Owner’s Manual
for the
BV-50H
All Tube Professional Series
Guitar Amplifier
®
by
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®
BV-50H Guitar Amplifier
Introduction:
The BV-50H is a feature-packed professional stage performers' amplifier. Rugged construction, reliable
American craftsmanship and two powerful channels of pure tube power are some of the trademarks of this
new and impressive piece of musician's equipment. This amplifier features two distinctly different 12AX7
tube-driven channels: one with classic tube rhythm sounds and one offering you some of the finest lead
and overdrive sounds of any stock amplifier.
Each channel features an all-tube preamp section with three bands of equalization for total tone con-
trol. The master Presence control lets you custom tailor the sound of your guitar to suit your particular
needs.
The Line Out signal is tapped directly from the speaker outputs, then attenuated and frequency-compen-
sated to replicate the sound of a miked speaker cabinet. Two pairs of speaker output jacks provide easy
impedance matching with a wide variety of cabinet configurations.
Features:
Here's a quick overview of the BV-50H's features and controls. Additional information can be
found on the pages indicated.
• Patented Channel Switching Circuitry: Achieves maximum use of each preamp tube - so unique
it's patented!
• Adjustable Presence Control: Fully adjustable upper harmonics level for changing the "presence"
of both channels (page 4).
• Auto-Biasing Circuitry: Want to change your sound? Change your tubes! Internal circuitry allows
the use of either 6L6 or EL34 power tubes with no bias adjusting (page 7).
• D.C. filament supply for first stage: eliminates the need for a “hum balance” control.
• Effects Loop: For noiseless patching of external effects, or use as a preamp out/power amp in con-
nection (page 5).
• Line Out Jack: Taken directly from the speaker output signal! This frequency compensated output
lets you patch into house sound boards, recording consoles, etc. with ultimate sonic fidelity (page
5).
• Footswitch Jack: This stereo jack - (tip for channel selection and ring for reverb on/off control) -
allows use of a two-button footswitch (page 5).
• Speaker Jacks: Impedance-matched speaker connectors allows at least four different cabinet con-
figurations (page 5).
• High Cosmetic Appeal and Stage Presence: The unique cosmetics of the BV-50H serve as a trib-
ute to your good taste in musical equipment.
3
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BV-50H Guitar Amplifier
The Front Panel:
Channel 2:
1. INPUT: Connect your guitar or wireless
receiver into this standard 1/4" jack using a
shielded instrument cable.
7. GAIN: Adjust the overdrive (distortion) level
with this control. In addition to gain changes,
this control also modifies the tone. At low and
mid gain settings the overdrive is very bluesy.
Reducing the volume at the guitar cleans up the
signal to be similar to Channel 1. However, at
high gain settings the guitar signal is contoured
to add punch in the middle frequencies for a
thick, heavily saturated overdrive.
12. REVERB: Adjust the amount of reverbera-
tion with this control: at the "0" position the sig-
nal is "dry" (no reverb). As you bring the control
up, the amount of reverb increases.
Channel 1:
2. VOLUME: Set the output volume level of
13. PRESENCE: Increase the level of upper
harmonics with this control. The presence con-
trol allows a boost of up to 5dB at 10kHz.
channel 1 with this control.
3. LOW: Adjust the bottom end response with
this control. The low control covers a range of
16dB at 100Hz.
14. STANDBY: This switch activates the ampli-
fier, and should always be turned on last. The
switch lights up when the high voltage power is
passing through to the tubes.
8. LOW: Adjust the bottom end response with
this control. The low control covers a range of
6dB at 100Hz.
4. MID: Adjust the midrange response with this
control. The mid control covers a range of 23dB
at 300Hz.
NOTE: When you first power up this amplifier,
leave the Standby switch OFF for at least 20
seconds. This gives the power tubes a chance
to prepare themselves for action.
9. MID: Adjust the midrange response with this
control. The mid control covers a range of 13dB
at 700Hz.
5. HIGH: Adjust the high end response with this
control. The high control covers a range of
25dB at 10kHz.
10. HIGH: Adjust the high end response with
this control. The high control covers a range of
12dB at 10kHz.
15. POWER: This switch applies AC voltage to
the amplifier, and should always be turned on
first. The switch lights up when the AC power is
on.
6. CHANNEL: Switch between channels with
this push-button switch. The adjacent amber
LED glows when channel 1 is selected (switch
"out"), the red LED glows when channel 2 is
selected (switch "in"). When a footswitch is
used for channel switching, this switch is dis-
abled.
11. MASTER: Set the output signal level of
channel 2 with this control. At the "0" position
(full left) very little or no signal will be heard; as
you bring the control up (towards center) the
output level of channel 2 increases. Use this
control along with your guitar's volume and the
Gain control (#7) to produce a wide variety of
sounds.
4
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BV-50H Guitar Amplifier
CAUTION
M A D E I N T H E
RISK OF ELECTRIC SHOCK
DO NOT OPEN
U . S . A .
5 , 0 1 2 , 1 9 9
AVIS:RISQUE DE CHOC ELECTRIQUE.
NE PAS OUVRIR
TW0 16 OHM
ENCLOSURES
TWO 8 OHM
ENCLOSURES
B Y S L M E L E C T R O N I C S
–
1 4 0 0 F E R G U S O N A V E .
–
S T . L O U I S , M O . 6 3 1 3 3
U . S . P A T E N T
#
WARNING: TO REDUCE THE RISK OF FIRE OR
ELECTRICAL SHOCK, SO NOT EXPOSE THIS EQUIP-
MENT TO RAIN OR MOISTURE.
CAUTION:
TO
REDUCE
THE RISK OF FIRE, REPLACE
FUSE WITH SAME TYPE AND
RATING.
MODEL
SERIAL #
BV-50
AC LINE IN
CH. SEL./
REVERB
SEND
RETURN
ONE 8 OHM
ENCLOSURE
ONE 4 OHM
ENCLOSURE
ATTENTION:
UTILISER
EFFECTS
LOOP
LINE
OUT
SPEAKER CONNECTIONS
50 WATTS RMS
100V
230V
-
-
125V
250V
T2.5A SLO-BLO
T1.5A SLO-BLO
UN FUSIBLE DE RECHARGE
DE MEME TYPE.
FOOTSWITCH
115VAC–60Hz
300 WATTS MAX.
16
17
18
19 20
21
22
The Rear Panel:
16. FUSE: This fuse protects the amplifier
against damages caused by overload condi-
tions in the unit. If the fuse blows, replace it only
with the same size and type as indicated on the
rear panel. If the fuse blows continually, the line
voltage may be incorrect, or the amp may need
servicing.
19. EFFECTS LOOP SEND: Connection to an
external effects device is made via this jack.
Connect a shielded instrument patch cord from
the send jack to the input jack of the effect. The
send jack also doubles as a "preamp out" jack,
to feed a post-eq signal to a mixing board,
recording console or external amplifier.
22. SPEAKER JACKS: Use these unbalanced
1/4" jacks to connect the amplifier to your
speaker cabinet(s) as shown below.
NOTE: You may use any configuration of
impedances shown at the speaker output
jacks. Impedance matching is automatic:
simply connect the cabinet(s) to the jack(s)
labeled with the corresponding imped-
ance(s).
17. AC LINE IN: Firmly plug the female end of
the supplied power cord into this socket, push-
ing it in until it is fully seated. Plug the male end
of the cord into a properly grounded AC outlet of
the correct voltage. DO NOT DEFEAT THE
GROUND PIN OF THE AC PLUG! Use only
the supplied power cord. If the amplifier is to be
used outside of the United States, see your
authorized Crate dealer for information about
alternate line cords and power converters if
needed.
20. EFFECTS LOOP RETURN: Connection
from an external effects device is made via this
jack. Connect a shielded instrument patch cord
from the output jack of the effect to the return
jack. The return jack also doubles as a "power
amp in" jack, to feed a line-level signal directly
into the BV-50H's internal power amp. This is
useful when "slaving" two amplifiers together.
# of CABS
& IMPED(S)
1 @ 4 ohms
1 @ 8 ohms
2 @ 8 ohms
2 @ 16 ohms
JACK
JACK
LABEL(S)
4 OHM
LOCATION(S)*
#3
#1
#3,4
#1,2
8 OHM
2-8 OHM
2-16 OHM
* Jacks numbered here for purpose of illustration only:
21. LINE OUT JACK: This 1/4” jack supplies an
unbalanced output signal from the power amp
for patching into a mixing board, recording con-
sole or external amplifier. The signal is elec-
tronically compensated to simulate the sound
from a "miked" cabinet, and comes directly from
a tap off of the output transformer. This gives
you the tone of your preamp and power amp
tubes!
TW0 16 OHM
ENCLOSURES
TWO 8 OHM
ENCLOSURES
1
2
3
4
18. CHANNEL SELECT / REVERB FOOT-
SWITCH JACK: Connect a stereo 1/4" plug
(tip/ring/sleeve) here from
footswitch for control of channel switching and
reverb. The tip of the jack is for channel switch-
ing; the ring is for reverb on/off. When a
footswitch is connected here, the front panel
channel select switch is disabled.
ONE 8 OHM
ENCLOSURE
ONE 4 OHM
ENCLOSURE
SPEAKER CONNECTIONS
50 WATTS RMS
a
two button
To avoid damaging the amplifier and the
speaker cabinets, don’t use two 4 ohm cabi-
nets, or one 8 ohm and one 4 ohm cabinet at
the same time. Do not connect a single 16
ohm cabinet to the speaker output jacks.
A SPEAKER LOAD MUST BE CONNECTED
TO THE AMPLIFIER TO AVOID DAMAGING
THE UNIT.
5
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BV-50H Guitar Amplifier
Some Suggested Settings:
SPARKLING CLEAN:
BLUESY:
METAL:
SINGING:
6
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BV-50H Guitar Amplifier
A Word About Tubes:
Vacuum tubes can only last so long. Allowing your amp to cool down before moving it will help prolong the life of
the tubes. Even so, after about a year (or sooner if you're on tour or jammin' more frequently than most) you may
notice the output of your amp just isn't as "alive" as it used to be. If the sound from your amplifier starts to grow weak,
lacks punch, fades up and down, loses highs and lows, gets "funny" (clanking sounds, etc.), it's very likely that the
power tubes are worn out and need replacing. Since power tubes work together in an amplifier, it is important that they
all be replaced at the same time with a matched set of tubes.
If you're looking to change the sound of your amp, you can replace the stock 6L6 power tubes with EL34's. 6L6
tubes tend to give you more of the "American" sound, with lots of solid power, even up to their full output, with a lot of
dynamic headroom. EL34 tubes tend to give you that "English/British" sound: they distort sooner and provide a more
controllable and less penetrating distortion effect when overdriven. Either way, your BV-50H has been engineered to
facilitate power tube replacement, with automatic biasing when changing tube types. IF YOU DON'T CONSIDER
YOURSELF ADEPT WITH A SCREWDRIVER, REFER POWER TUBE REPLACEMENT TO A QUALIFIED SER-
VICE CENTER. Otherwise, unplug your amp, allow it to cool for at least thirty minutes, and proceed as follows:
• Turn the amp so you're looking at its rear panel.
• Unscrew and remove the wooden rear cover.
• Remove the power tubes one at a time by slightly spreading the wire tube clamps with one hand and gently
pulling the tube out of the socket with the other hand.
• When inserting new power tubes, carefully align the tab in the tube's plastic base with the slot in the socket
and press the tube gently but firmly into place.
• Replace the rear cover piece and tighten the screws. (Avoid over tightening.)
• Power up the amplifier and let it sit for at least twenty minutes before playing.
If the amp starts to squeal, gets noisy, loses gain or starts to hum, the preamp tubes may be bad. Since removal
of the tubes may expose extremely hazardous voltage levels, always refer replacement of the preamp tubes
to a qualified service center. Insist upon using only the highest quality, low-microphonic tubes!
System Block Diagram:
CH. 1 LED
CH. 2 LED
FOOTSWITCH
PATENTED
SWITCHING
CONTROL
STANDBY
POWER
POWER
SUPPLY
GAIN
EFFECTS LOOP
POWER
AMP
SPEAKER
OUTS
INPUT
TUBE
STAGE
TUBE
STAGE
TUBE
STAGE
TUBE
STAGE
REVERB
PRESENCE
VOLUME LOW MID HIGH
LOW MID HIGH MASTER
LINE
OUT
REVERB
LEVEL
7
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BV-50H Guitar Amplifier
Technical Specifications:
Output Power Rating
50 watts RMS nominal @ 5% THD
1M ohm
Input Impedance
Ch. 1
Ch. 2
System Gain
66dB
95dB
Tone Controls
Low
Mid
High
16dB range @ 100Hz
23dB range @ 300Hz
25dB range @ 10kHz
Low
Mid
High
6dB range @ 100Hz
13dB range @ 700Hz
12dB range @ 10kHz
Presence Control
5dB boost @ 10kHz
Effects Send/Return Level
Line Out Level
0.7V RMS nominal
0.4V RMS nominal, unloaded
12AX7 (3), 6L6 GT/5881 (2)
Tube Complement
Power Requirements
Size and Weight
115V 60Hz, 110VA; 2.5A Slo-Blo Fuse
10”H x 20”W x 10-1/2”D, 34lbs.
Crate continually develops new products, as well as improves existing ones. For this reason, the specifications and information in this manual are subject to change without notice.
The BV-50H is covered with high-quality, durable Tolex®. To keep it looking its best, avoid abrasive cleansers.
Wipe the cabinet clean using a slightly dampened soft cloth. Do not spray cleaners directly into the amplifier.
Never use brass cleaners on the hardware since they could damage their protective coatings.
®
©1996 SLM ELECTRONICS • A division of St. Louis Music • 1400 Ferguson Avenue • St. Louis, Mo 63133
P/N 47-584-51 • 10/96
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