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Rivera 9000-0011-0037, Руководство пользователя

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3. Check the Standby switch. 
4. If an effect or signal processor is plugged into the Effects Loop, make sure it’s turned on and that 
the level controls on the amp and processor are set correctly. 
5. Check the speaker cable or cables to see if they are disconnected or shorted. 
6. Check for blown speakers. 
7. If a fuse is blown, replace it (if it blows again, refer your amp to qualified service personnel). 

The amp shuts down unexpectedly 

1. Follow the seven steps in the “There’s no sound” section. 
2. Turn off the amp and wait 25 minutes before turning it on again. An internal thermal protection 
circuit can shut the amp down if it becomes overheated. 
3. After 25 minutes, turn it on, and if it shuts down again, refer the amp to qualified service 
personnel. 

Note: 

On SEMKO 230-volt models, there is one additional T 8A (250 Volt Slo-Blo type, 5mm x 

20mm) 
fuse and two T 1A (250 Volt Slo-Blo type, 5mm x 20mm) fuses located internally. These should 
only be 
replaced by qualified service personnel. 

There’s unwanted distortion 

1. Check the speaker. 
2. Check the cables. 
3. Check the signal level at other devices in the signal path. 
4. One or more tubes may be bad (refer to the tube information on page 24, or take your amp to 
qualified 
service personnel). 

B 

I A S 

A

D J U S T M E N T 

Caution! 

There are no user-serviceable parts inside your Sedona Amplifier. 

The following information is intended for qualified technical personnel 

only

. Do not remove 

the Sedona Chassis from its cabinet, as high-voltage shock hazard exists inside this chassis. 
Internal to the Sedona and located on the main PC board is a potentiometer for adjusting the bias. 
The DC idle current can be measured between Pin 8 of the EL-34 tubes and the chassis ground. The 
cathodes of the EL-34s are wired together and are switched by an isolated standby switch located in 
the #1 speaker jack labeled “Speakers.” 

Bias Test Procedure: 

Start by connecting a DC milliampere meter (most analog and digital volt 

meters have this feature) between Pin 8 of the EL-34s and ground. With nothing plugged into 
speaker jack #1, and an 8-ohm load connected into speaker jack #2, turn on the amplifier, and do 
not insert a signal. 
The DC Idle current should be set between 75 and 90 milliamperes for the pair of EL-34s. 
Use a small screwdriver to turn the potentiometer on the main PC board, which raises or lowers the 
idle current. If the tubes are set with excessive bias (low idle current), the sound will be gritty and 
cold. If the idle current is set too high (low bias voltage), the EL-34 output tubes will run 
excessively hot, and this will shorten their life considerably. 

T 

U B E 

C 

A R E 

& R 

E P L A C E M E N T 

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 replacements. Here’s a tube chart to show you which tubes go where. 

Содержание 9000-0011-0037

Страница 1: ...O W N E R S M A N U A L NEW SEDONA LITE ...

Страница 2: ...settling for second best This requires dedication to you the guitarist and a belief that an amp is more than a collection of parts It s part of your sound Please fill in the following information for future reference Model Name Sedona Serial Number Dealer s Name Dealer s Address Date of Purchase PA C K I N G INFORMAT I O N Unpacking Before you plug in inspect your Sedona amp for any damage Your am...

Страница 3: ...the date of purchase with the exception of tubes which carry a 60 day warranty and loudspeaker drivers which are covered for 90 days The warranty period commences on the date of purchase by the original user Performance under this warranty must be obtained at one of the following a RIVERA Authorized Service Station by returning the unit to the RIVERA factory with prior authorization or in countrie...

Страница 4: ...ranty gives you specific legal rights You may have other rights that vary from state to state NO T I M E T O R E A D T H I S MA N U A L AT L E A S T R E A D T H I S PA G E NOW Before you plug in Take a quick look inside the back of your amp Make sure of the following 1 The tubes are securely seated in their sockets see page 24 for further information on checking for loose tubes 2 The internal spea...

Страница 5: ...th TRS to TRS cable F R O N T PA N E L Channel 1 Bal Unbal input This features a balanced or unbalanced input depending on the cable or instrument you use If your instrument has a balanced output like most Taylors with the Expression System then you ll want to use a TRS to TRS cable tip ring sleeve or also called stereo cable You can also use Channel 1 for a Mic Use a XLR to TRS cable when using a...

Страница 6: ... too extreme when the control is pulled try setting the treble control to a lower number and the Pull Bright switch off and compare this tone to what you get with the treble control at a higher setting Note Refer to the section on the Presence control for an explanation of its relationship to adding brightness Middle with Pull Notch switch The midrange circuit has a slight notch in the frequency s...

Страница 7: ...ddle with Pull Notch switch The midrange circuit has a slight notch in the frequency spectrum at about 550 Hz and turning the knob alters that notch s depth Its Pull Notch switch shifts the notch s frequency center down to about 250 Hz For reference most 1950s tweed amps have their notch centered at 550 Hz while classic blackface amps have theirs centered at 250 Hz Large bodied acoustic instrument...

Страница 8: ...ting this control adjusts the level of cut or dip with 1 providing the minimum cut and 10 providing the maximum cut Anti Feedback Frequency Control Rotating this control with the Anti Feedback equalizer engaged continuously sweeps the different center frequencies of the cut or dip The knob setting of 1 corresponds to the narrowest range 150 Hz and 10 correspond to the widest range 3 5 kHz PRACTICA...

Страница 9: ...d and that the power cord is firmly plugged into the amp and the outlet R E A R PA N E L Mains Input Your Sedona has a detachable power cord that connects to the chassis AC connector labeled Mains Input Always use this cord and in the event that the power cord requires replacement replace it with the same type of power cord Consult your RIVERA dealer for further information Be sure to use a ground...

Страница 10: ...ng of this fuse is a clear indicator of a defective output tube Always use the correct fuse value when replacing the HT Fuse If the Mains Fuse or the HT Fuse repeatedly blows refer your amp to your local RIVERA dealer or contact us at 818 767 4600 or support rivera com for further service assistance Speaker outputs Two 1 4 Speaker Output phone jacks are provided The first is for the Celestion G12T...

Страница 11: ...h 3 Set the amp s Effects Loop Send Level and the signal processor s input level so that you don t overload the processor Keep your ears open for unwanted distortion from the signal processor you ll know it by its crackly unmusical sound Whack a few chords on your guitar to check that your settings are correct 4 Now turn up the Effects Loop Return knob until the proper volume and overdrive are dia...

Страница 12: ...tput jack labeled Speaker 1 with a Y cable and reconnect the internal Jack and a the Speaker cord to the speaker input on an extension cabinet with an 8 ohm impedance and power handling capacity of at least 55 watts Don t use a 16 ohm extension speaker Driving a full range Sedona extension speaker cabinet Using a Y cord connect the Speaker 1 with the internal jack and speaker cable into the Full r...

Страница 13: ... use its Send jack instead of the Line Out The Send Level knob then acts as a variable output level 9876 543 21 __10 987 6543 21 _ _109 876 5432 1 7654 32 1 Placing a signal processor in the effects loop Using shielded cords connect the Effects Loop Send to the processor s input and the processor s output to the Effects Loop Return Adjust the mixture of effect non effect sounds at the signal proce...

Страница 14: ...nal processor to the first Sedona s Effects Loop Return Set the first Sedona s Effects Send and Return levels and the signal processor s input and output levels for best signal to noise ratio and best tone In addition set your effects dry signal blend in the signal processor If you want to use a volume pedal the line between the first Sedona s Effects Loop Send and the signal processor s input is ...

Страница 15: ...e a little wiggling action Remember to put the sleeve back on after you check the tube Make sure the power cord is tightly plugged in This is critical at both ends of the cord And don t use one of those 3 pin to 2 pin adapters unless you connect the ground lug to the outlet Leaving the ground disconnected isn t just cheating it s dangerous to unground any electrical device that s supposed to be gr...

Страница 16: ...om its cabinet as high voltage shock hazard exists inside this chassis Internal to the Sedona and located on the main PC board is a potentiometer for adjusting the bias The DC idle current can be measured between Pin 8 of the EL 34 tubes and the chassis ground The cathodes of the EL 34s are wired together and are switched by an isolated standby switch located in the 1 speaker jack labeled Speakers...

Страница 17: ... 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 1 Preamp tube first aid If you hear ringing a feedback like high pitched sound in your amp it s probably coming from a pr...

Страница 18: ... or the tube glows cherry red indicating an internal short you ve found the bad tube Turn off the amp immediately If the fuse doesn t blow replace the second tube and turn the amp on again 3 When the tubes have cooled remove them Replace both tubes Don t throw away the good tube from the old pair though save it as a spare Testing a preamp tube Tap gently and listen for ringing Grip the tube firmly...

Страница 19: ...lts AC 50 60 Hz North America or 230VAC 50 Hz CE Nemko model 250 VAC 50 Hz UK Australia New Zealand and South Africa or 100 VAC 50 60 Hz Japan Only Speaker system 12 Celestion G12T 75 8 ohm high power dome tweeter Speaker System power handling 75 Watts RMS Crossover Network 12 dB octave air core inductor Crossover frequency 4kHz Reverb Type Accutronics Spring Height 18 Width 20 75 Depth 12 Weight ...

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