Bass; Reverb - Mesa/Boogie TransAtlantic TA-30 Owner's Manual

FRONT PANEL: Controls & Features
Very high settings of the TREBLE control will increase the likelihood of microphonic tubes to start making noise and begin ringing or
feeding back. It just adds too much top end into the signal path early and this is then amplified again and again making any sensitive
tubes show their weaker side. This will be most critical in TOP BOOST in Channel 1 and both HI 1 and HI 2 in Channel 2 where the
higher gain present will put more scrutiny on the preamp tubes.
In the TOP BOOST Mode of Channel 1 and the HI 1 Mode of Channel 2 you may find that the TREBLE wants to be set a bit lower
than in some of the other modes and it is not uncommon to find it set below11:00 for many great sounds... especially solo tones.

BASS:

The BASS is probably the simplest control on the TA-30 and it simply dials in low frequencies to the mix in the preamp sec-
tion. It is a less "volatile" Tone control than the TREBLE in that high settings will only cause an unbalanced sound, and not some other
"stress" issue on the tubes. There is not really even a danger in speaker damage due to extreme settings as there
might be in some higher power amps - as the power available in the TA-30 is not usually considered high enough
to be dangerous to most speakers with the exception of possibly the most extreme volume settings in the 40 watt
Power Mode with low wattage speakers.
Really, the main thing to keep in mind regarding the setting of the BASS control is to avoid dialing in too much and
15
PULL
BASS CUT / MASTER
creating a flubby sound with compromised attack characteristics. Remember the old rule we mentioned earlier in
the HELPFUL HINTS section... as the GAIN goes up the BASS should come down. While this is pretty general and
maybe too all-encompassing, keeping it in mind will help you get to a great sound faster.
It is especially important not to run the BASS too high when searching for clipped sounds in the NORMAL (and sometimes TOP
BOOST) Mode of Channel 1 and the TWEED Mode of Channel 2. When the GAIN is maxed out here things can get kind of ugly in
CAUTION!
the low end fast.
TUBE GUIDE T
4 x 12AX7
A T A
LL UBE MPLIFIER
2 x EL 84
CAUTION: CHASSIS SURFACE MAY BE HOT!

REVERB:

This rotary pot controls the mix of the REVERB effect and allows you to dial in the perfect amount of sweet, all-tube,
analog spring Reverb. This control will only affect the sound when the REVERB circuit is switched into the signal path by taking both
the REVERB and EFFECTS LOOP out of the BYPASS Mode. To activate the REVERB and the EFFECTS LOOP,
select FX & REV on each Channel's REV/LOOP mini-toggle just to the left and right of the center cluster of Preamp
FX & REV
and Power switches.
Any amount of the Reverb effect can be dialed in here... from a faint, ambient background embellishment all the way
up to a fully drenched "surf" effect where the notes swirl in a cavernous wash of ringing harmonics.
REVERB
There is a REVERB BYPASS jack on the Rear Panel (Bottom Rear Of Combo Chassis) that accepts a standard ¼ "
phono plug and by connecting a simple tip-to-ground type latching switch to this jack the REVERB can be triggered on and off. The
EFFECTS LOOP must still be in the circuit for the REVERB to work and triggering this REVERB jack with the FX & REV switch in
BYPASS will not turn the REVERB On.
NOTE: REVERB Footswitches are available through your local MESA/Boogie Dealer or if you live too far from one, from us directly.
NOTE: USE ONLY SHIELDED CABLE FOR THE REVERB BYPASS FOOTSWITCH.
NORMAL TWEED
HI 1
TOP BST HI 2
25W 25W
FT
SW
15
GAIN
5W 5W
WARNING!
A
RANS TLANTIC
H
® ANDBUILT IN
TA-15
(Continued)
-15
TREBLE BASS
PATENTED
6,621,907
7,173,488
8 OHM
P , CA
ETALUMA
7,602,927
PAGE 9
™
ON
POWER
STANDBY
ON
MASTER
SPEAKERS
4 OHM