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REAR PANEL LAYOUT
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Rear panel features:
4. LOUDSPEAKER jack (mounted underneath the chassis)
5. OUTPUT POWER CONTROL switch
6. BOOST GAIN switch This gives two gain settings for the built-in Brian May boost circuit, namely
7. GUITAR INPUT jack
8. BOOST LINK OUTPUT jack
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16 ohm connection to the internal Celestion G12 Alnico loudspeakers (Two
8 ohm speakers connected in series). If required these can be discon-
nected by removing the speaker jack plug and connecting the amp output
into an extension cabinet of your choice, provided that the cabinet is rated
for a total impedance of 16 ohms and has a power rating of at least 40
watts RMS.
This switch converts the output stage of the AC30 BRIAN MAY CUSTOM
LIMITED EDITION from the full power rating of 30 watts (33 watts actual
clipping) to that of an AC15, which is 15 watts.
The AC30 BRIAN MAY CUSTOM LIMITED EDITION amp has a unique
VOX circuit that does a TRUE & PROPER power reduction, in that it dis-
connects 2 of 4 the output power tubes (or valves). It also adjusts the bias
circuit (as this is a cathode biased amp, it changes the cathode bias resis-
tor), and last, but most importantly, it adjusts the output transformer imped-
ance to the correct value for running only 2 output tubes.
High and Low. The High setting, obviously, gives the maximum gain boost
and is the same as Brian's boost pedal.
The Low setting, which Brian's pedal does not have, but we wanted to add
more flexibility, gives the same treble/mid voicing but has a lower amount
of boost gain.
Although in a rather unconventional position for an input jack, this, as they
say, is where you plug your guitar in!
As always, please use high quality shielded guitar leads for all connec-
tions. NEVER use an un-shielded speaker lead.
This jack allows you to daisy chain the signal from the output of the booster
stage into other amplifiers, delays, or other effects, etc. If using another
AC30 BRIAN MAY CUSTOM LIMITED EDITION, the other end of the link
lead would feed the Guitar Input jack, but do not use the Booster circuit in
the second or further amps. The safest way would be to isolate the boost
circuit by using the Boost ON/OFF switch (9).
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