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Here is a G-K classic. The 400RB is vintage 1989-92 bass head that can be rackmounted or used stand alone. It's rated at 200 watts and famed for it's tone. Developed for low wattage applications and beloved by jazz players. This has come from a working studio and was cared for, serviced regularly and stored correctly. It has been throughly tested and is in full working order.

I had forgotten what a great amplifier the Gallien-Krueger 400RB is.

Gallien-Krueger was started by a couple of HP engineers back in the early 1970s and became one of the most popular bass amplifier manufacturers in the world.

They were pioneers in lightweight high-power solid state amplification. Their first iteration of the 400RB was introduced in 1982 as a scaled-down version of their 800RB amplifier.

These amplifiers were hugely popular back in the day, and are still seen regularly at gigs. They are reliable, loud and sound very nice.

This 400RB amplifier weighs in around 15 pounds, and measures approximately 17.5" wide by 4" high by 9.5" deep. You can mount it in a standard size rack if you replace the amplifier end caps with rack ears. For its weight the power output is good, with 200 watts at 4 ohms.

The 400RB is a classic-looking amp, with a crinkly-finished metal case. There is a handle mounted to one end of the case in case you decide not to go with a rack case. The front is uncluttered, with a neat line of controls. There is one ¼” input jack (a 10db cut switch is included) and a volume control. Tone controls include 3 filter switches (low cut, mid cut and high boost), and a 4-band equalizer. On the output side there is also an adjustable footswitch-controllable boost circuit with its own input jack and a master volume knob.

The back of the case is very simple with a direct out, an effects loop and two ¼” speaker outs.

I opened this one up to see what was inside. The wiring is tidy and nicely routed, and there is a huge transformer. Gallien-Krueger eschewed a cooling fan and went with a great big heat sink on the back of the chassis instead.

Through my Ampeg cabinet (with an EV 115L) or my Genz 12-inch cabinets the 400RB amplifier is amazingly loud for 200 watts. It has a very smooth tone and has a lot of character that I do not usually associate with older solid-state amplifiers. It also has great lows and low-mids.

The original Series I amplifiers required a footswitch for the boost function to work and had a permanently attached power cord.

The Series II was the same amplifier, except the boost worked without a footswitch (a footswitch could still be used, though), and it had a detachable IEC power cord.

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Listed10 months ago
ConditionVery Good (Used)
Very Good items may show a few slight marks or scratches but are fully functional and in overall great shape.Learn more
Brand
Model
  • 400RB Series II
Finish
  • Metal
Categories
Year
  • 1989-92
Made In
  • United States

Product safety information may be available here.

Music Man L.A.M.F.

Saint John, Canada
Joined Reverb:2022

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