e) 20
th
Anniversary Model
The 20thA model comes with a pair of KT88’s and the amp is rated at 90 watts. The clean channel has an
entire new boost circuit. Unlike the tone stack bypass boost on the other Shiva model this boost has a
separate gain stage which brings this channel into Plexi territory when boost is engaged. The tone
controls stay in the circuit and affect the sound.
The gain channel features higher gain and a slightly more refined type of gain. Two push button switches
have been added to further shape the tone. The Shift button will as it is labeled shift the EQ., pushed in
you will have a more Fender or type tone, less mids softer feel. One could say it will please the Dumble
favoring players. The Mode button if pushed in will give a more aggressive in your face feel.
A power amp dampening control was added located on the back panel. This control labeled Excursion is
great to dial in a full sound at low volumes or adjust the right balanced bass to a cabinet. Be careful as
this can add massive bottom to your sound which might overpower other frequencies and cover up an
overall balanced sound. Best to keep low at higher volumes.
f) Speaker Outputs
If you put the amp in play make sure you have a load or speaker cabinet hooked up, otherwise you could
damage the output transformer and the power tubes. Let's begin by hooking up a speaker to the new
Speaker 1 "Use First" jack on the back panel of the Shiva. Be sure to set the impedance switch correctly,
use the 16, 8, or 4 ohm setting to match your cabinet. If you're not sure what impedance your cab is, open
the back of the cabinet and call your dealer. There are many ways to wire a speaker cabinet and you
need to know what yours is rated at. To add a second speaker cabinet, use the second speaker jack and
make sure both cabinets have matching impedances, the speaker output jacks are parallel so be sure to
change the impedance selector to "half" the impedance rating of one speaker cabinet. For example: using
two 16 ohm cabinets switch the impedance selector to 8 ohms or to use two 8 ohm cabinets you must
change the selector to 4 ohms. Do not use two 4 ohm cabinets and NEVER EVER use mismatched
speaker impedances. Next, flick the power switch (front panel, right side) to the center "standby" position
and let the amp warm up for several minutes. This will stabilize the circuits and prevent a painful surge
from flashing through your tubes. If you're kind to your amp, it will reward you with grateful reliability.
When ready to play, flick the power switch up to the "play" position.
NOTE for older Shiva’s made prior to 12/1/05: If you put the amp in play make sure you have a load or
speaker cabinet hooked up, otherwise you could damage the output transformer and the power tubes.
This older Shiva does not have an ohm selector; it has 3 speaker output jacks each labeled with an oval
containing 2 numbers in it. One of the numbers in each oval is marked out with a black marker, so only
the other number is important to you! If you hook up only one cabinet, the impedance (ohm value) of amp
and cabinet should match: 4 into 4, 8 into 8 or 16 into 16. If you hook up two cabinets (they must have the
same impedance, same ohm value). The total ohm value is half the value of one cabinet since they run
parallel now: so two 16 ohm cabs plug into the two 8 ohm jacks, two 8 ohm cabs plug into the two 4 ohm
jacks if your amp is wired with two 4 ohm speaker outputs of course, see the following for more details:
The EL 34 Model has one 16 and two 8 ohm speaker outputs (the transformer has an internal 4 ohm tap
also, so the outputs could be wired to 8 4 4 or 16 8 4 ohms if you wanted your amp customized)
NOTE for 6L6 Shiva's made June 2002 and newer are wired with one 16 and two 8 ohm speaker
outputs, just like the EL34 models. Shiva 6L6 models made before June 2002 approx. do not have a 16
ohm tap. The older 6L6 Model have one 8 and two 4 ohm speaker outputs (the transformer has an
internal 2 ohm tap also, so outputs could be wired to 4 2 2 or 8 4 2 ohms if you wanted your amp
customized) Keep that in mind because most of the 4x12" cabinets are 16 ohms.
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