g) Footswitch
Your amp comes with a 3 button footswitch, (Note: in the past 2 button footswitches were used for "older"
non-Reverb Models, see below for info). One button is for switching between the two channels, one for
engaging the boost on channel 1&2 and one for the reverb option if applicable. The footswitch jacks are
located on the back panel. The top one is labeled reverb, the bottom one channel/boost. The older 2
button "non-Reverb" footswitch has one stereo (ring, ring, and tip) ¼" plug which goes in the
channel/boost jack. The 3 button footswitch has a second plug, a mono ¼" plug (ring and tip), which goes
into the reverb jack. If you don't know the difference between mono and stereo plugs look at them and
you will notice the difference (Mono = tip, ring and Stereo = tip, ring, ring). Current Shiva’s have a 4-
position rotary switch on the right-side back panel. This rotary switch is only active when the footswitch is
not plugged in. This rotary switch allows you to activate either: Position 1 = channel one or Position 2 =
channel two or position 1+ = channel one with boost engaged or Position 2+ = channel two with boost
engaged.
NOTE for older Shiva versions made prior to 12/1/05: On older Shiva’s if you don't connect the
footswitch only the Clean Channel 1 can be accessed, read further below on how to activate the High
Gain channel 2 if not using a footswitch. On reverb models, the reverb is always on if the reverb
footswitch plug isn't connected. NOTE using the "older version" Shiva without the footswitch connected:
Some people may not need to use their footswitch because they only need one channel to play thru. The
Shiva defaults to the Clean channel with the Reverb on when no footswitch is plugged in, however to
activate the High gain channel without using the footswitch you have two options: First option, plug in a
"shorted" mono 1/4" instrument plug, this will give you the High gain channel with the Boost function
engaged as well. Second option: plug in a "shorted" stereo 1/4" instrument plug; this will give you the
High gain channel without the Boost function. Shorted means the tip and sleeve/ground are connected;
using a "right-angle" plug is a good idea also since it has a low profile and will not extend out from the
amp chassis very much. Also you can easily short the 1/4" plug internally, just solder a jumper between
the two contacts.
3. Tubes
EL34's should be only Svetlana or old stock Siemens/Telefunken/Mullard. Other brands may work but it's
risky because of the high plate voltage we use. 6L6 should be Svetlana or Sovtec 5881, we prefer the
first. For preamp tubes you could use everything from 12AX7, 7025, ECC82, ECC83, 12AXWB,
12AX7WA, 12AT7 etc. Sovtek, EI, Electro Harmonix, Chinese, Tesla, GE, Philips, Telefunken, RCA etc.
We prefer the Chinese 12AX7A's.
The Shiva has 6 preamp tubes (7 in reverb model) which do the following:
1st (closest to input jack) > Ch 1+2 > check that one if your amp gets noisy or microphonic.
2nd+3rd > Ch2 only
4th > one part (triode) Ch 1, second part for the loop send (affects both channels)
5th > loop return (affects both channels)
6th (second row in center of chassis) > phase inverter (affects both channels)
7th (second row towards side of chassis) > reverb
Note: If you want to experiment with different tubes the first 3 tubes are the most noticeable ones, sound
wise. The less gain the tube has and the earlier the tube is in the sound chain (1st, 2nd...) the less noisy
your amp is.
Make sure you turn your amp off when you switch tubes and be careful the tubes might be very hot!! Do
not touch tube sockets with fingers? Even after turning your amp off and unplugging it from the power
outlet there could be enough voltage stored in the capacitors to give you a lethal electrical shock.
Read safety instructions again!!
To Next Page
Loading...
