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82

Sensibly equivalent to:
CV1773
    
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The Type 82 is a full wave mercury vapour rectifier designed for the original American standard AC heater voltage of 2.5 Volts.
Like all MV rectifiers it is characterised by a low, and almost constant, voltage drop across the tube when in operation, in this case the drop is just 15 Volts - much lower than a high vacuum rectifier.
The data-sheet describes the 82 as suitable for receivers using a Class B output stage as the HT regulation with the MV rectifier is particularly suited to the large variation in demand current that is a characteristic of the Class B amplifier.
The etched Type designation is very feint and visible here after some post camera enhancement.
As the Type 82 was designed for domestic equipment the Raytheon label makes sense. In general MV rectifiers are temperamental and reserved for industrial/professional applications.
The construction features ribbon filaments in flattened cylindrical anodes.
The top mica: the filament tension springs connect to the central vertical rods. The ribbon filament can be seen to be oxide coated.
The classic envelope is 44 mm in diameter, and excluding the UX4 base pins is 103 mm tall.
References: Datasheet, & 1043. Type 82 was first introduced in 1936.

 

Pin Connections
UX4
1
2
3
4
f
a(1)
a(2)
f

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
2.5
3.0
500
125
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 24, 2015.
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