525” x 2.36”h
Weight: 2.6 lb. (1182g)
Electrical:

120VAC/60Hz/29VA, Fuse: 315mA/250V time lag
230VAC/50Hz/29VA, Fuse: 160mA/250V time lag
240VAC/50Hz/29VA, Fuse: 160mA/250V time lag

Output: +/-28VDC @ 350mA (56VDC @ 700mA)

All fuses are 5mm x 20mm, time lag type and are accessi­ble only by removing the top cover. When replacing
fuses, disconnect the power cord before opening the unit!

Recommended replacement fuses:
for 100/120VAC models: Littlefuse 218.315

Bussmann GMC-315mA

for 230/240VAC models: Littlefuse 218.160

Bussmann GMC-160mA

Additional Specifications for BP20/25DA:

Input Sample Rate: 16kHz to 108kHz.
Word Length: 16, 18, 20, 24 Bit
Data format: SPDIF standard
Distortion: < 0.002%, 20Hz-20kHz
Signal to Noise Ratio: > 100dB
Frequency Response: 20Hz-20kHz +/- .1dB

Additional Specifications for BP20/25P
Phono Inputs:
Distortion:

<0.005%, IM or THD, any frequency or combination of fre­quencies from 20-20kHz, at rated output or below.

Rated Noise:

Phono: -80dBA referred to an input of 5 millivolts RMS @
1kHz

RIAA Accuracy:

Within less than +/- 0.05dB from 20-20kHz inclusive

Input sensitivity: 5mV

Additional Specifications for BP-25MC
Phono Inputs:

Distortion:

<0.005%, 20-20kHz, with preamplifier driven to full rated
output

Noise:

Equivalent to approximately 1000 ohm metal film register
(Thermal noise greater than 85dB below 0.6mV input,
unweighted)

Gain: 16.5 or 22.5dB (internally reconfigurable)

Frequency Response: Below 5Hz to above 30kHz, within

less than +/- 0.5dB

Input sensitivity: 350uV (0.35mV)

2

Sept 2003