Pricing and availability

* Product prices and availability are updated by Equipboard every 24hrs and are subject to change. Equipboard may receive compensation for purchases made at participating retailers linked on this site. This compensation does not affect what products or prices are displayed, or the order of prices listed. For more information, please refer to our affiliate disclosure.

Description

Experience vintage charm fused with modern prowess with the RCA OP-6. Originally hailed as the "Holy Grail" of tube preamps for ribbon microphones since its inception in the 1950s, the legendary RCA OP-6 has been resurrected and meticulously enhanced by Retro Instruments. This preamp isn't just a nod to the past—it's a full-throttle leap into the future of studio recording.

With over 80dB of gain, the OP-6 is your go-to for capturing the delicate nuances of low-output ribbon mics and quiet sources. The euphoric richness it imparts is astonishing, raising your recordings to a level where every detail is rendered with warm precision. Enhanced with modern conveniences like switchable mic impedance, this preamp ensures compatibility with a wide range of microphones, from vintage ribbons to modern condensers.

Retro Instruments has also integrated contemporary features that make the OP-6 a versatile tool in any studio. With a 25dB attenuator pad, phase switching, and 48V phantom power, you have the flexibility to handle any recording scenario with ease. A high-quality VU meter that doubles as a tube checker adds a practical touch, while an instrument input expands its functionality beyond microphones.

Whether you're a seasoned pro or a budding enthusiast, the RCA OP-6 offers a unique blend of historic tone and modern utility, making it an indispensable addition to your recording arsenal.

Key Features:

  • Stepped gain control for precise adjustments
  • Switchable mic impedance (37/150/600)
  • Over 80dB of gain for exceptional headroom
  • Phase switch for polarity inversion
  • 48V phantom power for condenser mics
  • Instrument input for DI-ing guitars and basses
  • 25dB pad for loud sources
  • High-quality VU meter serves as a tube checker
  • Output attenuator control for proper gain staging
  • Improved noise performance for classic tone without hiss
  • Durable, aesthetically faithful design

Product specs

Brand RCA
Model Portable Amplifier OP-6 Microphone Preamp
Finish Black
Year 1940s
Made In United States
Categories Microphone Preamps

FAQs

What makes the RCA OP-6 preamp unique compared to modern preamps?

The RCA OP-6 is renowned for its vintage tube sound, offering a warm and rich tonal character that modern solid-state preamps often lack. Its all-tube design from the 1940s provides a distinct sonic quality appreciated by vintage gear enthusiasts.

Is the RCA OP-6 suitable for recording vocals?

Yes, the RCA OP-6 is well-suited for recording vocals, providing a classic tube warmth and presence that enhances vocal recordings. Its vintage circuitry is ideal for capturing the nuances of vocal performances.

How does the RCA OP-6 handle high-gain applications?

The RCA OP-6 is capable of handling high-gain applications effectively, thanks to its tube-based design which delivers smooth saturation and natural compression. It's particularly favored in recording scenarios where a vintage, saturated sound is desired.

What type of microphones pair well with the RCA OP-6 preamp?

Ribbon and dynamic microphones pair exceptionally well with the RCA OP-6, as its tube circuitry complements the warm and smooth characteristics of these microphone types, enhancing their natural sound qualities.

Creative Sound Lab

Creative Sound Lab

Chasing After a Massive Kick and Snare Sound with One Mic - RCA 44BX and RCA OP-6

Video thumbnail for Chasing After a Massive Kick and Snare Sound with One Mic - RCA 44BX and RCA OP-6 by Creative Sound Lab

Chasing After a Massive Kick and Snare Sound with One Mic - RCA 44BX and RCA OP-6

Creative Sound Lab

Creative Sound Lab

Video thumbnail for RCA OP-6 Tube Microphone Pre-Amplifier from the 1940's Drum tracking and V/O by shawn sullivan

RCA OP-6 Tube Microphone Pre-Amplifier from the 1940's Drum tracking and V/O

shawn sullivan

shawn sullivan

Reviews

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about RCA OP-6.

Setup and maintenance

  • Applying low AC voltage (e.g., 10V) to the primary can help determine the voltage setup by measuring and calculating transformer turns ratio.

    Source
  • It's advisable to examine power input transformer taps to ascertain voltage settings, essential for avoiding damage from incorrect voltage application.

    Source

Use cases and applications

  • RCA OP-6 amps are highly praised for pairing with RCA 44 ribbon microphones, creating an exceptional sound synergy.

    Source

Other

  • The lack of a power requirement notice on vintage RCA OP-6 amps can complicate identifying whether a unit is set for 110V or 220V.

    Source

Critic Reviews

Retro Instruments OP-6

soundonsound.com

The Retro Instruments OP-6 offers a beautifully crafted homage to the classic RCA preamp, boasting modern features like variable input impedance and phantom power. However, its considerable price tag raises eyebrows—at over £3000, many may question its value. While it delivers a warm, rich sound ideal for strong sources, it falls short in noise performance compared to contemporary solid-state alternatives. Additionally, the lack of CE approval markings and the impracticality of its portability may deter potential buyers. In a market filled with high-quality preamps, the OP-6 may not be justifiable for all but the most devoted vintage enthusiasts.

negative

Based on 0 Reviews and 0 Ratings

5 star
4 star
3 star
2 star
1 star

Artist usage

Add artist
See how Jack White uses RCA OP-6

Jack White

Guitarist, Drummer

The White Stripes

...
Verified via Soundonsound

Used on the room mics for Icky Thump, as stated by recording and mixing engineer Joe Chiccarelli in this October 2007 Sound on Sound interview.

“The Trident at Blackbird Studio D was used for monitoring, and also some guitar microphones, plus most of the room microphones. Some room mics went through an API 512, and a few through a crazy old RCA OP6 tube preamp. Most of the other close mics went through various Neve 1073, Brent Averill API 312 and Chandler TG2 preamps. Jack loves the sound of ribbon microphones, so we used a lot of them, on guitar amps, vocals, and as room mics: Coles 4038, Royer 121, AEA R84. I would have six to 10 room mics up, and would chose a stereo pair from them."

See how Meg White uses RCA OP-6

Meg White

Singer, Drummer

The White Stripes

...
Verified via Soundonsound

Used on the room mics for Icky Thump, as stated by recording and mixing engineer Joe Chiccarelli in this October 2007 Sound on Sound interview.

“The Trident at Blackbird Studio D was used for monitoring, and also some guitar microphones, plus most of the room microphones. Some room mics went through an API 512, and a few through a crazy old RCA OP6 tube preamp. Most of the other close mics went through various Neve 1073, Brent Averill API 312 and Chandler TG2 preamps. Jack loves the sound of ribbon microphones, so we used a lot of them, on guitar amps, vocals, and as room mics: Coles 4038, Royer 121, AEA R84. I would have six to 10 room mics up, and would chose a stereo pair from them."

Album Usage

The RCA OP-6 has been featured on the following albums:

Used With

Based on how musicians on Equipboard use RCA OP-6, it is most commonly used with the following gear.

API 512c
API 512c Preamps & Channel Strips
2
Neumann U87
Neumann U87 Condenser Microphones
1
Shure SM57
Shure SM57 Dynamic Microphones
1
Royer R-121
Royer R-121 Ribbon Microphones
1
Neumann U67
Neumann U67 Condenser Microphones
1
Coles Electroacoustics 4038
1

More RCA Preamps

Avalon VT-737SP

$1,643.00 - $4,199.00

# 1

Rank

Matthew Bellamy Skrillex Chris Stapleton
106 artists using
API 512c

$840.37 - $977.00

# 2

Rank

Kevin Parker Jack White Ray Toro
33 artists using
AMS Neve 1073

$3,394.26 - $4,115.00

# 4

Rank

Kevin Parker Billie Joe Armstrong John Mayer
86 artists using
Focusrite ISA One

$515.00 - $699.99

# 5

Rank

Mac DeMarco Lil Peep Bonobo
10 artists using
Universal Audio 4-710D

$1,750.00 - $1,999.00

# 6

Rank

Ray Toro Dijon Oneohtrix Point Never
10 artists using
AMS Neve 1073LB

$945.57 - $1,285.00

# 7

Rank

Chris Martin Lorn Manny Marroquin
14 artists using
Radial Tonebone PZ-Pre

$333.00 - $464.00

# 8

Rank

Chris Cornell James Taylor Masaru Teramae
11 artists using
Rupert Neve Designs 511

$777.00 - $849.00

# 9

Rank

Josh Dun Oliver Ackermann Bibio
5 artists using
AMS Neve 1073DPA

$1,890.00 - $2,830.00

# 10

Rank

Avicii Steven Wilson Matt Berry
12 artists using
AMS Neve 1073 SPX Preamp / EQ

$1,699.00 - $2,095.00

# 11

Rank

Geddy Lee Keshi Andy Morin
9 artists using
Warm Audio WA73-EQ

$729.00 - $899.00

# 12

Rank

George Clanton nothing,nowhere. Josh Turner
6 artists using
Focusrite OctoPre MkII

 

# 13

Rank

Kevin Parker Brian Eno Ulrich Wild
5 artists using
Focusrite ISA Two

$795.00 - $999.99

# 14

Rank

Frank Ocean Yuki Kajiura Sick Individuals
3 artists using
ART Tube MP

$45.00 - $129.99

# 17

Rank

Mac McCaughan Tobin Sprout Andre .S
5 artists using
Audient ASP880

$800.00 - $1,799.99

# 18

Rank

Tim Henson Alex Rüdinger Shook
5 artists using
Art Tube MP Project Series

$143.00 - $169.00

# 21

Rank

mndsgn James Petralli Mirrored Theory
3 artists using
Great River ME-1NV MIC PREAMP

$1,150.00 - $1,500.00

# 22

Rank

Matt Didemus Andy Schichter
2 artists using
ART Pro MPA II

$492.00 - $579.00

# 24

Rank

Josh Turner Ivan Julian Zac Tiessen
3 artists using
Warm Audio WA12

$300.00 - $449.00

# 25

Rank

George Clanton Jonwayne
2 artists using
Vintech Audio X73i

$1,200.00 - $1,375.00

# 26

Rank

Joe Bonamassa Kashiwabara Yuzuru Headscan
3 artists using
Warm Audio TB12 Tone Beast

$649.00 - $699.00

# 29

Rank

Mandrax Icon
1 artist using
BAE Audio 1073 MP

$1,233.00 - $1,370.00

# 30

Rank

Mk.gee Deadmau5 Travis Scott
12 artists using
API 3124+

$2,542.50

# 31

Rank

Aphex Twin Toru Kitajima Hozier
17 artists using
sE Electronics DM1 Dynamite

$68.40 - $109.00

# 32

Rank

Logan Paul
1 artist using
Triton Audio FetHead

$55.99 - $79.95

# 33

Rank

DJ Jino
1 artist using
Avalon VT-747SP

$3,866.00

# 34

Rank

Armin Van Buuren Owl City Diplo
13 artists using
ART Voice Channel

$447.34 - $689.99

# 36

Rank

Matuê Nico Astegiano
2 artists using
BAE Audio 1084

$1,200.00 - $3,945.00

# 37

Rank

Kevin Shields The Weeknd Justin Meldal-Johnsen
7 artists using
Warm Audio WA12 MKII

$398.00 - $449.00

# 38

Rank

Andy Larocque Temu
2 artists using
Grace Design m101

$833.00 - $874.00

# 39

Rank

Darude
1 artist using
Heritage Audio HA73EQ

$1,699.00 - $1,999.00

# 40

Rank

Dijon Tom S. Englund Colin Sipos
3 artists using
See also: Preamps, RCA, RCA Preamps

Accessories & Related Items

Community setups

Similar

Gear Guides