What Retro Instruments Inc. does

Retro Instruments Inc. is a privately held, founder-owned US manufacturer of vintage-style tube recording studio equipment, founded in 2006 by Phil Moore and headquartered in Northern California. The company designs and hand-builds a focused portfolio of tube-based dynamic processors and equalizers that recreate legendary classic circuits — the Sta-Level (Gates, 1956), the 176 Limiting Amplifier (Bill Putnam's UA 176), the REVOLVER (EMI-modified Altec 436), and the 2A3 (Pultec-style passive EQ) — alongside compact 500-series modules (500PRE, DOUBLEWIDE I/II). Core technology is all-tube, transformer-balanced signal paths using Cinemag transformers, variable-mu compression, and discrete Class-A gain stages, with design emphasis on musical compression character and recallable precision controls.

The company's products are sold primarily through a global authorized dealer network spanning 25+ countries, anchored by tier-one US retailers Vintage King Audio and Sweetwater Sound, with direct e-commerce for replacement tubes and parts. Revenue is generated from one-time hardware sales at premium price points (the 500PRE retails at $799; flagship rack units occupy the multi-thousand-dollar tier), a recurring replacement-tube and parts business ($95–$295 per matched tube set), and software licensing through an officially endorsed Kazrog-developed Sta-Level plugin. Customer base consists of professional recording studios, mix/mastering facilities, and individual Grammy-winning producers and engineers who specify Retro gear on major-label recording projects. The company operates with approximately five employees, is bootstrapped with no disclosed institutional investment, and discontinued its POWERSTRIP channel strip and OP-6 portable amplifier to focus the active portfolio.

Name

Retro Instruments Inc.

Legal name

Retro Instruments, Inc.

Website

https://retroinstruments.com

Company type

Private

Founded year

2006

Operating status

Operating

Headcount range

1–10 employees

Short description

Retro Instruments Inc. is a privately held US manufacturer founded in 2006 that designs and hand-builds vintage-style tube recording studio equipment — including tube compressors, equalizers, and preamps — for professional recording studios, mix engineers, and Grammy-winning producers worldwide.

Ownership category

akta.pro rank

Product category

Professional Audio Equipment

NAICS

Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals (334515)

SIC

Electronic & Other Electrical Equipment (No Computer Equip) (3600)

akta.pro primary industry

Pro Audio Equipment (Mics, Interfaces, Mixers, Studio Monitors) (MPAIAJAB)

Keywords

• Tube audio compressors
• Analog recording equipment
• Professional studio gear
• Vintage tube preamps
• Tube equalizers

Headquarters

HQ city

Northern CA

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Supply Chain, Technology or R&D, Operations, Marketing or Sales

Revenue model

1. Hardware Sales: Sale of tube compressor, preamplifier, and equalizer units including Sta-Level, 176, Revolver, 2A3, 500PRE, DOUBLEWIDE, and DOUBLEWIDE II. Products are one-time capital purchases with premium pricing targeting professional recording studios.
2. Replacement Tubes and Parts: Sale of tested tube sets for Retro products. Tubes are tested and matched for specific products, sold at $95-$295 per set depending on the product. Also sells Link Panels for $165.
3. Plugin Licensing: Official plugin version of the Retro Sta-Level hardware developed in partnership with Kazrog. This provides recurring software licensing revenue from the hardware's sonic character.

Pricing tiers

Go-to-market motion2 records

Distribution channels4 records

Marketing channels5 records

Core offering

Retro Instruments designs, manufactures, and sells vintage-style tube-based professional recording studio equipment including tube compressors, limiting amplifiers, microphone preamplifiers, and passive equalizers. Products recreate legendary vintage circuits — Gates Sta-Level, Bill Putnam's UA 176, Pultec EQ, and EMI's modified Altec 436 — with modern refinements such as recallable precision controls, improved reliability, and transformer-balanced signal paths. All units are hand-built and tested in the United States using Cinemag transformers, NOS tubes, and audiophile-grade components.

Product overview

Retro Instruments Inc. offers a portfolio of vintage-style tube recording studio equipment designed and manufactured in the United States. The product lineup centers on tube-based dynamic processors (compressors/limiters) and equalizers, with the Sta-Level Tube Compressor and 176 Limiting Amplifier as flagship products inspired by classic Gates and Universal Audio designs. The 500 Series format products (500PRE, DOUBLEWIDE I/II) bring vintage tube performance to compact modular racks. The REVOLVER offers dual-channel compression based on EMI-modified Altec circuitry. The 2A3 provides passive tube equalization inspired by Pultec designs. Additionally, a Kazrog-developed software plugin emulates the Sta-Level. Discontinued products include the Powerstrip channel strip and OP-6 amplifier. All products emphasize authentic tube circuitry, transformer-balanced I/O, and classic recording studio sound.

Differentiator

Problem solved

Functional benefit

Brands

• POWERSTRIP Recording Channel: A high-powered channel strip capturing the tone of a tube mixing desk, Pultec-style tube EQ and British tube compressor. Discontinued product.
• OP-6 Portable Amplifier

Products and services

• Sta-Level Tube Compressor A recreation of the legendary 1956 Gates Sta-Level tube compressor with variable-mu design. Capable of 40dB of gain reduction, featuring six recovery time settings and three operation modes (Single, Double, Triple). Uses a pair of 6BA6 gain reduction tubes with transformer-balanced push-pull circuitry. Designed for professional recording studios and engineers.
• 176 Limiting Amplifier Based on Bill Putnam's classic UA 176 with authentic variable-mu tube design. Provides compression ratios of 2:1, 4:1, 8:1, and 12:1. Features continuously variable attack and release time, wide-range sidechain highpass filter, and up to 20dB of gain reduction. Designed for professional recording and mixing engineers.
• 500PRE 500 Series Tube Microphone Preamplifier 500 Series tube microphone preamplifier module packing the Sta-Level circuit topology into a single-width module. Features three tube gain stages, 48dB (low gain) or 76dB (high gain) amplification, phantom power, polarity reversal, and output level control. Uses three 12AT7 tubes. Designed for professional and project studios using 500 Series racks.
• DOUBLEWIDE I Tube Compressor Single-channel tube compressor for 500 Series format. Features four NOS 6BJ6 variable-mu tubes in fully complementary push-pull design with Cinemag transformer-balanced input/output. Single and Double time-constant modes, continuously variable attack and recovery. Designed for studios and engineers seeking vintage tube compression in a compact 500 Series module.
• DOUBLEWIDE II Tube Compressor Updated version of the DOUBLEWIDE with faster attack and release times, stereo linking capability, and improved signal-to-noise ratio. Single-channel compressor using 12AT7 and 12AU7 tubes with Cinemag transformers. Retains gray painted front panel and Simpson gain-reduction meter. Designed for professional studios requiring vintage tube compression in a 500 Series form factor.
• REVOLVER Dual-Channel Tube Compressor Dual-channel tube compressor based on EMI's modified Altec 436 (RS124). Fully differential all-tube signal path with continuously variable threshold, attack, and release. Ratio adjustable between 1.5:1 and 5:1. Features stereo linking and side-chain filter. Designed for professional recording studios and mix engineers requiring stereo vintage tube compression.
• 2A3 Dual Program EQ Two-channel passive tube equalizer accurate to Pultec EQ performance. Features vintage tube amplification with custom transformers, true passive equalization, subsonic filter (40/90Hz), LF boost/cut settings, and extended HF boost frequencies (1.5-16kHz). Designed for professional studios seeking passive Pultec-style program equalization.
• Kazrog Retro Sta-Level Plugin Officially endorsed software plugin version of the Retro Sta-Level hardware, developed in partnership with Kazrog. Offers Modern Mode (emulating Retro Sta-Level Gold Edition) and Vintage Mode (emulating original Gates Sta-Level). Includes sidechain HPF/LPF, wet/dry blend, Analog Entropy feature, and 100 professional presets. Targeted at producers and engineers seeking the Sta-Level sound in a digital workflow.
• Replacement Tube Sets Tested and matched replacement tube sets for all current Retro Instruments products. Priced at $95-$295 per set depending on product. Sold directly through the company website and shipped via USPS Priority mail within 24 hours.

Quantifiable outcome

• Sta-Level achieves 40dB of gain reduction with THD less than 1% at 30dB gain reduction
• +3 more outcomes

Named customers9 records

Segments3 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

One partnership is on record.

• KazrogcoreTechnology or IntegrationKazrog developed the official plugin version of the Retro Sta-Level hardware, officially endorsed by Phil Moore of Retro Instruments. The plugin includes both Modern Mode (emulating the Retro Sta-Level Gold Edition) and Vintage Mode (emulating an original Gates Sta-Level). Features include sidechain HPF/LPF, wet/dry blend, and Analog Entropy modeling. Ships with 100+ pro presets from industry engineers.

Scale indicators2 records

Recent moves6 records

Expansion highlights4 records

Direct peers

• Crane Song: Crane Song designs boutique professional signal processors (Egret, STC-8, HEDD) used by high-end mixing and mastering engineers — comparable in customer profile, distribution model, and product category to Retro Instruments.
• Bricasti Design: Bricasti Design manufactures high-end professional studio processors and reverb units (M7, M10) for elite recording and mastering facilities — directly comparable in premium positioning and pro-studio customer base to Retro.
• Universal Audio: Universal Audio manufactures premium pro audio hardware (compressor/limiter reissues, preamps) and operates the UAD plugin ecosystem — the most direct analog-and-digital competitor to Retro Instruments across both Retro's hardware and Kazrog-style software lines.
• Empirical Labs: Empirical Labs makes high-end studio dynamics processors (Distressor, EL8, FATSO) used by the same top mix engineers and producers who endorse Retro gear — direct overlap in pro recording-studio customers and product category.
• Rupert Neve Designs: Rupert Neve Designs builds premium transformers, preamps, and compressors (e.g., 1073, Portico series) for the same elite pro audio market, with overlapping designer-engineer heritage and studio-endorser customer base.
• API Audio: API manufactures professional recording consoles, 500-series modules, and outboard compressors/preamps (e.g., 2500, 512c) targeting the same major-studio and project-studio buyers as Retro Instruments.
• Manley Labs: Manley Labs designs and builds high-end tube-based studio processors, preamps, and EQs (e.g., Variable Mu, Massive Passive) for the same elite professional recording market that Retro Instruments serves.
• Chandler Limited: Chandler Limited recreates and modernizes classic EMI/Abbey Road console and outboard designs (TG, RS124, Zener limiter) for professional studios — directly comparable in philosophy and customer to Retro Instruments' vintage-reissue approach.

Emerging players

• Warm Audio: Warm Audio produces affordable recreations of classic vintage outboard gear (WA-2A, WA-76, EQP-WA) using a similar reissue philosophy to Retro Instruments, but at substantially lower price points targeting project and home studios.

Broad incumbents

• Solid State Logic (SSL): SSL is a large incumbent manufacturer of professional mixing consoles and outboard processors (e.g., Bus+, Fusion) serving a much broader pro and commercial audio market than Retro's narrow vintage-tube niche.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/retro-instruments-inc.

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Retro Instruments Inc.