COMPARISON OF SOME COMMON Full-Wave 4V RECTIFIER VALVES / TUBES
Arranged by Base - Current - Voltage
	Type	Base	Heater Volts	Heater Current	Direct	Anode Volts	Anode Current
				A	Indirect	RMS	mA mean
	UU30/150	B4	4.0	1.0	D	150	30
	UU30/250	B4	4.0	1.0	D	250	30
	DW2	B4	4.0	1.0	D	250	60
	UU3	B4	4.0	2.0	D/I	250	60
	U143	B4	4.0	1.1	D	500	60
	UU60/250	B4	4.0	1.3	D/I	300	75
	R1	B4	4.0	1.3	D/I	300	75
	DW4/350	B4	4.0	2.0	D	350	120
	IW4/350	B4	4.0	2.0	D/I	350	120
	R4	B4	4.0	2.5	D	350	120
	RV120/350	B4	4.0	2.0	D	350	120
	1807	B4	4.0	2.0	D	350	120
	U12	B4	4.0	2.5	D	350	120
	UU120/350A	B4	4.0	2.5	D/I	350	120
	UU4	B4	4.0	2.5	D/I	350	120
	R2	B4	4.0	2.5	D/I	350	120
	APV4	B4	4.0	2.0	D/I	400	120
	DW4/500	B4	4.0	2.0	D	500	120
	IW4/500	B4	4.0	2.5	D/I	500	120
	MU14	B4	4.0	2.5	D/I	500	120
	R43	B4	4.0	2.5	D	500	120
	R4A	B4	4.0	2.5	D	500	120
	RV120/500	B4	4.0	2.0	D	500	120
	U14	B4	4.0	2.5	D	500	120
	U18/20	B4	4.0	3.0	D	500	120
	UU12	B4	4.0	2.5	D/I	500	120
	UU120/500	B4	4.0	2.5	D/I	500	120
	UU5	B4	4.0	2.3	D/I	500	120
	FW4/800	B4	4.0	3.0	D	850	125
	UU10	B4	4.0	2.3	D/I	500	180
	RV200/600	B4	4.0	2.8	D	600	200
	AX50	B4	4.0	3.8	D	500	250
	FW4/500	B4	4.0	3.0	D	500	250
	43IU	B4	4.0	2.5	I	500	150
	45IU	B4	4.0	3.5	I	500	250
	AZ41	B8A	4.0	0.7	D	300	70
	AZ31	Int Oct	4.0	1.1	D	500	60
	UU6	Maz Oct	4.0	1.4	D/I	350	120
	UU7	Maz Oct	4.0	2.3	D/I	350	180
	UU8	Maz Oct	4.0	2.8	D/I	350	250
	AZ1	SC8	4.0	1.1	D	300	100
	NOTE  Care should be taken in interpreting these figures as the ratings are not directly comparable on
	account of variations in the permitted capacitative loading and minimum series resistance requirements.
	Full specifications should be taken into account when considering type interchange.
	D=Direct Heater,  I=Indirect,  D= Half Indirect - cathode connected to one end of filament.
	Technical and Scientific Supplies (www.TechnicalScientific.com)