TubePad 6.0 Tube Chart

Quick Reference Data

Name: 866
Use:
Glass type used in power supply of radio equipment having high dc requirements. Vertical tube mounting is standard. This is a mercury vapour rectifier, featuring a low voltage drop and a form of self regulation similar to other mercury rectifiers. Power the filament first, leave to warm for at least 15 min before applying plate voltage upon initial power up. I would even go as far as 30 min. There are several varieties of the 866, one being a "Junior" which has a max AC handling of 1250v, EIA base= 4B
Notes: Requires a 4-pin socket. 


866
Half-Wave Rectifier

Characteristics

Data Source and Substitute Data
Data Source ................................... ARRL Handbook 1961
Substitutes ................................... None 

Mechanical Data
Bulb .......................................... ST-9
Base .......................................... 4-pin socket
EIA Base ...................................... 4P

Electrical Data

Heater (Filament) Characteristics
Filament Voltage ................................ 2.5 Volts
Filament Current ................................ 5.0 Amperes

Maximum Ratings Each Diode
Peak Inverse Plate Voltage ...................... 10000 Volts

Characteristics and Typical Operation

Rectifier
AC Plate Supply Voltage (RMS) ................. 3500 Volts
DC Output Current ............................. 250 mA.
DC Output Voltage ............................. 3500 Volts