ALT-436C
by Antelope Audio · Compressor · Vari-mu tube compressor
Not rated yet
ALT-436C models a late-1950s single-channel vari-mu tube compressor, the third revision of the 436 design.
It offers up to 30 dB of thump-free gain reduction for vocals, bass and the mix bus, and lists at $149 (on sale for $19.90 at KVR).
Best for: Vocals, Bass, Mix Bus. Genres: Rock & Indie, Pop, R&B & Soul, Jazz, Acoustic & Classical.
Keywords: vari-mu, tube, bass, bus processing, vocals, mix bus, 50s, glue, hardware emulation, vintage, mixing, full mix, minimal controls, simple, single-band, strings, subscription, synths, thin.
What it does
ALT-436C is Antelope Audio's model of a late-1950s vari-mu tube compressor, the third revision of the 436 design. It is kept deliberately simple, with a threshold, a release time and a fixed attack, and is pitched at vocals, bass and bus work.
- Vari-mu tube design: gain reduction comes from a modelled tube stage, as in the original, rather than an opto cell or VCA.
- Threshold and Release: the two main controls; attack is fixed, as on the hardware, so setup is quick.
- Up to 30 dB of gain reduction: the developer says it stays "thump-free" even when pushed hard.
- Level control: holds the reproduced level steady while keeping the dynamic range, and is designed to stop peaks overmodulating.
- Uses: the developer lists bass guitar, vocals, strings and synths, and it is also pitched at the mix bus.
- runs in a DAW on its own, with no Antelope hardware needed; a Synergy Core version also runs in real time on compatible Antelope interfaces.
Version 1.0.3 is listed on KVR. It is also part of the Antelope Cosmos subscription, which bundles more than 75 Antelope native plugins.
Source: Antelope Audio product page
When to use it
ALT-436C is the pick when you want a plain vintage vari-mu with almost nothing to set, at a very low sale price. Compared with the Teletronix LA-2A Leveler Collection or CLA-2A, it uses tube gain reduction rather than an opto cell, and it gives you a release control those levelers lack. MJUC offers several vari-mu flavours plus timing and drive controls in one plugin, so it is the more flexible tube compressor; ALT-436C models one unit with fixed attack. Next to Pro-C 3 or The Glue it has no sidechain filter, mix knob or metering extras. Within Antelope's own range it is the gentler choice than BA-6A, which is voiced for grit and hard-knee limiting.
- Best for: smoothing vocals and bass, lifting a track forward with a few dB of gain reduction, and gentle glue on a mix bus.
- Genres: rock, pop, soul and jazz, or anything that wants vintage tube colour.
- Look elsewhere if: you need fast peak control, a parallel mix or sidechain filtering; Pro-C 3 is more flexible, and MJUC gives more vari-mu options.
- Tip: one reviewer found small amounts of gain reduction were enough to bring tracks to the front of a mix.
What producers say
Feedback is thin but positive on sound and value, with a wish for more presets.
- Mixing.co.kr (2024, Antelope native series review) described it as a vari-mu emulating the Altec 436 and found it useful "for bringing tracks to the forefront" with light gain reduction.
- KVR users rated it 3 out of 5 from 1 review (version 1.0.3, Windows, 2026); the reviewer said "it does what expected for that price" at the sale price.
- Criticisms: the KVR reviewer asked for more presets as starting points; the 2024 review criticised the then subscription-only licensing, though the plugin is now also sold on its own.
Where to buy
- Best Service: $19.90
- KVR Marketplace: $19.90 (regular $149)
- PluginFox: $19.90 (regular $149)
- AudioDeluxe: $19.90 (regular $149)
- Plugin Boutique: $149
- Antelope Audio: see store
Tutorials and reviews
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