MIX Online Review: Retro Instruments Revolver

Dual-Channel Tube Compressor Recalls the Vintage Audio Gear of Yesteryear

Barry Rudolph
Jun 11, 2018

The original Altec 436C was a three-tube circuit. Revolver uses a solid-state sidechain circuit to replace the 6AL5 tube detector used in the Altec, though it retains the same 6BC8 input and 6CG7 output tubes. There are many dual triode tubes that can be substituted, as Retro has a vast NOS supply of American-made tubes (primarily because they were popular television tubes).

The rear panel of Revolver mimics the Altec with horizontally mounted tubes and transformers for proper cooling. The four tubes (two for each channel) are located between and protected by two taller custom output transformers located inside of steel box shields. The output transformers’ laminated cores are oriented 90-degrees from the core of the custom AC power transformer. Part of Revolver’s sonic “secret sauce” revealed to me is that…

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