Lars & Ivan THA-21 User manual

THA-21
USER MANUAL
Desktop Headamp
Class A Amplification
Lars & Ivan

Class of operation Class A
DAC via USB connector
Meter indication Deflection meter type for signal monitor
Main voltage 110 and 230V (By selector switch)
Input and Output
connection
2 pairs x RCA, 1 x AUX (3.5mm), 1x micro USB,
1x audio jack (6.3mm), 1 pair x RCA (output)
FEATURES & OPERATING
LINE1 LINE2 AUX USB VOLUME









   




AC socketVoltage
select
Via cable
USB
Aux
Line output
to amplifier
Main unit socket
Impedance selector
Fuse cover
Power switch
Volume controllerRotary switchMeter
Output to connect
to headphone( 6.3mm)
- 1 -

Via cable
Main unit socket 
  USB Aux
Line2Line1
- 2 -
Preparation
Connect AC cord to transformer unit and select correct mains voltage
(110V or 230V) . Product shipped with correct Fuse installed. In case
to replace fuse, please use correct type as marked on fuse cover .
Connect the transformer to main unit socket via cable .
Please allow about 10 minutes after Power up to leave time to
warm up vacuum tube for best performance.
Connect audio cable to your device and THA-21 input USB ,
Aux , Line1 , Line2 . When connecting your music
source to input connections. Remember to select the correct
source from switch on front panel 
to appropriate position.
There is a ground connection for turntable grounding purpose

LINE1 LINE2 AUX USB VOLUME
Output to connect
to headphone( 6.3mm)
LINE1 LINE2 AUX USB

Rotary switch
LINE1 LINE2 AUX USB VOLUME
 Volume
controller
Meter
- 3 -
Connect your earphone to THA-21 6.3mm jack.
Power on
Turn on units power switch on the transformer, the meter
power indicator will light up to indicate is ready to use. For best
performance, please remember to power up unit at least 10
minutes for best performance.
Select music source
You may select "Line1", "Line2" "AUX"
or "USB" by rotary switch 
Please remember to connect your music
source to rear panel accordingly.
Volume level adjust
You may adjust the volume knob to
your desire level. The meter will
provide how strong the signal level and
rhyme deliver to your headphone.
Preparation
Connect AC cord to transformer unit and select correct mains voltage
(110V or 230V) . Product shipped with correct Fuse installed. In case
to replace fuse, please use correct type as marked on fuse cover .
Connect the transformer to main unit socket via cable .
Please allow about 10 minutes after Power up to leave time to
warm up vacuum tube for best performance.
Connect audio cable to your device and THA-21 input USB ,
Aux , Line1 , Line2 . When connecting your music
source to input connections. Remember to select the correct
source from switch on front panel to appropriate position.
There is a ground connection for turntable grounding purpose

SPECIFICATION
Output Power 140mW x 2 (16ΩLoad),
13mW x 2 (300ΩLoad)
Frequency Response 10Hz ~ 25KHz (with load <100Ω)
Headphone Impedance 16Ω~ 300Ω
Signal to Noise Ratio >95dB (A weight)
Stereo Separation >50dB (1mW 16Ω)
Weight 4100g
Size (LxWxH) Amplifier: 214(L) x 155.5mm(W) x 82.5(H)
Transformer: 129(L) x 140.8mm(W) x 82.5(H)
- 4 -
Headphone impedance
You may have several headphone of different impedance. The
impedance commonly in the market is 16 Ω, 32 Ωand some may over
hundred. Our THA-21 caters for different headphone impedance to
provide best performance. You may select the impedance setting from
rear panel ; "L" for 16~30 Ω, "M" for 32~90 Ω and "H" for 100~300 Ω.
Cascade to following amplifier stage
If you wish to make use of the THA-21 Vacuum tube pre-amplifier stage
for your other amplifier. You may use THA-21 output  as tube
amplifier stage for following amplifier stage to your other instrument.

- 5 -
Warranty
In the event of a defect within the warranty time, please contact your
local distributor for warranty service, or contact with Lars-Ivan/ STI
Technology Ltd for details.

- 6 -
Detail of Maintenance
e-mail: [email protected]
Address: 1210, 12/F, Tower A, Hung Hom Commercial Centre
39 Ma Tau Wai Road, Kowloon, Hong Kong
Personal Details
Model:
Where purchased:
Customer name:
Phone:
e-mail:
Address:
Date of purchase:
Please complete the following details and send back to Lars-Ivan/
STI Technology Ltd for 12 months free warranty service.

Lars & Ivan
www.lars-ivan.com
Li-ion
20150722R1