Supro 1685RT Neptune


NEPTUNE– Supro 1685RT

2X12 | 25-WATT

220V EU

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This 25W, 2 x 12 combo amp was created in response to artist and backline requests for a Supro amp with a pair of 12" speakers and spring reverb. Developed in partnership with SIR, the USA's largest backline rental company, the Supro Neptune amplifier is a loud, clear answer to the Fender Twin and Vox AC-30.


Supro 1685RT Neptune Reverb Guitar Combo Amplifier Features:

  • All-tube 2 x 12" combo amplifier with custom Supro speakers
  • Designed to be a gigging workhorse for artists and backline companies
  • 25 watts of Class A power
  • Passive Treble and Bass EQ controls to fine-tune for any guitar/pickup combination
  • Lots of clean front-end headroom, perfect for pedals
  • Ultra-low noise floor, even at cranked levels
  • 4-spring 17" spring reverb
  • Tube-driven tremolo
  • Reverb and tremolo are footswitchable via optional footswitch (sold separately)
  • British-voiced BD12 speakers, wired in parallel at 4 ohms for optimum sonic tenacity

The Neptune's microphone-friendly midrange is largely derived from its vintage-correct, 25W; Class-A power section. It is this unique, "self-biasing" power amp that holds the key to the vintage Supro sound. The Neptune Reverb's remarkably low noise floor makes this amp perfect for live performance at any volume. Even when pushed hard, the Neptune's power section overdrives with a distinctive clarity, leaving plenty of front-end headroom for use with all kinds of stompbox effects.


Passive Treble and Bass EQ controls allow the musician to fine-tune the frequency response of the Neptune's preamp to accommodate a wide range of pickups and varied stage environments. Once the guitar signal has been shaped by the passive tone-stack, it is fed into a 4-spring 17" long reverb tank which uses all-tube drive and recovery stages to provide the richest possible effect. The Neptune also features a tremolo circuit which occurs in the output section, lending an ethereal shake and wobble to the enveloping wash of tube-driven reverb.


The Neptune's wide-body combo cab comes covered in our blue rhino hide tolex and loaded with the British-voiced BD12 drivers that were developed for the award-winning Black Magick amplifier, heard on stages around the world in 2016 with Paul Simon, The Cure, Guns and Roses and Aerosmith. The Neptune's custom Supro speakers are wired in parallel at 4-ohms to deliver a truly visceral on-stage experience that clearly translates through large PA systems and records beautifully in live-broadcast situations.


Tech Specs:

  • Type: Tube
  • Number of Channels: Single
  • Total Power: 25W Class A
  • Speaker Size: 2 x 12" Supro BD12 Black Magick
  • Preamp Tubes: 4 x 12AX7, 1 x 12AT7
  • Power Tubes: 2 x 6973
  • Reverb: Long Spring Reverb
  • Effects: Tube Tremolo
  • EQ: 2-band EQ
  • Inputs: 1 x 1/4"
  • Footswitch I/O: 1/4" (reverb, tremolo)
  • Footswitch Included: No
  • Construction Material: Blue Rhino Hide Tolex
  • Height: 18"
  • Width: 27.87"
  • Depth: 10.5"
  • Weight: 54 lbs.
  • Country of Origin: U.S.A.

With dual 6973 power tubes driving a pair of Supro BD12 Black Magick 12" speakers, the Supro 1685RT Neptune Reverb combo amp is ready to hold its own on any stage.