Best EL37 listed at

EL37 Mullard 1950's - 1960's (some branded Philips or Philips Miniwatt) (click on links below to check stock) EL37=CV586 Mullard brown base 1955-1962 EL37 Mullard black base / black plate 1955-1957 EL37 Mullard black base / black plate 1958-1960 EL37 Mullard black base / gray plate 1955-1967

(EL37 Mullard is a 25 watt audio output power pentode. Other similar substitutions are 6L6GC, 5881, KT66, 5932) (Check with your equipment manufacturer before substituting a EL37 for a 6L6GC or KT66) (EL37 plate and screen voltage should not exceed 400 VDC) (Vfil=6.3 @ 1.4A)


EL37 Mullard "BROWN BASE" 1950's - 1960's (brown base EL37 have same great sound as black base EL37) (Vplate=450V, Vgrid=-12V, Vscreen=200V) (buy 2 tubes receive 5% discount) BLACK PLATE: ----------- 1 tube $225) CV586=EL37 NOS black plate, 2 round getter halos 1958 (60.5ma) 1 tube $225) CV586=EL37 NOS black plate, 1 cup shape getter halo 1955 (53ma) 1 tube $225) CV586=EL37 NOS black plate, 1 cup shape getter halo 1955 (65ma) GRAY PLATE: ---------- 1 tube $210) EL37 NOS gray plate, 2 round getter halos 1966 (52ma) 1 tube $210) CV586=EL37 NOS gray plate, 2 round getter halos 1962 (60ma) 1 tube $210) CV586=EL37 NOS gray plate, 2 round getter halos 1962 (67ma)

1 tube $95) EL37 Mullard gray plate NOS/65% output, 2 round getter halos 1960's (41ma)


EL37 Mullard "BLACK BASE" and "BLACK PLATE" 1955-1957 (Vplate=450V, Vgrid=-12V, Vscreen=200V) EL37 NOS black plate, 1 upside-down "cup shape" getter halo: ----------------------------------------------------------- listed below 1 tube $260) EL37 NOS black plate, 1 upside-down "cup shape" getter halo 1955 (76ma) (best single - recommended) listed below 1 tube $260) EL37 NOS black plate, 1 upside-down "cup shape" getter halo mid-1950's (60.2ma) EL37 gray plate, 1 upside-down "cup shape" getter halo: ------------------------------------------------------ listed below 1 tube $255) EL37 NOS gray plate, branded Philips Miniwatt, 1 upside-down "cup shape" getter halo mid-1950's (59.5ma) listed below 1 tube $215) EL37 Mullard low hours/like new gray plate, 1 upside-down "cup shape" getter halo, getter like new, mid-1950's (63ma) EL37 MULLARD BLACK PLATE USED, 2 upside-down "cup shape" getter halos: --------------------------------------------------------------------- 1 pair $449) EL37 Mullard black plate like new, 2 upside-down "cup shape" getter halos, (R61-B6K=1956), good getters, fair printing (best pair and oldest pair) 1 tube) 57ma 1 tube) 55ma listed below 1 tube $150) EL37 Mullard used/good, 2 upside-down "cup shape" getter halos, (R61-B7A=1957), good getters, fair printing (50ma) - good value listed below 1 tube $45) EL37 Mullard used/50%, 2 upside-down "cup shape" getter halos, (R61-B6L=1956) getter like new, some printing (36.5ma) Gm=6000
EL37 Mullard "BLACK BASE" and "BLACK PLATE" 1957 - 1960 - CARR MERCURY 2003 - Fisher 80-AZ EL37 MULLARD BLACK BASE with BLACK PLATE NOS: -------------------------------------------- 1 tube $225) EL37 Mullard NOS black plate, 2 round getter halos 1960 (53.6ma) 1 tube $225) EL37 Mullard NOS black plate, 2 round getter halos, around 1960, can't read date code (51.5ma) 1 tube $210) EL37 Mullard NOS black plate, 2 round getter halos 1960 (50ma) EL37 Mullard "round" getter halos USED: -------------------------------------- BLACK PLATE: ----------- listed below 1 tube $175) EL37 Mullard black plate low hours/tests very good, getters like new, 2 round getter halos fair printing (R61-B7J=1957) (60ma) listed below 1 tube $150) EL37 Mullard black plate low hours/tests very good, getters like new, 2 round getter halos faded printing (R61-B7J=1957) (53.1ma) Gm=10,500 - good value
EL37 Mullard "BLACK BASE" and "GRAY PLATE" late 1950's - 1960's listed below 1 platinum pair $419) EL37 Mullard NOS rebranded HALTRON in HALTRON boxes can't read date codes - early to mid 1960's (recommended pair) 1 tube) 66.5 1 tube) 65ma EL37 MULLARD GRAY PLATE NOS: --------------------------- 1 tube $210) EL37 Mullard branded HALTRON NOS gray plate, 2 round getter halos 1960's in Haltron boxes (70ma) 1 tube $210) EL37 Mullard NOS gray plate, 2 round getter halos 1962 (63.3ma) 1 tube $210) EL37 Mullard NOS gray plate, 2 round getter halos 1966 (68.5ma) GRAY PLATE USED: --------------- 1 pair $375) EL37 Mullard used/test like new, gray plate, 1 upside-down "cup shape" getter halo mid-1950's, some printing on each tube (recommended) 1 tube) 62.5ma 1 tube) 64.1ma listed below 1 tube $150) EL37 Mullard rebranded Amperex Globe Logo orange printing, used/tests like new, gray plate, very good printing, large getters like new, 2 round getter halos, 4 vertical clamp scratches on base 1969 (55ma) listed below 1 tube $150) EL37 Mullard used/tests like new, gray plate, 2 round getter halos very good printing, slightly faded getters 1963 (58ma)
EL37 MULLARD ENGLAND (The EL37 are sonically between a EL34 Mullard and GE 6L6GC; strong and punchy with good richness and complexity in the midrange, probably the best 6L6) - Dared VP-20 amps Customer Comments: ----------------- "Just wanted to follow on our conversation yesterday on the Mullard EL37's you sold me. ALL IS WELL AND ALL IS GREAT!!! I found the match in a '64 Deluxe Reverb that I thought sounded great with NOS 5881's, but let me tell you....the EL37's are a different thing...WOW!....THE TONE IS AMAZING! Also and FYI if any of your customers run into the bias issue I did in a Twin Reverb and other bias potted Fenders (lack of ample current). Change the resistor that runs across the bias pot to a higher (or Lower) resistance (mine: 15 ohm to 22 ohm). Thanks from a satisfied customer."

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EL37 MAX RATINGS PENTODE CONNECTED: ---------------------------------- Vplate = 400VDC Vscreen = 400VDC Pout plate max = 25 watts Pout screen max = 6 watts Iplate max = 200ma OPERATIMNG CONDITIONS: --------------------- (2) EL37 in PUSH-PULL CONFIGURATION (FIXED BIAS) Vplate = 400V Vscreen = 400V Iplate = 50ma Iscreen = 6ma Vgrid = -36V Rplate-plate= 3250 ohms Pout = 69 watts (2) EL37 in TRIODE CONFIGURATION (SELF BIAS) Vplate = 400V Iplate = 70ma Iscreen = 6ma Vgrid = -36V Rplate-plate= 4000 ohms Pout = 20.6 watts