Data: LowLow quality — significant gaps in core data (missing base, heater, universal parameters, or pins). Treat as a research stub; always cross-reference with datasheets.
DHT rectifier: the filament serves as the cathode; no heater-cathode isolation.
UY 5-pin base — not to be confused with the UX 4-pin base used on the 274A and similar WE rectifiers.
Very limited datasheet information is available; CV2606 is listed as an identical substitute by TDSL.
Rectifier section intentionally left empty: no published datasheet states Va_max, Ia_max, Vdrop, or PIV for type 284. Radiomuseum classifies it only as a 'common USA high-vacuum rectifier' with 6V/0.5A filament on a UY5 base, introduced pre-1928. Values should not be invented — re-populate only if a primary datasheet (RCA, WE, or CV2606 Admiralty pattern) is located.