Vacuum Tube Datasheet Library

Search Glass Audio's original summaries of manufacturer vacuum tube specifications. Find a valve designation or manufacturer, read the compatibility context here, then consult the complete source document before making a technical decision.

Last reviewed: 19 October 2026. These records distinguish specific modern manufacturer models from historical type references. Brands, suffixes and revisions can differ. Document dates are shown where established; an unknown date is identified as such.


29 manufacturer document records

EL34B — Tung-Sol

Function: Power output valve.

Heater 6.3 V, 1.5 A; plate-dissipation limit 25 W. Check the screen-grid limits separately and do not use maximum ratings as bias instructions.

Read the Tung-Sol EL34B manufacturer PDF · Related Glass Audio listing or category

Source publisher: New Sensor / Electro-Harmonix manufacturer document catalogue. Document revision/date: not established. Redistribution permission: not confirmed; this PDF remains at its source.

EF92 — historical Philips reference

Philips’ 11 November 1953 sheet identifies an RF pentode with a seven-pin miniature base and a 6.3 V, 0.2 A heater. Its stated RF application extends to 160 MHz under appropriate circuit conditions. These are type-reference figures, not the test results of an individual valve or proof of its original factory.

Read the original Philips reference PDF · Related Glass Audio listing or category

Source publisher: Philips. Document date/revision: 11 November 1953. Redistribution permission: not confirmed; this PDF remains at its source.

ECC85 / 6AQ8 — historical Philips reference

The December 1969 Philips ECC85 sheet describes a Noval double triode for RF and AF amplification and self-oscillating mixer service, with a 6.3 V, 435 mA heater. Two sections in one envelope do not establish measured matching. Do not apply generic ECC81/ECC82/ECC83 heater connections or characteristics to this type.

Read the original Philips reference PDF · Related Glass Audio listing or category

Source publisher: Philips. Document date/revision: December 1969 (first sheet; later pages dated January 1969). Redistribution permission: not confirmed; this PDF remains at its source.

12AT7EH — Electro-Harmonix

The EH electrical-parameter table lists heater-current minimum/maximum figures of 350–390 mA at 6.3 V or 175–195 mA at 12.6 V. Limiting values include 330 V plate voltage and 3.25 W plate dissipation per triode. These are model data, not circuit instructions or individual measurements; the dissipation limit is not audio output power.

Read the original Electro-Harmonix reference PDF · Related Glass Audio listing or category

Source publisher: Electro-Harmonix. Document date/revision: Not established. Redistribution permission: not confirmed; this PDF remains at its source.

12AU7A / ECC82EH — Electro-Harmonix

This is the 12AU7A/ECC82EH document linked under 12AU7EH in the manufacturer catalogue. It lists heater-current minimum/maximum figures of 300–350 mA at 6.3 V or 150–175 mA at 12.6 V. Limits include 300 V plate voltage and 2.75 W plate dissipation per triode. Confirm exact markings and operating requirements rather than generalising to every 12AU7.

Read the original Electro-Harmonix reference PDF · Related Glass Audio listing or category

Source publisher: Electro-Harmonix. Document date/revision: Not established. Redistribution permission: not confirmed; this PDF remains at its source.

6BM8EH / ECL82 — Electro-Harmonix

Function: Triode and output pentode.

The model-specific sheet lists 770–930 mA heater current and 8 W maximum pentode plate dissipation. Use its own connection diagram and limits; a historical ECL82 heater figure is not automatically the EH model figure. Dissipation is not audio output power.

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Source publisher: Electro-Harmonix. Document revision/date: Not established in the inspected sheet. Redistribution permission: not confirmed; this PDF remains at its source.

EF86 / EF806SG — EH-linked manufacturer reference

Function: Small-signal pentode.

The sheet linked from the EH index is headed EF86/EF806SG. It lists 185–215 mA heater current at 6.3 V and 1 W maximum plate dissipation. A shared document header does not establish a selected EF806SG grade, low-noise measurement or test result for an individual EF86 listing.

Read the original manufacturer PDF at its source · Related Glass Audio listing or category: check current item details

Source publisher: Electro-Harmonix specifications index. Document revision/date: Not established in the inspected sheet. Redistribution permission: not confirmed; this PDF remains at its source.

5U4GBEH — Electro-Harmonix

Function: Full-wave rectifier.

The model sheet uses a 5 V filament reference and lists 2.7–3.4 A filament current. Its maximum average rectified-current figure is 250 mA. Those values do not establish transformer suitability, a universal reservoir-capacitance allowance or automatic GZ34/5AR4 interchangeability.

Read the original manufacturer PDF at its source · Related Glass Audio listing or category: check current item details

Source publisher: Electro-Harmonix. Document revision/date: Not established in the inspected sheet. Redistribution permission: not confirmed; this PDF remains at its source.

7591AEH — Electro-Harmonix

Function: Beam-power output valve.

The model sheet lists 0.9–1.24 A heater current with 6.3 V reference operation and a 19 W plate-dissipation limit. Do not replace the stated range with an assumed historical heater current. The base connections differ from common 6L6/EL34/6V6 arrangements; octal fit does not establish a safe replacement.

Read the original manufacturer PDF at its source · Related Glass Audio listing or category: check current item details

Source publisher: Electro-Harmonix. Document revision/date: Not established in the inspected sheet. Redistribution permission: not confirmed; this PDF remains at its source.

6V6GT / 6V6EH — Electro-Harmonix

Function: Beam-power output valve.

The inspected sheet lists 460–530 mA heater current and a 13.2 W plate-dissipation limit. Its curves are operating-characteristic plots, not permission to treat every plotted voltage as a maximum rating. Use the exact model and equipment requirements, rather than generic 6V6-family figures.

Read the original manufacturer PDF at its source · Related Glass Audio listing or category: check current item details

Source publisher: Electro-Harmonix. Document revision/date: Not established in the inspected sheet. Redistribution permission: not confirmed; this PDF remains at its source.

5Y3GT — Sovtek model reference

Function: Full-wave rectifier.

This model sheet gives a 5 V heater reference, 1.6–2.2 A heater-current range and 140 mA maximum average rectified current. Its stated supply/load/capacitance example is conditional. Do not assume that this version reproduces every historical 5Y3 voltage drop or start-up characteristic.

Read the original manufacturer PDF at its source · Related Glass Audio listing or category: check current item details

Source publisher: Sovtek reference linked by Electro-Harmonix. Document revision/date: Not established in the inspected sheet. Redistribution permission: not confirmed; this PDF remains at its source.

E92CC — historical Philips reference

Function: Computer/counter double triode.

The original Philips sheet specifies a seven-pin, common-cathode double triode and a 6.3 V, 400 mA heater. It excludes circuits sensitive to hum, noise or microphonics. The historical special-quality designation is not evidence that an individual valve is a selected low-noise audio tube.

Read the original manufacturer PDF at its source · Related Glass Audio listing or category: check current item details

Source publisher: Philips; historical scan hosted by the Valve Museum. Document revision/date: 9 September 1958. Redistribution permission: not confirmed; this PDF remains at its source.

ECL82 — historical Philips reference

Function: Triode and output pentode.

The December 1969 sheet specifies a Noval base and 6.3 V, 780 mA heater. Its triode amplification factor of 70 is a reference characteristic, not the gain of a complete amplifier. ECL82 is not an ECC82 double triode; compare exact model connections and operating conditions.

Read the original manufacturer PDF at its source · Related Glass Audio listing or category: check current item details

Source publisher: Philips; historical scan hosted by Frank Philipse archive. Document revision/date: December 1969 maintenance-type sheet. Redistribution permission: not confirmed; this PDF remains at its source.

ECL83 — historical Mullard reference

Function: Triode and output pentode with separate cathodes.

The sheet specifies a 6.3 V, 600 mA heater and B9A base. The 5.4 W pentode plate-dissipation limit is separate from the conditional audio-output examples. Similar socket dimensions do not establish ECL82, ECL86 or PCL83 interchangeability.

Read the original manufacturer PDF at its source · Related Glass Audio listing or category: check current item details

Source publisher: Mullard; historical scan hosted by Frank Philipse archive. Document revision/date: Issue 1; printed codes 1058-1 to 1058-4; full date not established. Redistribution permission: not confirmed; this PDF remains at its source.

ECL86 — historical Telefunken reference

Function: Triode and output pentode with separate cathodes.

The Telefunken reference lists a 6.3 V heater at approximately 700 mA and a 9 W pentode anode-dissipation limit. That heat limit is not guaranteed amplifier output. Heater figures can differ between manufacturer sheets; check the intended model and circuit.

Read the original manufacturer PDF at its source · Related Glass Audio listing or category: check current item details

Source publisher: Telefunken; historical reference hosted by BTB Elektronik. Document revision/date: Not established in the inspected reference. Redistribution permission: not confirmed; this PDF remains at its source.

ECC88 / 6DJ8 family — historical Philips reference

Philips’ ECC88 sheet dated 1 January 1958 describes a Noval double triode for television-tuner cascode use, with a 6.3 V, 365 mA heater reference. This document does not identify the original factory of National-branded stock or establish its individual measurements. Compare full ratings before considering E88CC / 6922 substitutions.

Read the historical technical PDF at its source · Related Glass Audio listing or category: check current item details

Source: Philips; first two sheets dated 1 January 1958. This archive also contains separately dated characteristic sheets. Historical reference; individual stock measurements are not supplied by this document.

12BH7-A — historical RCA reference

RCA’s tentative data of 1 March 1955 describes a medium-amplification-factor twin triode with a Noval base. Heater configurations are 12.6 V at 0.3 A in series or 6.3 V at 0.6 A in parallel. The A suffix must not be inferred for an item labelled only 12BH7; this reference does not certify the factory or condition of another branded valve.

Read the historical technical PDF at its source · Related Glass Audio listing or category: check current item details

Source: RCA; tentative data, 1 March 1955. Historical reference; individual stock measurements are not supplied by this document.

6J6 — historical General Electric reference

GE sheet ET-T892, code 7-54, documents a seven-pin RF twin triode with a shared cathode. Its 6J6 heater reference is 6.3 V, 0.45 A. The same sheet covers 5J6 and 19J6 with different heater ratings; do not transfer their heater figures to the 6J6. The document is not proof of the factory behind Haltron or RCA ATES-labelled stock.

Read the historical technical PDF at its source · Related Glass Audio listing or category: check current item details

Source: General Electric; ET-T892, code 7-54. Historical reference; individual stock measurements are not supplied by this document.

6J6A — historical RCA reference

The RCA 6J6A Data 1 sheet, code 7-61, specifies controlled heater warm-up, a 6.3 V heater, current 0.45 A ±6% and an average 11-second warm-up. Its seven-pin diagram has a shared cathode. These are model specifications, not matching or noise measurements of the stocked valves.

Read the historical technical PDF at its source · Related Glass Audio listing or category: check current item details

Source: RCA; Data 1 code 7-61. Historical reference; individual stock measurements are not supplied by this document.

A1834 — historical Marconi reference

Marconi’s April 1953 A1834 sheet describes an indirectly heated octal double triode. Heater requirements are 6.3 V, 2.5 A; per-section anode limits include 250 V and 13 W. Those limits are not audio output power or operating instructions. Consult the separate DC-amplifier and scanning-booster conditions rather than combining ratings.

Read the historical technical PDF at its source · Related Glass Audio listing or category: check current item details

Source: Marconi’s Wireless Telegraph Company Limited; April 1953. Historical reference; individual stock measurements are not supplied by this document.

6080 — historical maintenance reference

The December 1968 maintenance sheet describes an octal double triode for series regulation, servo and booster applications, with nominal heater requirements of 6.3 V, 2.5 A. It distinguishes nominal characteristics, initial spread and limiting conditions. It does not establish the manufacturer, condition or certification of the Glass Audio listing; adding section currents does not by itself determine a safe output current.

Read the historical technical PDF at its source · Related Glass Audio listing or category: check current item details

Source: Historical 6080 maintenance document, December 1968; manufacturer attribution not established from the inspected scan. Historical reference; individual stock measurements are not supplied by this document.

How to use a valve datasheet

Begin with the exact designation and suffix, then check the pin diagram's viewing direction, heater requirements and maximum ratings. Typical characteristics apply at stated operating conditions. A maximum anode-voltage rating is not a recommended operating point, and mu is not the voltage gain of a complete amplifier.

Read the complete datasheet-reading guide or our E88CC / 6922 / 6DJ8 comparison.

Vacuum tube guides and vintage audio research

Original summaries and document rights

The explanatory summaries on this page are original Glass Audio content. The source PDFs belong to their respective rights holders. Public access to a document does not establish permission to republish it. No new PDF copies have been uploaded for this library. Manufacturer data and historical specifications must be kept separate; a later document is not evidence for every older valve bearing a related name.

Does a datasheet prove a valve is tested or matched?

No. It describes a model, not the condition of a particular specimen. Glass Audio tests valves before sale; not every item in stock has already been tested. Ask about the individual item and confirm any matching, low-noise or measurement requirement before ordering.

Compatibility and electrical safety

Similar bases and related designations do not establish safe interchangeability. Follow the equipment manufacturer's approved replacement information. Heater load, socket connections, bias, screen-grid conditions and physical clearances can all matter. High-voltage valve amplifiers can retain dangerous stored energy after unplugging. Internal measurements, repairs and bias adjustments require a qualified technician.

Ask Glass Audio about a valve or international postage quote. Provide the amplifier model, valve position, exact markings and required quantity.