Demeter Amplification TGA 2.1 User manual

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TGA 2.1 GUITAR AMP : USER GUIDE
by Demeter Amplication

Demeter Amplication | TGA-2.1 User Guide
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e Demeter TGA 2.1 Guitar Amplier
Congratulations! You have purchased James Demeter’s latest advance, the TGA-2.1 Inverter. is meticulously hand-
built amplier features the latest in Retro/Modern tube amplier design, the latest evolution in the Demeter series of
rugged, roadworthy professional products. e TGA-2.1 is extremely versatile, with more usable tones than you will
nd anywhere. Hook up, plug in, and enjoy!
Please read this manual and check out the logical control layout. Familiarize yourself with the Gain structures of the
CLEAN, EDGE, and SOLO settings. You will easily nd many sweet spots, both pure and hybrid tones. is is an
important dierence between the TGA-2.1 and most other amps. It doesn’t have only one sweet spot, but a wide
range of really alive sounds.
Safety Precautions:
1. Do not use the unit in excessively moist environments.
2. Although not required, it is recommended to leave 1 rack space above the unit to allow for proper ventilation
and to elongate the life of the tubes.
3. is unit is equipped with a grounding plug as a safety feature. Please do not remove the ground on the unit. If
you are experiencing noise in the signal, try lifting the ground on the signal source.
4. DO NOT OPERATE UNIT without making sure that a speaker (load) is connected to it. If you have a TGA-
2.1 COMBO amp, the speaker(s)will come connected, but it is a good idea to check anyway. A tube amp can
burn out its output transformer (an expensive repair) if operated without being connected to a speaker.
5. If you want to use your favorite 4x12cab, make sure you match your speakers’ IMPEDANCE (see appendix)
to the speaker jack on the BACK PANEL of the TGA-2.1. ere are 3 speaker output jacks, 4,8, and 16
OHMS
6. If this is the rst time it is powered up, don’t plug in your instrument yet. is is a LOUD amp, so check your
FRONT PANEL controls and zero out your gains and master volume rst.
Package Contents:
is package should contain-
• TGA 2.1 Guitar Amplier
• FS-2 Footswitch
• IEC Power Cable
Warranty:
e TGA 2.1 Guitar Amplier is covered for 1 year parts and labor.

Demeter Amplication | TGA-2.1 User Guide
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Output Impedance 4 Ω, 8 Ω, 16 Ω
Tubes 4-12AX7 (preamp) 2-6L6 (power)
Inputs 1/4” TS Hi-Z
Output Wattage Depends on model, Triode mode = 50% power.
Weight 23 lbs
Operating Voltage 117 Volts or 240 Volts
Dimensions 24” x 9.5” x 9”
Notes on use:
e TGA-2.1 works like three ampliers in one, but it’s important to note that the amp does this with 2 channels,
eliminating the need for redundant controls, which makes dialing in your tone a snap. e TGA-2.1 is a two-
channel amplier, with two VARIATIONS of the second channel. Each option has its own tonal character.
CLEAN, EDGE, and SOLO are obvious references, but there is sucient range built in to exceed those limits.
(Try cranking the Gain on the CLEAN channel for edgy, glass shattering lead tones like a Tweed Deluxe.)
e CLEAN channel is very clean, especially in BRIGHT mode (CLEAN GAIN knob pulled out.) As GAIN goes
higher, the tone gets more pick/hand sensitive, and more edgy.
e EDGE setting (channel two) starts where the CLEAN channel leaves o. It’s a bit more compressed, and the
dirt is trebly …think Marshall Plexi. In BOOST mode (pull the EDGE GAIN knob) it has at least as much gain
as the SOLO setting, but is voiced dierently. It’s a fuller sound, more sensitivity, great for R & B and Funk.
e SOLO channel is bigger, gainier sounding, more of a roar.
Specications:

Demeter Amplication | TGA-2.1 User Guide
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Demeter Amplication | TGA-2.1 User Guide
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Front Panel Operation
• Power/Standby Operation : When powering up any good tube amplier, the POWER SWITCH should
be engaged FIRST (pilot lights up) to warm up the power tubes. is is known as STANDBY mode. By
letting power tubes warm up gradually, they last longer (more on power tubes later.) Wait anywhere from
1 to 10 minutes before turning o STANDBY (in the tradition of early Fender amps, STANDBY mode is
when power is ON and the STANDBY SWITCH is in the opposite direction from the POWER switch.
To turn the amp the rest of the way on, throw the STANDBY switch so it’s in the same direction as the
POWER switch.)
• Return & Send Controls : SEND controls the level of signal coming from the PREAMP section and into
your eects. (If no eects are connected to the EFFECTS LOOP, SEND and RETURN controls have no ef-
fect.)e output of your eect or eects chain goes to the RETURN jack (back panel) and the eect output
level is controlled by the RETURN knob. is patch point puts ambient eects (reverb, ange, delay, etc.)
where they will sound best – after the PREAMP and before the POWER AMP (see appendix.)
• Presence Control : Feeds inverted signal back into the main signal path, reinforcing certain frequencies.
It adds a subtle, glistening quality to the tone. is control makes a small amount of static-like noise when
rotated – this is normal. PRESENCE tends to brighten the signal – for a darker tone, turn this DOWN.
• Bass, Middle and Treble Controls : In common with most modern and many vintage guitar amps, these
controls GLOBALLY shape the TGA-2.1’s tone, which means they are interactive. (For example, play high
notes while turning the BASS knob. Try the same thing with both low and high notes while turning the
MIDDLE knob.) Shaping your tone is a subtle balance among all FOUR tone controls, along with GAIN,
MASTER, and the PENTODE/TRIODE switch. e tone controls are shared between the 2 channels
and all settings. ey are cut-and-boost type controls. Center position (5) is essentially at; turning up
(toward10) boosts that frequency band. Conversely, turning a control down cuts that control’s level. First,
rough in your tone, then ne tune it.
• Master Control (Channel 2) : is controls both EDGE and SOLO channel gain, ‘roughing-in’ the output
level. is also has a pull-switch on the knob, which engages a tube-driven version of Demeter’s famous Fat
Control, providing a midrange boost (makes single-coils sound like humbuckers.)
• Solo Gain (Channel 2) : Controls the gain of the solo channel.
• Edge Gain (Channel 2) : Controls the gain of the edge channel.
• Master Control (Channel 1) : Channel 1 has a glassy, shimmering range of tones, from sparkling clean with
lots of headroom, to very Tweedy, with dynamic response like vintage Fender amps and early un-modied
Marshalls. In TRIODE mode, the sound gets even more ‘vintage.’
• Clean Gain (Channel 1) : Controls the gain of the clean channel. is control also has a pullout BRIGHT
switch, for even more classic spank.
• Input : at’s right, you guessed it : this is where your instrument plugs in.
• Channel Switch : Switches channels manually. (IMPORTANT!): THIS SWITCH MUST BE IN THE
CENTER POSITION TO USE THE FS-2 FOOTSWITCH.

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RearPanelOperation
• FS-2 Footswitch Jack : is is a TRS (Tip-Ring-Sleeve) type jack. Any 3-conductor cable with 1/4” TRS jacks will
work for longer runs (e.g. unshielded headphone extension cable.)
• Eects Loop Send/Return : SEND comes from the preamp of TGA-2.1 and goes to the input of your eects chain.
e output of the last eect goes into the RETURN jack.
• Pentode/Triode Switch : THIS SWITCH SHOULD ONLY BE THROWN IN STANDBY MODE. It eectively cuts
the power by approx. 50%, changes the basic character of the amp, decreases the headroom, but INCREASES pick/
hand sensitivity.
• Amplier Output (16 ohm, 8 ohm, 4 ohm) : MAKE SURE THAT A SPEAKER IS CONNECTED BEFORE TURN-
ING ON THE AMPLIFIER. ese separate outputs run dierent impedance speaker cabinets. Only one speaker
output should be used at a time.
• Fuse :
-For 110 VAC : 50 watt amp uses a 2 amp slow blow fuse, 100 watt version uses a 4 amp slow blow fuse.
 -For240VAC:50 watt amp uses a 1 amp slow blow fuse, 100 watt version uses a 2 amp slow blow fuse.
• Voltage Selector : Switches between 110VAC and 240VAC for international operation. Make sure to replace fuse
when changing voltage.

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FS-2FootswitchOperation
e FS-2 Footswitch (included w/TGA- 2.1) selects any of the 3 major sections of the amp (clean, edge or solo).
• Left footswitch : Toggles between Channel 1 (clean) and Channel 2 (edge/solo)
• Right footswitch : Toggles between edge and solo when Channel 2 is engaged (has no eect when clean channel
is selected).

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Troubleshooting:
• No Sound : TURN UNIT OFF IMMEDIATELY. Ensure that speaker is connected to rear speaker output, and
the speaker cable is not shorted out. Make sure speaker impedance is correctly matched to the output. Check all
other cables & connections, if light is o, check the fuse. If still no sound, try replacing your preamp tubes, one
at a time. If a power amp tube fails, send the unit in for repair, as the unit needs to be re-biased.
• Scratchy/Microphonic Sound : Try replacing the tube closest to the input jack (12Ax7)
Support:
Feel free to call or email us for additional support or product repairs. We are available M-F 11am-4pm Pacic
Standard Time.
Phone : [phone]
Email : [email protected]
Website : www.demeteramps.com
Copyright:
© 2012 Demeter Amplication. All rights reserved.
is manual and any associated products or designs are subject to copyright protection. No part of this document
may be reproduced, in any form, without prior written permission of Demeter Amplication.