For 100VAC and 115VAC versions, the HT Fuse is: 1/2 Amp, 250 Volt Slo-Blo type
(3AG, or MDL)
For 230/250 VAC versions, the HT Fuse is: T 500ma (time-delay, 5mm x 20mm size)
Repeated blowing 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) 833-7066 for further service assistance.
Vintage-Modern switch
Switching amongst the two settings will produce a change of output power (from 50watts
in modern to 25watts in vintage) as well as harmonic balance. In Modern mode, the output
power amplifier operates in "Pentode" and will sound the cleanest, have the most
headroom, and sound bright, with odd harmonics (i.e.1,3,5,7, etc.) more noticeable.
Vintage mode brings the output tubes to work in "Triode" mode, halving the power
selected by the High-Low power switch, and lowering the odd harmonics while raising the
even (2,4,6,8, etc.) resulting in a sweeter, darker tone. Do not switch while playing. Best
way is to place the amp on standby first, then switch.
Speaker outputs
A speaker must always be connected to your Venus 5. The amp is designed to deliver at
least 50 watts to a 4-16 ohm speaker load (with the Impedance selector appropriately set to
match the given load). If it has to drive speaker loads lower than 2 ohms, its output
transformer or other components could be damaged. You can use 8- or 16-ohm extension
cabinets, either alone or in pairs (one into each speaker output). A 2-ohm speaker cabinet
alone or a pair of 4-ohm extension speaker cabinets together can be used, however, it is not
an optimum match, and the Impedance Selector Switch must be set at it's lowest setting, 4
ohms. The only time you may run the amp without a speaker connected is if you have a
proper "dummy" impedance load box plugged into the speaker output. Using a dummy
load protects the output transformer, but prolonged use shortens the life of the amp's output
tubes when the amp is operated at high levels.. Just because you cannot hear the amp does
not mean it is not working hard. Always use a heavy-gauge speaker cord. The larger the
diameter of the wire, the lesser of power to be lost. A shielded guitar cord can't handle the
power that your amp provides, and therefore won't sound right--plus it may actually harm
your amp. Refer to the connection diagrams for further information.
Note: Never use a speaker output to connect directly to the input of a mixer, a tape
recorder, a slave amp, or headphones. For further information, refer to the hook-up
diagrams for proper connection with extension speaker cabinets.
Line Output
Your RIVERA Venus 5 amp can drive another RIVERA amp, power amp, or other guitar
amplifier. The Line Out is post-power amp, so every bit of tone from your Preamp, effects
(if used), and power-amp circuitry is sent from this jack. Use a shielded cord connected
between the amp's Line Out and the input of a second amplifier (check that amp's manual--
