Best 5814A listed at:

5814 / 5814A / 5814WA (12AU7 Substitute) (the 5814A is equivalent to a 12AU7WA, it is ruggedized and redesigned; the filament current raised to 175ma per section versus 150ma per section for a 12AU7. 5814A is computer rated, 5814WA is ruggedized)
(click on links below to check stock) 5814 / 5814A GE 1950's - 1970's 5814A GE JAN 1960's - 1970's 5814A Marconi Canada 5814A Raytheon 5184A RCA Black Plates 5184A Siemens Germany 5184A Sylvania
5814 / 5814A / 5814WA GE 1953 - 1970's (5814A is a direct substitute and a ruggedized 12AU7, also see 5963 and 6189) (The best 5814A are Siemens Germany, RCA black plates and JG or 5 Star GE) - Woo Audio WA4 headphone amp - TRON Seven phono (can only use 5814WA only) - Bottlehead Crack TO BUY 5814A GE
5814 and 5814A 1950's: --------------------- 1 low noise tube $70) 5814A GE NOS "gray pinched plates", triple mica, "U" getter halo, copper grid posts, 1950's in white box (11.6/12.2ma) (recommended) * (Gm=1465/1515) 1 low noise tube $65) JG-5814 GE like new/pins cleaned "short wide ribbed black plates", "D" getter halo, copper grid posts, 1952-1953, in white box (11.4/11.9ma) (recommended) * (Gm=1440/1485) 1 low noise tube $59) JG-5814A GE used/like new "gray pinched plates", triple mica, "U" getter halo, copper grid posts, (5-13=1955) in white box (11.5/12.1ma) (recommended) * (Gm=1465/1500) 1 low noise tube $59) JG-5814WA GE NOS "gray pinched plates", triple mica, "U" getter halo, copper grid posts, (56-22==1956) in 1957 box (11.5/12.2ma) (recommended) * (Gm=1450/1515) 1 low noise tube $39) 5814A GE used/good "gray pinched plates", triple mica, "U" getter halo, copper grid posts, (55-40==1955) in white box (Gm=1370/1490) 1 low noise tube $45) JG-5814 GE used/good "black ribbed plates plates", double mica, "D" getter halo, copper grid posts 1952-1953 in white box (Gm=1385/1510) 1 low noise tube slightly microphonic $39) JG-5814 GE NOS "short wide ribbed dark gray plates", "D" getter halo, copper grid posts (3-09=1953) (10.8/11.5ma) (recommended) * (Gm=1380/1450) 1960's - 1970's: --------------- 1 platinum low noise pair $110) JG-5814A GE NOS "gray plates triple mica "O" getter halo" 1960-1961 1 tube) JG-5814WA (Gm=1395/1420) 1960-1961 1 tube) JG-5814A (Gm=1400/1420) 1959-1960 1 platinum low noise pair $60) 5814A GE NOS 1960's 1 tube) (Gm=1460/1520) 1 tube) (Gm=1475/1510) 1 platinum low noise tube $55) JG-5814A GE NOS "gray plates triple mica "O" getter halo" 1961 (Gm=1475/1490) 1 platinum low noise tube $45) JG-5814A GE NOS "gray plates double mica "O" getter halo" 1966 (Gm=1450/1460) best single 1 platinum low noise tube $40) JG-5814A GE NOS "gray plates double mica "O" getter halo" 1963 (Gm=1475/1515) 1 low noise tube $40) 5814A GE "5 Star" NOS 1963 red printing slightly faded (Gm=1440/1510) 1 platinum low noise tube $35) JG-5814A GE NOS "gray plates double mica "O" getter halo" 1968 (Gm=1460/1470) best single 1 low noise tube $35) JG-5814A GE NOS "gray plates double mica "O" getter halo" 1965 (Gm=1400/1460) 1 platinum low noise tube $28) 5814A GE "5 Star" used/like new 1960's (Gm=1400/1420)
5814A GE JAN 1960's - 1980's (green printing) 5814A GE JAN 1970's - 1980's: ---------------------------- 3) 5814A GE JAN NOS 1970's $20 each or $45/matched pair, 1 pair 6) 5814A GE JAN NOS 1980's $15 each or $35/matched pair, 2 pairs 1) 5814A GE JAN NOS 70-75% $5 2) 5814A GE JAN NOS 60-65% $4 1 low noise tube $30) JAN-5814A GE NOS 1970 green printing 1 low noise tube $20) JAN-5814A GE NOS 1979 green printing
5814A=12AU7 Marconi Canada 1950's TO BUY 5814A Marconi
3 low noise pairs $85/pair) 5814A Marconi Canada NOS gray plates - triple mica - large "U" getter halo - original boxes - mid-1950's - best value
5814A=12AU7 Raytheon 1955 - Bottlehead Foreplay - CJ PV12 - Jadis amp TO BUY 5814A Raytheon

5814A=12AU7 RCA 1950 - 1970's (recommended, great sounding sub for 12AU7, low noise, sweet sound, great bass) 1950's -1960 triple mica: ------------------------ 1 platinum low noise tube $45) 5814A RCA "Black Plates and Triple Mica" used/good with "D" getter halo 1950's - smeared red printing (10.8/10.9ma) (Gm=1495/1500) 1 low noise tube $40) 5814A RCA "Black Plates and Triple Mica" used/good with "D" getter halo 1956 (10/10.6ma) (Gm=1410/1450) 1960's - 1970's: smooth sound --------------- PAIRS: ----- TO BUY 5814A RCA
4 low noise pairs $75/pair) 5814A RCA black plates double mica 1970's original boxes (best value) SINGLE TUBES: double mica ------------ 0 platinum low noise tube $75) JRC-5814A RCA black plates double mica 1962 original box - fair printing (13/13.4ma) best single 0 platinum low noise tube $70) JRC-5814A RCA black plates double mica 1965 original box - some printing (12/12.8ma) best single 0 platinum low noise tube $70) JRC-5814WB RCA black plates double mica 1965 original box - fair printing (11.5/12ma) 0 low noise tube $60) 5814A RCA "black plates" NOS early-1960's (12.5/13.5ma) 0 low noise tube $45) 5814A RCA "black plates" NOS 1970's SONIC COMMENTS: -------------- "Dear Brendan, I originally called you about getting a replacement pair of Siemens 5814, being used in a Sonic Frontier amplifier, with Western Electric 300B. You had stated that the Siemens would give the most accurate reproduction of the 300B. But, you went on to further recommend that if I wanted a little more warmth and a little more richness in the upper end, that I would try a pair of RCA-Circa 1950s 5814. It was a wonderful recommendation, it makes the amp sound more lively, definitely a richer tone and gives a nicer roundness that we didn't have with the Siemens's. So once again, thank you for you help. Sincerely, Peter Lee"
5814A=12AU7 Siemens West Germany (very transparent 12AU7 sub, lots of inner detail, airy highs, this tube is very neutral, reference quality) (recommended for DACS and linestages) (also see E82CC Siemens and 12AU7 Siemens) - Unison Research Unico-P 2005 - Einstein preamp - Head-Direct EF1 Hybrid Headphone Amp 2008 TO BUY 5814A Siemens
E82CC=5814A Siemens 1980: best value ------------------ E82CC=12AU7WA Siemens "long plates" NOS triple mica in white boxes 1980 (these tubes are 5814A Siemens from 1980 rebranded "E82CC") 1 Platinum Pair $95) 10.7/11.1ma and 10.5/11ma (recommended) 1 tube $50) 12.1/12.9ma 1 tube $40) 10.6/12.5ma
5814A=12AU7 Sylvania / Philips USA - Acoustic Masterpiece AM201 TO BUY 5814A Sylvania