811A High-Mu Power Triode • Minimum Order: $25.00 in Parts • Product Returns are subject to 15% Re-stock fee.

The Svetlana 811A is a power triode intended for use in class AB, class B and class C RF and Audio amplifiers. Svetlana 811A tubes feature a low loss ceramic base and bonded-ceramic plate cap thermal insulator for high power RF transmitting tube capability. Two temperature-initiated getters designed specifically for transmitting tubes are mounted on the plate for superior gas absorption. These getters operate only at high temperature and are far more effective in comparison to the receiving tube flash getters silvered on the inside surface of the glass envelopes of tubes made with receiving tube techniques. The envelope is fabricated from hard glass intended specifically for the high-temperature operation of transmitting tubes.

The internal tube parts are supported by low loss ceramic insulators for high-temperature operation and high voltage hold-off. Against the envelope, mica supports are used to absorb shock. The internal structure is well supported and is aligned with respect to the base pins to avoid internal shorts in equipment designed for horizontal mounting of the original RCA 811A.

The Svetlana 811A is manufactured in Russia at the Electronpribor Manufacturing Corporation in Ryazan. The strict manufacturing and quality control systems at Electronpribor are similar to those at the Svetlana complex in St. Petersburg where Svetlana ceramic power tubes and the majority of Svetlana glass power tubes are produced.