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Rivera KNUCKLE HEAD 2 Guía para resolver problemas Pagina 20

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7
Knuckle
Head
II
®
PRESENCE
POWER STANDBY
FOCUS MASTER 2 BASS MIDDLE TREBLE GAIN 2 MASTER 1 TREBLE MIDDLE BASS GAIN 1
BOOST SWEET SCOOP BOOST SELECTNINJA NOTCH BRIGHT
INPUTS
LOW
GAIN
HIGH
GAIN
HANDCRAFTED BY
RIVERA RESEARCH & DEVELOPMENT SYLMAR, CA USA
PULLPULLPULLPULL
CLEAN/RHYTHM LEAD/CRUNCH
PULL PULL PULL PULL
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TUBE CARE & REPLACEMENT
Like a sports car, there’s a certain amount of wear and tear to be expected in a high-performance tube
amp. Over time, especially with hard use, tubes may need replacement. That’s why it’s a good idea to
make note of when you purchased your amp and whenever you replace tubes. It’s no accident that your
amp has two common types of tubes: They’re great-sounding and reliable, and it’s easy to find replace-
ments. Here’s a tube chart to show you which tubes go where.
Location Type
V1 12AX7 (WA/WB)
V2 12AX7 (LP/LPS)
V3 12AX7 (WA/WB)
V4 12AX7 (WA/WB)
V5 12AX7 (LP/LPS)
V6 6L6 or EL-34
V7 6L6 or EL-34
V8 6L6 or EL-34
V9 6L6 or EL-34
Here’s a brief description of what each tube does:
V1 Input buffer and tone control driver for Rhythm Ch., and also the first preamp stage of LeadCh.
V2 Tone control follower for Rhythm Ch. and an additional gain stage for Lead Ch.
V3 Third gain stage for Lead Ch. and final gain stage for Rhythm Ch.
V4 Final gain stage for Lead Ch. and mixer for both channels
V5 Phase inverter driver tube for the power amp section
V6 - V9 Power amp tubes—for best operation, all power tubes should be changed at the same time
Checking for microphonic tubes
As tubes wear, some problems can come up. One of the most common symptoms is a ringing sound.
This is usually due to the tube becoming microphonic (like its name suggests, it’s picking up sound and
amplifying it).
With the amp unplugged and cooled off, examine the tubes to make sure they’re in tight and straight.
Never twist them! Gently grasp the tube and wiggle it into place. Because some of the tubes are inside
of metal sleeves, you will have to remove the sleeves to check them for microphonics. Grasp the sleeve
with your fingers and depress it (it’s spring-loaded) and turn to the left (counterclockwise). Now pull it
off; this may require a little wiggling action.
V6
V7
V1
V2 V3
V4
V5
V8 V9
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