Best AUDIO TUBES listed at:

(click on links below to check stock) 12A / UX-112A / CX-112A Triode 12A4 / 12A5 / 12A6 / 12A7 / 12A8 12Axx Series / 12AE6 12AQ5 / 12AT6 / 12AV5 / 12AW6 12AT7=ECC81 Dual Triode 12AU6 / 12AV6 / 12AV7 / 12AX3 / 12AX4 12AU7=ECC82 Dual Triode 12AX7=ECC83 Dual Triode 12AY7 / 12AZ7 12B4 / 12Bxx Series / 12BA6 / 12BE6 / 12BH7A / 12BY7A / 12BZ7 12Cxx Series / 12DM7 / 12DT8 / 12DQ6B / 12E1 12Fxx Series / 12FM6 / 12FM7 / 12FQ7 12GN7A / 12H6 / 12J5 / / 12Kxx Series / 12Lxx Series / 12Qxxx Series / 12Rxx Series 12SA7 / 12SC7 / 12SF5 / 12SF7 / 12SG7 / 12SH7 / 12SJ7 / 12SK7 12SL7GT / 12SN7GT 12SQ7 / 12SQ7GT / 12SR7GT / 12SX7GT 12T10 / 12U7 Dual Triode / 12W6GT / 12X4 Rectifier / 12Z3
Type 12A / UX-112A / CX-112A Triode - RCA Radiola 16 1928 TO BUY 12A and UX-112

12A4 / 12A5 / 12A6 / 12A7 / 12A8 10) 12A4 US Brands NOS $5 2) 12A5 Philco, Raytheon NOS $4 1) 12A5 Raytheon used $2.50 1) 12A5 National Union used $2.50 8) 12A6 metal can NOS $3 (2) Ken Rad (6) RCA (Collins TCS14 1944) 10) 12A6GT Tungsol NOS 1940's $3.50 10) 12A7 NOS $5.75 (4) RCA 1) 12A7 RCA used $3 2) 12A8G Sylvania NOS $4 6) 12A8GT US Brands NOS $3.25
12AB5 / 12AC6 / 12AD7 (Webcor Hifi) T0 BUY 12AB5
6) 12AC6 NOS $3 0) 12AD7 NOS $40
12AE6 / 12AE6A Twin Diode - Medium-Mu Triode Headroom Millet hybrid headphone amplifier, which also can use 12FK6, 12FM6 T0 BUY 12AE6A
1 tube $6) 12AE6A Raytheon NOS D getter on top 1 tube $6) 12AE6A Raytheon NOS D getter on side 1 tube $7) 12AE6A Tungsol NOS D getter 1 tube $7) 12AE6 RCA NOS D getter white printing early 1950's
12AE7/12AE7A / 12AE10 1) 12AE7 Sylvania NOS $5 1) 12AE7 Philco by Sylvania NOS $5 10) 12AE10 NOS
12AF3 / 12AF6 / 12AH7 8) 12AF3 NOS $3.50 1) 12AF6 NOS $3.50 (2) used $2.25 8) 12AH7GT NOS $5.25 5) 12AJ6 NOS $4.75 2) 12AJ6 used $2.50
12AL5 Full-Wave Rectifier / 12AM8 Magnavox radio T0 BUY 12AL5
8) 12AL5 Telefunken <> NOS $8 1) 12AM8
12AQ5 / 12AT6 / 12AV5 / 12AW6 T0 BUY 12AQ5
6) 12AQ5 used/good $2.50 each T0 BUY 12AT6
12AT6 for (Fada 845) and (Zenith L518 circa 1953) 5) 12AV5GA NOS $3 7) 12AW6 NOS $2.50
12AT7 / ECC81 DUAL TRIODE T0 BUY 12AT7

12AU6 Pentode 1) 12AU6 Telefunken NOS diamond bottom original box $20 (recommended) 4) 12AU6 Telefunken Diamond Bottom "Selected" sticker on tube used/test like new 1960's $7.50 or ($20/matched pair) 10) 12AU6 Sylvania "Selected" used/test like new $3.50 ($10/matched pair) 70) 12AU6 US Brands NOS $3.50 (GE, Raytheon, Sylvania)
12AU7 / ECC82 DUAL TRIODE T0 BUY 12AU7

12AV6 Dual-Diode and High-Mu Triode USED: ---- 10) 12AV6 used/good $3 each
12AV7 Dual Triode (also see 5965 and 7062 listing) T0 BUY 12AV7

12AX3 Compactron Damping Diode (Except for heater characteristics, the 12AX3 is identical to the 6AX3, Irect max = 165ma) - LAMM L2 reference preamp power supply T0 BUY 12AX3

12AX4GTA/GTB Half-Wave Rectifier T0 BUY 12AX4

12AX7=ECC83 DUAL TRIODE T0 BUY 12AX7

12AY7 Dual Triode T0 BUY 12AY7

12AZ7 / 12AZ7A Dual Triode "Black Plates" (similar to 12AT7) McIntosh MC275 1950's: ------ 12AZ7 RCA NOS black plates copper grid posts square getter halo 1950's $25: 2) branded GE 1955 (not exact pair) 1) branded Sylvania 1) branded Tungsol 1) 12AZ7A Sylvania black plates NOS $15 1) 12AZ7A Sylvania black plates branded as Dumont 1960's high gain $15 1) 12AZ7 Sylvania black plates NOS tests 55% 1950's $4.50 12AZ7 black plates used/tested 1950's: 1) RCA "D" getter no printing $10
12AZ7 Dual Triode "Gray Plates" (similiar to 12AT7) GE: -- 1) 12AZ7A GE NOS $12 1) 12AZ7A GE NOS large U getter halo 1950's $30 (recommended) 1) 12AZ7A GE branded as Westinghouse NOS 1970's $12 RAYTHEON/RCA/TUNGSOL: -------------------- 1) 12AZ7A Tungsol gray plates copper grid posts "o" getter halo 1960's $20 JAPAN: ----- 1) 12AZ7 Raytheon JAPAN NOS 1960's $6
12B4/A Low-Mu Triode TO BUY 12B4A pairs

12B8GT 1) 12B8GT used $5
12BA6=HF93 Pentode Emerson 587 radio 1951 T0 BUY 12BA6 NOS
30) 12BA6 US Brands used/test good $3 ea
12BA7 / 12BD6 20) 12BA7 US Brands NOS $3 1) 12BD6 RCA NOS $6
12BE6=HK90 Heptode / 12BF6 T0 BUY 12BE6
1) 12BE6 Telefunken NOS no diamond probably made by Siemens in Tele box $12 1) 12BE6 GE NOS $6.50 1) 12BE6 Sylvania NOS $6.50 1) 12BE6 RCA NOS $6.50 4) 12BE6 GE branded Brimar England NOS in white boxes $6.50 3) 12BE6 US Brands used/test like new $4.50 50) 12BE6 US Brands used/test good $3.50 12BE6 JAPAN: ----------- 1) 12BE6 Raytheon JAPAN NOS $4.75 1) 12BE6 Matsushita JAPAN NOS perfect printing $5.50 1) 12BE6 Hitachi JAPAN used/tests like new $3.50 6) 12BF6 NOS $3SPECIAL 6 for $12
12BH7/A Dual Triode T0 BUY 12BH7A

12BL6 8) 12BL6 used/test good $2
12BQ6GT / 12BQ6GTB 10) 12BQ6GT NOS $3 25) 12BQ6GTB NOS $3 4) 12BQ6GTB used/good $2
12BY7A=12BV7 Sharp Cutoff Pentode (Gm=13ma/V for 12BY7A, Gm=12ma/V for 12BV7, Power=6.5 watts max) Heathkit DX-35 1950's Kenwood TS-830S Transceiver Kenwood 520 Kenwood TS-20 Yaesu FT-101 Transceiver GE: -- TO BUY 12BY7A GE NOS
RCA: --- TO BUY 12BY7A RCA NOS
1) 12BY7A RCA "Tektronix Checked" tests like new 1960's $12 1) 12BY7A RCA "Tektronix Checked" NOS 1970's $15 1) 12BY7A RCA gray coated glass NOS "U" getter halo 1950's $15 7) 12BV7=12BY7A RCA NOS $11.50 (7 for $69) SYLVANIA: -------- TO BUY 12BY7A Sylvania NOS
WESTINGHOUSE: ------------ TO BUY 12BY7A Westinghouse NOS pairs
USED: ---- 35) 12BY7A US BRANDS used/test good $5.75 ea (6) Sylvania (2) Raytheon (8) RCA or
12BZ7 High-Mu Dual Triode (Max ratings: 300Vplate, 1.5 watts) (Vfil=12.6V @ 300ma) (Typical Operation Class A amp: Vplate=250V, Vgrid=-2V, Ip=2.5ma, Rp=31.8Kohms, Gm=3200, Mu=100) (The 12BZ7 has been subbed for a 12AX7 in some circuits) (The 12BZ7 has 2 times the Gm (3200 versus 1600) and lower plate resistance (31K versus 62K) and higher filament current (300ma versus 150ma) than a 12AX7) (The 12BZ7 was designed primarily for use as a sync separator and sync amplifier in television receivers. It is also useful in clipping circuits and as a general purpose audio amplifer) - Cary V12R amp - Cary PH-301 phono - Cary Rocket 88R - Audio Electronics Supply/Cary Six Pacs TO BUY 12BZ7 NOS pairs
12BZ7 RCA gray plates NOS: ------------------------- listed below - 2 different box styles 1 platinum pair $35) 12BZ7 RCA gray plates NOS 1968 same date codes 1 tube) Gm=3030/3050 1 tube) Gm=3025/3100 1 platinum pair $35) 12BZ7 RCA gray plates NOS 1968 same date codes 1 tube) Gm=3310/3370 1 tube) Gm=3290/3360 1 platinum pair $35) 12BZ7 RCA gray plates NOS 1968 same date codes 1 tube) Gm=3270/3310 1 tube) Gm=3300/3340 1 platinum pair $35) 12BZ7 RCA gray plates NOS 1960's same date codes 1 tube) Gm=3090/3200 1964 1 tube) Gm=3100/3170 1968 1 platinum pair $35) 12BZ7 RCA gray plates NOS 1960's same date codes 1 tube) Gm=3050/3130 1966 1 tube) Gm=3100/3140 1968 2 pairs) 12BZ7 RCA gray plates NOS 1960's 1 pair $35) Gm=3260/3390 and 3270/3400 1964 and 1968 1 pair $35) Gm=3310/3410 and 3300/3370 1968 and 1968 3 low noise pairs $50/pair) 12BZ7 RCA "Kuhl-Tube" cryo treated for 36 hrs Gray Plates NOS 1960's (recommended, best RCA pairs) 12BZ7 RCA gray plates NOS: ------------------------ 1 tube $15) 12BZ7 RCA gray plates NOS 1960's 1 tube $11) 12BZ7 RCA gray plates NOS branded GE 1960's loose mica piece inside tube, tube works fine 12BZ7 US brands used/good $6: ---------------------------- 2) RCA gray plates 1) Nat. Union branded CBS Columbia 1) CBS black plates
12C8 / 12CT8 8) 12C8 NOS $3 15) 12CT8 NOS $3
12D4 / 12DB5 / 12DM7 Dual Triode 2) 12D4 NOS $3 5) 12DB5 GE NOS $3 0) 12DM7 NOS (replacement for 12AX7)
12DT8 Dual Triode (similar to 12AT7) - Don Allen - Zenith L727 radio 1959 1) 12DT8 RCA black plates D getter halo NOS 1950's $25 1) 12DT8 Sylvania black plates NOS 1970 $25 1) 12DT8 RCA gray plates NOS around 1970 $20 (106/50 and 110/50) 1) 12DT8 RCA gray plates NOS around 1970 $15 (82/50 and 86/50) 1) 12DT8 Sylvania gray plates NOS rebranded Tungsol 1960's $20
12DQ6A/B=12GW6 3) 12DQ6 US Brands NOS $9 10) 12DQ6A US Brands NOS $9 18) 12DQ6B US Brands NOS $10.50 3) 12DQ6B used $5.25
12DW7=7247 Dual Triode TO BUY 12DW7=7247

12DQ7 / 12DZ6 1) 12DQ7 RCA NOS $6 2) 12DZ6=12EA6 $6
12E1 Tetrode / 12EG6 / 12EM6 1) 12E1=CV345 AEI England black plate bottom getter NOS brown base $25 1) 12E1=CV345 STC England gray plate side getter NOS brown base $25 5) 12EG6 NOS $5 6) 12EM6 NOS $4.50
12F5GT / 12FK6 / 12FM6 / 12FM8 6) 12F5GT NOS $3 0) 12FK6 1) 12FM6 CBS NOS D getter 1959 $10 1) 12FM6 RCA NOS D getter 1950's $10 1) 12FM6 GE branded RCA NOS D getter 1950's $10 1) 12FM6 Raytheon NOS D getter 1950's $10 1) 12FM6 Tungsol NOS large U getter $10 100) 12FM8 US Brands used/pullouts $1 each
12FQ7 Dual Triode (12FQ7 is a 6FQ7 with a 12V filament) - Quicksilver Audio V4 mono amp - Quicksilver M-135 amp single tubes: ------------ 1) 12FQ7 GE NOS mismatched triode sections by 25% $8 1) 12FQ7 Matsushita Japan used/good $4.50
12FQ8 / 12FR8 / 12FX8 100) 12FQ8 US Brands used/good, many are 1950's $3.95 0) 12FR8 NOS $12 2) 12FX5 NOS $4.50 2) 12FX8A GE NOS $3.50 1) 12GB3 NOS $6
12GN7A/12HG7 Pentode (12HG7=ruggedized frame-grid version of 12BY7A, uprated to 10 watts) TO BUY 12HG7=12GN7A
3) 12GN7A/12HG7 US brands used/low hours $4 (1) RCA 3) 12GN7A/12HG7 JAPAN used/test good $2.25 1) 12GN7A/12HG7 RCA clear top NOS $10 2) 12GW6=12DQ6B NOS $11
12H6 8) 12H6 NOS metal can $3.40
12J5/GT Triode - Transition Audio Design custom phono preamp 2010 metal can: --------- 2) 12J5 GE metal can NOS $5 ea glass: ----- 1 pair $25) 12J5GT RCA NOS 1970 1 pair $20) 12J5GT NOS same internals in white boxes 1940's - 1950's: 1 tube) Ken Rad 1 tube) Hytron made by Ken Rad 1 tube $12) VT-135=12J5GT RCA NOS 1940's 1 tube $12) VT-135=12J5GT Sylvania NOS 1940's 1 tube $12) 12J5GT Tungsol NOS 1940's 1 tube $10) 12J5GT RCA NOS 1970 1 tube $12) JAN-CNU-12J5GT Nat. Union Black Ribbed Plate NOS 1940's
12J7GT 5) 12J7GT NOS $5 each
12J8 / 12JB6/A / 12JN6 / 12JT6 3) 12J8 GE NOS $2.65 0) 12JB6 NOS $20 0) 12JB6A NOS $20 7) 12JN6 NOS $4.50 (5) GE (2) Dumont 2) 12JN8 Dumont NOS $3 4) 12JQ6 GE NOS $8 12) 12JT6A NOS $5.50
12K7GT / 12K8 / 12L6GT / 12Q7GT / 12R5 1) 12K7G Sylvania NOS $6 4) 12K7GT NOS $4 20) 12K8Y NOS $3 (5) RCA 20) 12L6GT US Brands NOS $3.25 1) 12Q7 metal NOS $4 1) 12Q7G National Union NOS $5 2) 12Q7G NOS $5 3) 12Q7GT US Brands NOS $4 5) 12R5 NOS $3 (5 for $12)
12S8 3) 12S8GT NOS $3
12SA7 metal can / 12SA7GT glass - Belmont Radio 6D120 1947 - GE 436 radio 1954 T0 BUY 12SA7
12SA7 metal: ----------- 1) 12SA7 GE metal used/60-65% $4 12SA7GT glass: ------------- 2) 12SA7GT National Union NOS no printing in white boxes 1940's $6 4) 12SA7GT used/good $4
12SC7 Dual-Triode (12SC7=12SL7GT in a metal can with common cathode for both triode sections) (also see 1634 which is a premium 12SC7 with matched sections) - Mapletree Ultra 4A preamp 2 pairs $20/pair) 12SC7 International Canada NOS, probably made by GE SINGLE TUBES: ------------ 1) 12SC7 Raytheon NOS 1950's $7.50 2) 12SC7 RCA NOS 1948 $7.50 (not a pair) 1) 12SC7 Ken Rad NOS 1940's $7.50
12SF5 / 12SF5GT / 12SF7 10) 12SF5 National Union NOS metal can $3.50 9) 12SF5GT US Brands NOS $5 (2) Nat. Union (4) Sylvania 9) 12SF7 US Brands NOS $5
12SG7 metal can 3) 12SG7 NOS $5 12) 12SG7 used $3
12SH7 metal can 2) 12SH7 NOS $5.50
12SJ7 metal can - Westinghouse radio - Silvertone amp 12SJ7 metal can NOS $4 ea or (4 for $14): (2) GE branded Executone (5) Sylvania (3) GE (5) United by RCA or GE (2) RCA
12SK7 metal / 12SK7GT glass Collins TCS14 1944 12SK7 metal can: --------------- 5 tubes $6.25 ea) JAN-CRC-12SK7 RCA NOS 1940's 1 tube $6.50) 12SK7 RCA metal NOS 1940 1 tube $6.50) 12SK7 GE metal NOS rebranded International 1 tube $4.25) 12SK7 Ken Rad metal used/good 1940's 1 tube $4.25) 12SK7 Raytheon used/good 1956 1 tube $4.25) JAN-CLRV-12SK7Y Marconi Canada 1959 used/good 12SK7GT glass: ------------- 1) 12SK7GT Tungsol used/tests like new 1940's, 50% of base is rusted/tarnished $3 (70/48) 1) 12SK7GT Triad by Sylvania chrome top used/70% 1950's $4 (60/48) 1) 12SK7GT Dumont NOS/70% original box around 1960 $4 (60/48) 1) 12SK7GT Hytron used/70% 1946 $4 (60/48)
12SL7GT=VT-289 Dual Triode - Tom McNally Darling amp 2009 TO BUY 12SL7GT
single tubes: ------------ 1) Sylvania 1970's $10 1) Sylvania branded GE NOS 1960's $12 1) Sylvania branded RCA NOS 1960's $12 1) Sylvania chrome top short bottle gray plates 1953 $15 1) Sylvania rebranded Tungsol 1951 with mismatched triode sections by 20-25% $8 12SL7GT US Brands NOS coin/wafer base: ------------------------------------- 2 pairs $25/pair) Sylvania coin-base NOS 1970's (best value) 12SL7GT USED: ------------ 1) 12SL7GT Sylvania chrome top used/tests 60% 1950's $3 1) 12SL7GT RCA used/tests very good mid-1940's $7.50
12SN7GT/A / 12SN7GTB Dual Triode (replace a 12SN7GT with a low noise 12SX7GT for improved sound) - Mapletree - McAlister Audio MA-10 - Tom Tutay preamp TO BUY 12SN7GT
CANADA: ------ 1) 12SN7GT Rogers Canada used/good 1957 original box $6 GE: -- 1 Low Noise tube $10) 12SN7GTA GE side getter NOS branded Amperex 1970, filament wire at top 1 tube $6 12SN7GTA GE side getter used/tests good 1956 RCA: --- 1) 12SN7GT RCA black base/black plates NOS 1950's white printing $15 1) 12SN7GTA RCA NOS 1950's rebranded Amperex in 1970 $12 US BRANDS USED: -------------- 10) 12SN7GTA US Brands used/test good $5 each or (10 for $25 used as-is)
12SQ7 metal can / 12SQ7GT glass Hallicrafters S-38 radio GE 422 radio 1951 GE 436 radio 1954 12SQ7 metal can: --------------- 1) 12SQ7 Tungsol metal NOS $10 3) 12SQ7 RCA metal NOS $10 ea 0) 12SQ7 metal used 12SQ7GT glass: ------------- 1) 12SQ7GT Hytron used/good 1950's $5 1) 12SQ7GT National Union used/good 1940's $5 1) 12SQ7GT RCA NOS 1950's broken guide pin $3.50
12SR7 metal can / 12SR7GT glass 6) 12SR7 metal can NOS $4 (2) RCA (2) Ken Rad (2) Mat. Union 6) JAN-CTL-12SR7GT Tungsol NOS 1940's $5 (4 for $18)
12SX7GT Dual Triode (upgrade your 12SN7 to these for improved sound) (Vplate=250V, Vgrid=-8V, Mu=20, Gm=2600, Rp=7700ohms, Iplate=9ma) (Max plate voltage=300V) - Mapletree Audio Line 2A SE 2007 - Mapletree Audio Line 2B - Mapletree Audio Ultra 4A SE preamp - Tube Research Dude preamp - Cavalli Liquid Glass 2013 TO BUY 12SX7GT

12T10 / 12U7 Dual Triode 3) 12T10 GE NOS $7 0) 12U7
12V6GT Pentode 8) 12V6GT NOS (6) GE $5.50 ($16/matched pair, 2 pairs) 1 pair $20) 12V6GT Tungsol NOS 1950's (recommended)
12W6GT 0) 12W6GT US Brands NOS 5) 12W6GT US Brands used/good $2.75 ea
12X4 Rectifier - Dynaco PAS-2, PAS-3 - Juicy Music Peach II pre-amp - car radios TO BUY 12X4

12Z3 13) 12Z3 NOS $3:SPECIAL 10 for $15 NOS as-is (2) Philco (5) RCA
for 13CW4 -> 35Z6 STOCK