Is the +/- in the right place for Boss? Will be using to jump from chromatic tuner and 7 band e.q. to other pedals.

Yes , unless they are reversed polarity , if they are they would be labeled as such , almost all guitar effect pedals and tuners are center pin negative / outer barrel positive, 5.5 mm barrel connector type However ,there are a few exceptions . Check with boss and donner for your application

Will work with the Dunlap DC power brick?

It should. I have voodoo labs one but I think all of the 9v pedals have the same size jack and these cords are same on both ends. So I don’t see why Dunlop would have a different size especially with same voltage. So yes

Will these handle 300ma pedals or will all chaos and mayhem ensue?

Yes, these 60CM Guitar Pedal Power Cable Cord could handle 300ma pedals and they won't make all chaos and mayhem ensue. Hope the above helps.

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Donner Guitar Pedal Power DC Cable, 60 CM Effect Power Supply Cord - 10 Pack, Male to Male

Donner Guitar Pedal Power DC Cable, 60 CM Effect Power Supply Cord - 10 Pack, Male to Male

Product ID: 56850325

Details

Brand
Donner
Color
Black
Connector Gender
Male-to-Male
Plug Format
Type A
Voltage
9

⚡21AWG high-quality copper wire

🔌10-pack stable power cables

↩️Right angle + straight jack combo

€ 28.86

Duties & taxes included

In stock

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Description

🎸 Power Up Your Pedalboard, Power Up Your Performance

PREMIUM COPPER CORE - Built with 21AWG high-quality copper wire for superior conductivity and minimal signal loss—because your tone deserves the best.
SMART CONNECTOR DESIGN - Each cable features one right-angle and one straight jack, optimizing space and reducing cable clutter on your pedalboard.
READY FOR GIGGING STUDIO - Durable polyvinyl casing and robust build quality make these cables perfect for both indoor and outdoor use—never miss a beat.
UNIVERSAL FIT FOR 9 V PEDALS - Standard 5.5mm x 2.1mm connectors with negative center polarity, compatible with most guitar effect pedals on the market.
POWER YOUR PEDALS LIKE A PRO - 10-pack of 60cm male-to-male DC cables ensures uninterrupted, reliable power flow for your entire pedalboard setup.

Donner’s 10-pack of 60cm male-to-male DC power cables delivers stable 9V power with premium 21AWG copper wiring and a smart right-angle plus straight jack design, ensuring reliable connectivity and space-saving setup for guitar effect pedals. Trusted by thousands with a 4.8-star rating, these cables are built to perform in both studio and live environments.

Specifications

ASIN	B078XRM3W4
Best Sellers Rank	#5,033 in Musical Instruments ( See Top 100 in Musical Instruments ) #121 in Instrument Cables
Brand	Donner
Case Material Type	Polyvinyl
Color	Black
Connector Gender	Male-to-Male
Customer Reviews	4.8 4.8 out of 5 stars (807)
Ethernet Cable Category	Cat 5
Gauge	21
Indoor Outdoor Usage	Indoor, Outdoor
Item Length	23.6 inches
Item Weight	0.24 kg
Manufacturer	Donner
Mfr Part Number	EC1049
Model Number	10-pack power cord
Number Of Conductors	1
Number of Outlets	1
Plug Type	Type A
Power Cord Prong Count	2
Unit Count	10 Count
Voltage	9 volts_of_direct_current
Wattage	21 watts

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