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TELEFUNKEN

ECC83 / 12AX7 TELEFUNKEN Smooth Plates Diamond Bottom Tube Made in GERMANY

ECC83 / 12AX7 TELEFUNKEN Smooth Plates Diamond Bottom Tube Made in GERMANY

Regular price €99,90 EUR
Regular price €139,00 EUR Sale price €99,90 EUR
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ECC83 / 12AX7 GAP/R COMPUTOR by TELEFUNKEN Tested Tube - Smooth Plates Diamond <> Bottom Made in Germany '60s

AMPLITREX Tested – Low Noise & Microphonics – Vintage TELEFUNKEN Production

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:
 STRONG

Tube :

  • Section 1: Gm = 1400 ; Ia = 0.9 mA
  • Section 2: Gm = 1300 ; Ia = 0.7 mA

Additional Tests Performed:
  • Burn-in / Stability Test: 48h – OK
  • Microphonics: Low Noise & Microphonics – Tested and compliant for use in hi-fi systems and guitar amplifiers.
  • Balance: The sections are not perfectly aligned. The tube is suitable for use in non-critical hi-fi stages (input or driver) and in guitar amplifiers. Not suitable as a phase inverter or in applications requiring strict balance between sections.
  • Emission Quality: Good Emission – Good and regular emission, suitable for any application
  • Short Circuits and GAS: Absent.

Description:

Premium ECC83 / 12AX7 GAP/R COMPUTOR produced by TELEFUNKEN, an authentic German production from 1963, featuring the renowned Smooth Plates construction and the unmistakable Diamond <> Bottom, the diamond impressed in the glass between the pins that identifies original Telefunken Made in Germany productions.

The GAP/R COMPUTOR marking makes this specimen particularly interesting: behind the trade name, we find a true Telefunken ECC83, with the refined Smooth Plates construction that has become one of the most sought after among vintage European tube enthusiasts. The HN code dates the production to March 1963.

The tube has been accurately tested in our laboratory using an Amplitrex AT-1000 Tube Tester, achieving a STRONG classification. The two sections measured Gm 1400 / Ia 0.9 mA and Gm 1300 / Ia 0.7 mA respectively, with good and regular emission. A 48-hour Burn-in / Stability Test was also performed, which passed successfully, along with Low Noise & Microphonics selection. No short circuits, gas, or anomalies were detected.

Sonically, Telefunken ECC83 Smooth Plates are historically appreciated for their great transparency, precision, and ability to reproduce detail without losing naturalness. The mid-range is defined and articulate, the extremes are clean and controlled, and the overall presentation maintains the balance and sophistication typically associated with the best vintage Telefunken productions.

Suitable for hi-fi preamplifiers, integrated amplifiers, line stages, and guitar amplifiers compatible with ECC83 / 12AX7. The Low Noise & Microphonics selection allows for its use in input stages; however, since the two sections are not perfectly aligned, it is not the ideal choice as a phase inverter or in applications requiring particularly rigorous balancing.

The tube is Vintage, accurately tested and perfectly working, with very good aesthetic conditions and legible markings. It comes in our custom box for optimal protection.

A fascinating GAP/R COMPUTOR ECC83 / 12AX7 by TELEFUNKEN Smooth Plates Diamond <> Bottom from 1963, genuinely tested and selected by Vacuum Tubes Treasures, ideal for those who desire authentic German Telefunken construction with Low Noise & Microphonics at a professional selection level.


Conditions:

  • Conditions: Vintage Tubes - Tested and perfectly functional. Supplied in our custom box for optimal protection.
  • Functionality: Perfectly operational.
  • Aesthetic conditions: Very Good – Legible markings with slight signs of age. See photos for details.
  • Manufacturing Code: HN – TELEFUNKEN production March 1963 - Diamond impressed in the glass between the pins.

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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

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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  • 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.

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