RCA

12AX7 / ECC83 RCA Long Gray Plates Square Getter Tube - Balanced - Made in USA '50s

Name: 12AX7 / ECC83 RCA Long Gray Plates Square Getter Tube - Balanced - Made in USA '50s
Brand: RCA
SKU: 03641
Price: 64.90 EUR
Availability: OutOfStock

€64,90 EUR

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12AX7 / ECC83 RCA – Long Gray Plates – Square Getter – Made in USA ‘50s

AMPLITREX Tested – VERY STRONG – Low Noise & Microphonics – Vintage American RCA Production

Description:

This original 12AX7 / ECC83 RCA, produced in the USA in the 1950s, represents one of the most sought-after versions of the famous American dual triode, prized for its build quality and distinctive sonic character.

The internal structure showcases elements typical of RCA's best productions of the era:

Long Gray Plates
Square Getter
robust and precise internal construction

The square getter is a characteristic configuration of early productions, particularly appreciated today for vacuum stability and longevity.

The tube has been tested in our lab with Amplitrex AT-1000, yielding a VERY STRONG result, and verified for Low Noise & Microphonics, making it suitable even for sensitive circuit positions.

Sonic Characteristics

This 1950s RCA configuration offers a typically warm, full, and three-dimensional sound, with an extremely natural musical presentation.

Bass: Deep and round, with excellent structure and a sense of body. Never intrusive, but always well-controlled.

Mids: The true strong point: rich, textured, and incredibly expressive. Vocals are present, believable, and full of nuances.

Highs: Sweet and refined, never aggressive. Excellent extension with a velvety rendition typical of the best vintage RCA productions.

Dynamics: Smooth and natural, with a musical response that favors coherence and musicality over artificial impact.

Soundstage: Wide and well-layered, with excellent instrument separation and realistic depth.

🎧 Use in Hi-Fi Amplifiers

Ideal for:

tube preamplifiers
vintage and modern integrated amplifiers
phono stages (thanks to low noise)
quality buffers and line stages

Perfect for systems that require musicality, naturalness, and realistic harmonic reconstruction, with a typically "American" sonic footprint.

🎸 Use in Musical Applications

Also highly valued in instrumental settings for:

guitar amplifiers
vintage organs and instruments

It offers a warm, progressive, and musical response, with soft and controlled saturation, ideal for those seeking character without harshness.

🎯 Note for audiophiles

This 1950s RCA represents a highly interesting choice for those who desire a 12AX7 with an authentic vintage character, solid construction, and high performance.

The VERY STRONG test on Amplitrex and the Low Noise & Microphonics verification guarantee stable and reliable operation, making it suitable even for critical circuit positions.

A tube that combines history, construction, and musicality, designed for those who seek not just performance, but a true listening experience.

Test Results

Tested on AMPLITREX AT-1000 Tube Tester

Voltage Test: Va = 250V, Vg = -2V
Average 100%: Gm = 1600 ; Ia = 1.2 mA
TEST RESULT: VERY STRONG

Tube :

Section 1: Gm = 1500 ; Ia = 0.9 mA
Section 2: Gm = 1500 ; Ia = 0.9 mA

Additional Tests Performed:

Microphonics: Low Noise & Microphonics – Tested and suitable for use in hi-fi systems and guitar amplifiers.
Balance: Very good. The sections are consistent and well-aligned, making the tube suitable for use as a phase inverter in hi-fi and instrumental applications.
Emission Quality: Excellent – Very strong and stable emission, without fluctuations.
Shorts and GAS: Absent.

Condition:

Condition: Vintage Tubes - Tested and fully functional. Supplied in our custom box for optimal protection.
Functionality: Perfectly operational.
Aesthetic condition: Sufficient – Labels completely worn off. See photos for details.

Manufacturing Code:

indecipherable, identifiable by construction characteristics. 1950s

Discover why our tubes are different →

Terms of Sale & Safety

Sales Terms & Product Safety

Each vacuum tube is carefully selected, tested, and verified in our laboratory before shipment. Where stated in the listing, test results, matching data, and declared characteristics refer to measurements performed using the specified test equipment and operating conditions.

Sound descriptions are provided for guidance only and reflect the characteristics generally associated with that particular tube type. Personal sound preferences, tube rolling, or perceived differences between audio systems do not constitute a product defect.

Before installation, please verify the tube’s electrical and mechanical compatibility with your equipment and follow the manufacturer’s instructions.

New production and NOS tubes are shipped with a tamper-evident security seal and internal technical documentation to ensure traceability of the product’s condition at the time of shipment.

Product Safety (GPSR)

Vacuum tubes are electronic components intended exclusively for use in compatible equipment and must be installed in accordance with the equipment manufacturer’s instructions.

Due to their historical or vintage nature, certain technical specifications may be based on original datasheets or equivalent technical documentation when documentation from the specific manufacturer is unavailable.

Use only with suitable equipment. Keep out of reach of children.

Shipping & Returns

We ship worldwide using carefully selected express carriers and protective packaging specifically designed for vacuum tubes.

If you change your mind, you may exercise your right of withdrawal within 14 days of delivery, where applicable under the relevant consumer protection laws. The product must be returned complete with its original packaging and accessories, in the same commercial condition in which it was received. Return shipping costs are the responsibility of the customer.

Every returned item undergoes a technical inspection. Installation, use, tube rolling, or any other handling may reduce the product’s commercial value and may affect the refund amount, in accordance with applicable law.

If you believe the product has a lack of conformity, our laboratory will carry out the necessary inspections and apply the remedies provided by the applicable consumer protection legislation.

For further details, Customers are invited to consult the “Terms and Conditions” and “Refund Policy” sections of our website, or to contact us before placing an order.

Vacuum Tubes Treasures
www.vtt.store | www.vacuumtubestreasures.com
📧 info@vacuumtubestreasures.com

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RCA 12ax7

Well I couldn’t be happier with the store. When I was unsure till I had done some more research, they provided me with the info on how they had identified the valve cos it had lost its label and code. I verified and they are right. Good service so have used again. Valve is as described. Good bass extentin and smooth top. Sparkly but not too much. Running through tekefunken phase splitter and 1960 fat base Mullard rectifier. So, tight bass, warm and full with enough slam but not excessive. Lively fulll mid and detailed top. Not as clinical as an Amperex or telefunken, much more musical and cohesive. The instruments don’t stand in their own space, so if you want complete separation then it ain’t for you. Lovely straight wall of sound, which is what was looking for with this one. Glues the music together rather than letting you know exactly where everyone is. Sound stage is wide. I’m overall happy with it. Does what I wanted and sounds like it should.

Dear Mr. Mohammed,

Thank you very much for taking the time to update your review and for sharing such a detailed description of your listening experience.

We are delighted to know that the RCA 12AX7 met your expectations and integrated so well into your system. Your observations about its warm, musical presentation, bass control and smooth high frequencies are greatly appreciated, especially considering the care you have taken in assembling your audio chain.

We also sincerely appreciate your mention of our identification process. Authenticity and technical transparency are fundamental values for us, and we are always happy to explain how we identify and verify each vintage tube.

Thank you once again for your trust and for sharing your experience with other enthusiasts. We remain at your full disposal whenever you need advice or assistance with future tube selections.

Kind regards,
The Vacuum Tubes Treasures Team

ATTENTION PLEASE
Please understand that the writing on the glass of vintage valves has become very delicate over the years and comes off easily. You must handle them with extreme care to avoid this. Wear and damage to the writing on the valves reduces their market value and causes damage. Please exercise extreme caution.
ATTENTION PLEASE
We wish to inform you that any attempts to manipulate shipping destination information in order to obtain lower shipping rates may be considered fraudulent acts. Please provide accurate information and contact us if you have any concerns. We reserve the right to review and, if necessary, cancel orders that we deem to be in violation of our conditions. Thank you for your understanding and cooperation.

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Proffesional with real measurements services

Thèse are not the first tubes that I order from VTT. They are real proffesionals, make real measurements and the description of the sound of tube that they make is true. Fully satisfied

Dear Alain,
Thank you very much for your continued trust in VTT.
We are delighted that you appreciate the accuracy of our measurements and the care we put into describing each tube as clearly as possible.
It is always a pleasure to serve you.
Kind regards,
The Vacuum Tubes Treasures Team

1949 long great plate

I checked to see if I could get another and I could not. It was perfectly balanced and very useful!

Dear Steve,

Thank you very much for your feedback.
We are delighted that the Sylvania 12AX7 proved perfectly balanced and is performing so well in your system.

Eccellenti!

Gentile Sig. Mirabella,
La ringraziamo per il Suo riscontro.
Siamo molto lieti che la coppia di 12AY7 GE abbia soddisfatto pienamente le Sue aspettative.
Cordiali saluti,
Lo Staff di Vacuum Tubes Treasures

Rivenditore top

Oggetto arrivato con molta cura è perfettamente funzionante. Aspettative superate di gran lunga.

Gentile Sig. Mirabella,

La ringraziamo sinceramente per le Sue parole.
Siamo molto lieti che la valvola sia arrivata in perfette condizioni e che l’esperienza d’acquisto abbia superato le Sue aspettative.

Cordiali saluti,
Lo Staff di Vacuum Tubes Treasures

Upgrade

Non ho grande esperienza di tube rolling, ma l’inserimento delle Baldwin ha portato a un miglioramento evidente rispetto ai tubi di serie. Ne sono soddisfatto

Gentile Sig. Lamon,

La ringraziamo per aver condiviso le Sue impressioni d’ascolto.
Siamo lieti che l’inserimento delle Baldwin by Sylvania abbia portato un miglioramento evidente rispetto alle valvole di serie e che ne sia soddisfatto.

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12AX7 / ECC83 RCA Long Gray Plates Square Getter Tube - Balanced - Made in USA '50s