4-1000A Tubes For Sale: 4-1000A Tube Specs, Data Sheet & Substitute Info
4-1000A tubes for sale
Single or multiple 4-1000A tubes for sale: Available quantities:
The Penta Labs 4-1000A is stocked as new manufacture, with an optional Amperex-branded 4-1000A (NOS/legacy) variant for customers seeking period-correct replacements. If you’re looking for a 4-1000A tube for sale that drops into classic broadcast rigs, HF linear amplifiers, or RF/dielectric heaters, this unit is built to original spec and qualifies as a reliable 4-1000A replacement.
The Amperex variant is fully interchangeable; choose by brand preference, provenance, or project requirements—performance remains within the same operating envelope.
4-1000A tube specs
The table below lists general specifications commonly referenced for selection and planning. For the complete ratings and curves, use the data sheet in the section that follows.
4-1000A General Specifications
| Specification | Details |
|---|---|
| Tube type | High-power transmitting triode, glass construction |
| Filament (heater) | 7.5V at 21A, standard SK-510 base socket |
| Maximum plate dissipation | 1,000W, forced air cooling required |
| Typical plate voltage | 3.0-6.0kV, depending on service (AM, CW, Linear) |
| Frequency range | Up to 110 MHz |
| Cooling | Radiation and forced air |
| Equivalents / AKAs | 8166; 4-1000 (earlier version) |
| Direct replacement | Eimac 4-1000A/8166, interchangeable with Amperex 4-1000A |
| Typical applications | HAM HF linears, AM broadcast transmitters, FM broadcast modulators, RF/dielectric heating systems |
4-1000A tube data sheet download
Download the complete data sheet for detailed ratings, characteristic curves, typical operating points, and cooling guidance.
Download 4-1000A Data Sheet (PDF)
4-1000A tube substitute & equivalent information
This model is a direct replacement for Eimac 4-1000A / 8166 and is fully interchangeable with Amperex, RCA, Machlett, Taylor, and other compliant 4-1000A models.
In many legacy installations originally labelled “4-1000,” the 4-1000A supersedes the earlier version without circuit changes. As a 4-1000A tube equivalent, it commonly serves in 1 kW-class AM broadcast transmitters, high-power HF linear amplifiers for amateurs, and industrial RF/dielectric heating generators.
The 4-1000A remains a proven workhorse across broadcast transmitters, HF linear amplifiers, and industrial RF/dielectric heating systems, valued for its reliability and full interchangeability with Amperex, RCA, Machlett, Taylor, and other legacy versions.
As a direct replacement for Eimac 4-1000A / 8166, it offers modern manufacturing consistency while preserving classic triode performance.
Penta Labs, a trusted vacuum tubes producer for professionals and engineers, continues to supply precision-tested tubes for both legacy and new designs. For related components, see our durable radio tubes, precision hifi vacuum tubes, and compatible tetrode vacuum tube lines supporting high-power RF systems.
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