Radio Valve Data: 1915-1960

Keith R Thrower OBE, The Valve Museum, April, 2022.

Triode Receiver Valves (pre-1926)^*

Type or
Trademark

Filament

Anode

Grid

r_a

g_m

μ

Year

Base

Notes
and applications

^{(1)The letters indicate the three types of filaments found on these valves. B = bright emitter, D = dull emitter, O = oxide-coated.}

Volts

Amps

Volts

-Volts

kΩ

mA/V

^{(2)The year shown is when it is believed the type was first issued. This date is accurate for most types but cannot be guaranteed for them all.}

^{(3)Pin-out details for non-exhibits can be found with the base details.}

  ^{★This table lists valves that were manufactured in the UK or which were claimed to be of UK manufacture. In practice several of the smaller companies imported their valves from abroad.}

 Six Sixty

Six-Sixty

D

1.5-2.0

0.30

30-80

3.0

30.0

0.17

5.0

1924

B4

General purpose

S.S.1 (blue)

B

3.7

0.66

50-100

0-9

28.0

0.30

8.5

1925

B4

General purpose

S.S.2 (gn. disk)

D

2.0

0.30

30-100

3-6

16.0

0.40

6.5

1925

B4

Det./AF amplifier

S.S.2 (red disc)

D

2.0

0.30

50-125

60.0

0.28

17.0

1925

B4

RF amp./det./RCC amp.

Post-1925 amplifying valves, frequency changers
and signal diodes

Type

Description

Filament

Anode

Auxillary Grid

Grid

r_a

g_m/g_o

R_L

P_o

R_k

Base ^{(1)Pin-out details for non-exhibits can be found with the base details.}

Year

Volts

Amps

Volts

mA

Volts

mA

-V

kΩ

mA/V

kΩ

Watts

Ω

Type

Ref

 Six Sixty

 Note: for Loctal B8G read B8B, USS & USM = UX, Y8A = Footless

Mullard Equivalents

SS2AHF

PM1HF

1926

SS2ALF

PM1LF

1926

SS2HF

D.3HF

1926

SS3HF

DE3B

1926

SS3LF

PM4

1926

SS4

DFA1

1926

SS4D AC

164V

1929

SS4DDT AC

TDD4

1933

SS4Det AC

164V (1930 version)

1930

SS4DG AC

Possibly PM4DG

SS4DX AC

904V

1931

Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others

SS4GP AC

354V

1930

SS4HL AC

244V

1933

SS4L AC

164V (later version)

1931

SS4MM AC

MM4V

1932

SS4P AC

104V

1929

SS4Pen

PM24A

1929

SS4Pen AC

Pen4V

1931

SS4PenA AC

Pen4VA

1933

SS4PenM

PM24M

1932

SS4PenSP

PM24A

1931

SS4SG AC

S4V

1929

SS4SP AC

054V

1931

Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others

SS4VM AC

VM4V

1932

SS4XSG AC

S4VA

1930

SS4YSG AC

S4VB

1930

SS6

DFA4

1926

SS7

PM4

1927

SS7A

PM254

1927

SS8

PM3

1926

SS9

PM5

1926

SS10

PM2

1926

SS11

PM6

1926

SS11A

PM256

1927

SS12

PM5X

1927

Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others

SS13

PM5B

1927

SS210D

PM2DX

1931

SS210DDT

TDD2A

1934

SS210DG

PM1DG

1931

SS210HF

PM1HF

1928

SS210HL

PM1HL

1933

SS210LF

PM1LF

1928

SS210RC

PM1A

1928

SS215P

PM2

1928

SS215SG

PM12

1929

SS215VSG

PM12V

1932

SS217D

PM2DX

1930

Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others

SS218HP

SP2

1934

SS218SG

PM12A

1928

SS218VP

VP2

1934

SS218VSG

PM12M

1932

SS220B

PM2B

1933

SS220P

PM2

1929

SS220PA

PM2A

1931

SS220Pen

PM22A

1932

SS220SP

PM202

1931

SS225D

PM2DX

1929

SS230Pen

PM22

1928

SS230PP

PM22

1928

Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others

SS230SP

PM252

1929

SS240SP

PM252

1931

SS410D

PM4DX

1929

SS410P

PM4

1928

SS415PP

PM24

1928

SS420SP

PM254

1928

SS425SP

PM254

SS610D

PM6D

1929

SS610P

PM6

1928

SS617PP

PM26

1929

SS625SP

PM256

1928

SS625SPA

PM256A

1930

Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others

SS4075HF

PM3

1928

SS4075RC

PM3A

1928

SS4075SG

PM14

1928

SS6075HF

PM5X

1928

SS6075RC

PM5B

1928

SS6075SG

PM16

1929

SSHP1AC

SP4

1933

SSHP2AC

VP4

1933

SSHV4/1

ACO64

1931

SSHV4/2

AC044

1931

SSHV6/5

DO25

1930

Rectifiers

Type

Class

Cathode

Va

DC Ia

PIV

DC Vo

Base

Year

Type

Volts

Amps

Max RMS

mA

Volts

Volts

Type

Ref

Year

 Six Sixty

 Note: for Loctal B8G read B8B, USS & USM = UX, Y8A = Footless

SSIH60/250

FW

IH

4.0

1.20

250

60

B4

14

1933

SSIH120/350

FW

IH

4.0

2.40

350

120

B4

14

1933

SSU465

HW

DH

4.0

1.00

500

60

B4

4

1930

SSU765

HW

DH

7.5

0.60

500

60

B4

4

1930

SSW60/250

FW

IH

4.0

1.20

250

60

B4

14

SSW120/350

FW

DH

4.0

2.00

350

120

B4

5

1931

SSW120/500

FW

DH

4.0

2.00

500

120

B4

5

1931

SSW432

FW

DH

4.0

0.60

250

30

B4

5

1930

SSW462

FW

DH

4.0

1.00

250

60

B4

5

1930