Equivalent valves for old radios

Key to abbreviations

* No exact equivalent
B2 2 volt battery
B4 4 volt battery
B6 6 volt battery
IA4 Indirect 4v AC
DA4 Direct 4v AC
DA6 Direct 6v AC
DA10 Direct 10v AC

MULLARD COSSOR MARCONI/OSRAM MAZDA SIX-SIXTY Type Filament
PM12M 220VS VS2 S215VM 218VSG Screened grid multi-mu, tetrode B2
PM12V 220VSG * * 215VSG Screened grid HF amp, tetrode B2
PM12A 220SG S22 S215B 218SG Screened grid HF amp, tetrode B2
PM12 215SG S215, S21 S215A, SG215 215SG Screened grid, tetrode B2
PM1A 210RC H2 H210 210RC Resistance/capacity coupled amp, triode B2
PM1HF 210HF HL210 * 210HF Med. imp. HF or detector, triode B2
PM1HL 210HL HL210 HL210, HL2 210HL Non-microphonic detector, triode B2
PM1LF 210LF L210 * 210LF Med. imp. LF or detector, triode B2
PM2DX 210Det L2/B L210, L2 210D Detector & LF amplifier, triode B2
PM2A 220PA LP2 P220 220PA Power output, triode B2
PM2 220P P215 * 220P Power output, triode B2
PM202 * P2 P220A 220SP Super power output, triode B2
PM252 230XP P240 P240 240SP Super power output, triode B2
PM22A 220HPT PT2 Pen220 220Pen Low consumption output, pentode B2
PM22 230HPT, 220PT PT240 Pen230, Pen220A 230PP Super power output, pentode B2
PM2B 220B * PD220 * Class B output, triode B2
PM14 410SG S410 * 4075SG Screened grid, tetrode B4
PM3A 410RC H410 * 4075RC Resistance/capacity coupled amp, triode B4
PM3 410HF HL410 * 4075HF Med. imp. LF or detector, triode B4
PM4DX 410LF L410 * 410D Med. imp. LF or detector, triode B4
PM4 410P P410 * 410P Power output, triode B4
PM254 425XP, 415XP P415, P425 P425 420SP Super power output, triode B4
PM16 610SG S610 * 6075SG Screened grid, tetrode B6
PM5X 610HF HL610 HL610 6075HF Med. imp. LF or detector, triode B6
PM6D 610LF L610 * 610D Med. imp. LF or detector, triode B6
PM256 625P P625 P625B 625SP Super power output, triode B6
PM256A 610XP P625A P625A 625SPA Super power output, triode B6
PM26 615PT PT625 * 617PP Super power output, pentode B6
VP4 * * * HP2AC Screened grid multi-mu HF, tetrode IA4
SP4 MSPen * * HP1AC Screened grid HF amp, tetrode IA4
MM4V MVSG VMS4 AC/SGVM 4MMAC Screened grid amp multi-mu, tetrode IA4
S4VA * * AC/S2 4XSGAC Screened grid amp, tetrode IA4
S4VB MSG/LA MS4, MS/4/B AC/SG 4YSGAC Screened grid amp, tetrode IA4
TDD4 * MHD4 * * LF amp & detector, double diode triode IA4
SD4 * * * * SG LF amp & detector, diode tetrode IA4
904V 41MH * AC2/HL 4DXAC High magnification detector, triode IA4
354V 41MHF MH4 ACHL 4GPAC Detector & general purpose, triode IA4
244V 41MHL MHL4 * 4HLAC General purpose, triode IA4
164V 41MLF * * 4LAC General purpose, triode IA4
Pen4V MPPen * * 4PenAC Power output, tetrode IA4
Pen4VA MPPenA MPT4 ACPen * Power output, tetrode IA4
ACO64 * * * HV 4/1 Output amp, triode DA4
ACO44 4XP PX4 PP3/250 HV 4/2 Output amp, pentode DA4
DO24 * PX25 PP5/400 * Output amp, triode DA4
DO25 620T LS6A * HV 6/5 Output amp, triode DA6
DO26 * * * * Output amp, triode DA4
PM24A * * * 4PenSP Output amp, pentode DA4
PM24M PT41 PT4 * 4PenM Output amp, pentode DA4
PM24D * PT25 * * Output amp, pentode DA4
DO60 660T DA60 * * Output amp, triode DA6
DO75 * * ES75 * Output amp, triode DA10
DW2 506BU U10 UU4 W462 60mA @ 250v, double diode rectifier DA4
DW3 442BU U12 UU120/350 W120/350 120mA @ 350v, double diode rectifier DA4
DW4 460BU U14 UU120/500 W120/500 120mA @ 500v, double diode rectifier DA4
IW2 * * UU2 W60/250 60mA @ 250v, double diode rectifier IA4
IW2A * * UU60/250 IH60/250 75mA @300v, double diode rectifier IA4
IW3 * * * * 120mA @ 350v, double diode rectifier IA4

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