Is the 1/4” line out jack an unbalanced TS or balanced TRS?

Manual says the 1/4" Line Out is Unbalanced. You can find the manual here: http://ampeg.com/pdf/manuals/SCR-DI_OM.pdf I hope this helps.

Is the 1/8 inch aux input a stereo input? Do you hear the track in stereo in your headphones?

Yes. It’s perfect for practicing to music.

Does it come with a 9V adaptor?....If not , which one do you buy?

9V ~500mA (or even Less) I use PigHog 9V 1A for all my chain and it works.

Headphone output is pushing out the connector (i’m getting no sound). when i introduce the connector half way it works, but is loose. is this normal?

Send it back get you another one

Scr Di Preamp Pedal | Desertcart UK

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Description

🎸 Own the stage with Ampeg’s legendary grit and pro-level tone control!

BUILT TO GIG HARD - Durable metal switches, no-slip rubber feet, and a tough zinc chassis mean this pedal survives every tour and rehearsal.
PRO GRADE CONNECTIVITY - XLR balanced output with ground lift ensures pristine FOH delivery, plus dual 1/4" outputs for flexible rig integration.
ULTIMATE TONE SCULPTING - Classic Ampeg EQ with Ultra-Hi and Ultra-Lo controls lets you craft massive, stage-ready bass presence.
BASS SCRAMBLER OVERDRIVE - Inject authentic SVT grit and tube-like sag for that unmistakable growl that commands attention.
ICONIC AMPEG TONE PALETTE - From smooth Portaflex warmth to gritty SVT overdrive, dial your signature sound with precision.

The Ampeg SCR-DI Preamp Pedal delivers authentic Ampeg bass tones ranging from smooth Portaflex to harmonically rich SVT overdrive. Featuring a classic EQ with Ultra-Hi/Ultra-Lo controls, a new Bass Scrambler overdrive, and professional XLR balanced output with ground lift, it ensures your tone is front-of-house ready. Built with a rugged die-cast zinc chassis and metal switches, it’s designed for reliable stage performance and versatile practice with headphone and aux inputs.

Specifications

Product Dimensions	13.11 x 24.38 x 7.49 cm; 1.13 kg
Batteries	1 9V batteries required.
Item model number	SCR-DI
Colour	Black
Compatible Devices	Double Bass
Connector	6.35mm Jack
Hardware Interface	mini HDMI
Signal Format	Analog
Material Type	Metal
Power Source	Corded Electric
Voltage	9 Volts
Item Weight	1.13 kg

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SCR-DI Preamp Pedal

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