Sony
Industry major with a million factories linked, assembled & reorganized many times.
The last reorganization, outlined in march 2000, brought an end to the mayhem with an ubiquitous "S. EMCS" T-tag which means Sony Engineering, Manufacturing and Customer Services.
The factories consolidated/united into EMCS on april 1, 2001, were :
Sony Senmaya Corp. Iwate Prefecture
Sony Nakaniida Corp. Miyagi Prefecture
Sony Kitakanto Corp. Ibaraki Prefecture
Sony Bonson Corp. Saitama Prefecture
Sony Kisarazu Corp. Chiba Prefecture
Sony Digital Products Inc. Nagano Prefecture
Sony Broadcast Products Corp. Shizuoka Prefecture
Sony Kohda Corp. Aichi Prefecture
Sony Ichinomiya Corp.Aichi Prefecture
Sony Densi Corp. Aichi Prefecture
Sony Inazawa Corp. Aichi Prefecture
Sony Mizunami Corp. Gifu Prefecture
Sony Minokamo Corp.Gifu Prefecture
With 12,000 employees, a sales revenue of 1,5 Trillon ¥ and an HQ located in Shinagawa Ku, Tokyo, this ensemble was later expanded to Sony Malaysia, or SOEM). Since then, however, actual manufacturing has dwindled to much less...
Sony started to outsource manufacturing in Korea and Taiwan around 1977 but that remained very marginal, delegated to low-low-end things only (TA-F3A,TC-U2 and below, ST-A35, ICF-9740, RT-5) : Sony always had a fairly strict rule regarding the "Made In Japan" reality and the jobs this allowed to keep "at home". However, after the mid 1980s, and mostly the early 1990s, Taiwan, Korea and China were used regularily (but still : on the side only, unlike most other brands). Below, one example of the few Sony made outside Japan :
The overwhelming majority of the Sony T-tags between c. 1966 and 1989 have a common visual structure :
the four letters (ASCO, IZDK, SOAU, SKKC, KGDS etc) are set in between two lines, one above and one below ; the font itself is a customized and bold Eurostile Extended.
Sony
(generic tag between the 1960s and 1977/78 depending on series ; used for ELcaset, amps, receivers, tuners etc. The first few hundred TA-D88 were tagged "Sony", all the later ones "ASCO". Same for the PS-X9 which went from "Sony" to "DTKK" (Sony Daitoh) after about 500 were made.
ASCO
Sony Audio Specialty COmpany, located in the Chiba prefecture ; the name of the actual plant was "Togane".
Unlike other plants, ASCO also was under direct corporate/marketing control and I'm sure some components with an ASCO tag were actually made outside Togane, elsewhere in the Sony galaxy.
As a plant, ASCO was between 1971 and 1981 dedicated to quality audio : ES, ESII, V-Fet, pre-Esprit, 1979-1980 ESPRIT, all export STR receivers. The ASCo tag is one of the few T-tags which was kept on exported (and generally high-end) components between late 1977 and 1979.
The ASCO operation was gradually merged into SOAU between 1980 and 1981, depending on lineups ; the Togane plant is still active for Sony.
Below, the "ASCo" sticker on a TA-N88 :
Below, the "ASCo" sticker on a TA-P7F :
SOAU
SOny AUdio ; audio at large between 1974 and continuing after the efficient 1980/81 reorganization by Masao Morita (a relative of Akio). Falcon, Precise, PS-2800, 1980s ES, FH-7 & PS-Q7, turntables, everything, 1981-1984 ESPRIT, CDP-R1 & DAS-R1.
The earliest SOAU T-Tags I could spot are on some PSE-2500, TTS-2400, PS-2400, ST-5090 but also the HPS-600, MJ-100K, TA-501, PS-501, PS-300 and HMK-50 (the 2400/2500/5090 should normally have been part of ASCO).
SOAU was replaced at the very end of the 1980s by the more specific Sony BP, DP, TB, Kitakanto, Nagano TT etc.
Below, the "SOAU" sticker put on the first hundred TA-E901s to cover the "ASCO" tag here denotes a c. spring 1981 transition between ASCO and SOAU :
Below, the "Sony AU" tag later in the 1980s, doing away with the 1970s tag design and conforming to the new two-letter postfix denomination (Sony AU /BP /DP /TB etc) :
S.Kitakanto
Main 1995/1999 audio plant until the S.EMCS unification.
Top-flight ES, series "1" & 5000/3000 (SCD-1, TA-E1 /N1, CDP-X5000 /X3000, TA-F5000 /F3000 etc), one (big) run of DTC-2000ES but also broadcast and studio/pro (PCM-R700, CDP-3100, CDR-W33, DPS series, MDS-B3, SRP-P50.
Below, the "Iwate TKR" and "Sony Kitakanto" tags on pro/broadcast units :
Sony DP
Digital Products ; R1 & R10, ES amps & tuners, 1000ESD & 2000ESD, CDP/TCK/STS/TAF-ESA/ESL/ESJ series.
Sony BP
Broadcast Products ; mainly the broadcast/studio gear, from the LDP-1500, PCM-7000 /E7700 series, the DSR, DV-Cam, to the Betacam /DigiBeta /DVW series. Audio-wise, the top-of-the-top flight ES/DAT/CDPs, CDP-R3 /R1a /X777ES and MUSE HIL-C1 /2 /3 LDPs [the C2 having seen a Panasonic version as LX-HD20]).
Sony Tsukuba
Sony TB or SOTB originally. The first item I could spot are the TC-357B, then the batteries for the TC-510-2 but SOTB became one of the main plants after 1979 for k7 like last run of TC-K88, TC-FX6, PCM-F1, last run of PS-FL770, PS-X555ES, ES series at large like DTC-ZA5ES or 1990s broadcast & pro like PCM-7010F /2700A, DPS-R7...
Below, the "Sony TB" tag on a TC-357B :
IZDK (TA-1120F /3130F /3140F /4300F /3200F /1130 /5650 /5550 /F45, HA-55 ; possibly the Sansui AT-15S as well [?])
M.IZUMI (probably the same as IZDK ; intermediate TA-N86 & TA-F55 runs between the original ASCO and the later SOAU, second TA-D900 run, SEH-310)
Nagano TT
ES, amps, tuners, TTS, EQs, audio at large since at least the TA-1090 and YJ-200, through the TC-K7B /K8B and up to the TA-F555ESR period.
Nagano KK
Probably a temporary outfit which I have spotted only on the ST-SA50ES, the quite cheaper version [inside] of the big ST-SA5ES.
S. Kohda or "SOKD" (main LDP plant up to the MDP-999 : consumer and pro LDPs, broadcast video ; lower-end Beta, DHR-1000)
S. Kisarazu (Beta, most of the VHS/S-VHS/miniDV/DVD and LDPs ; although now operated by the EMCS outfit, Kisarazu has become the main non-Malaysian Sony Plant.)
Taiheyo K (several ESA CDPs ; bought from Yamaha c. 1989/90 [?] to become a Sony subsidiary.)
Konishi D (last run of TA-D900, a few TA-E901 ; small Sony subsidiary.)
(no idea what scripting was blanked out by the blank sticker right of the T...)
S Nakanida (or "Nakaniida" ; luxury portable items such as the D-3000 "Celebrity" designed by Giugiaro, under the Sony Family Club Inc. marketing outfit, later renamed SME Families Inc.
Sony BN MD-7000 upped version of the D-3000, with a MiniDisc unit added and garnering a JP Good Design award ; custom order from the Sony Music Group [SMG] for its 30th birthday in 1998, still with the old CBS logo and selling like the original D-3000 extremely well.)
Sony IT (CDPs like CDP-991, TA-F510R...)
Ikari KK (last run of TA-NR1 and first run of CDP-R10 ; complete runs of the TA-ER1 + RPS-ER1, SAT-55GRX /100GRX, TA-FA3ES)
Sony Magnescale (established 1965 for production of instrumentation, magnetic, laser and measuring technologies ; the DAT-based PC204 instrumentation recorder, HDD heads etc. Apparently let go by Sony in 2010 ?)
AMCO (Sony TC-8000 /835 /7 but also Luxman [yes !] K-5 and K-8 or Columbia TRC-382 and many more ; probably integrated into ASCO in the mid 1970s.)
Sound Tec
All MM and MC XL cartridges, HA-T1, and later on all the "MU" and StudioLabo series plus the famed & outlandish (but Invisibilia) SUP drivers / SEM series in the mid 90s.
The Sound Tec Corp. was located at 3-9-17 Nishigotanda, Shinagawa-Ku in Tokyo and the man behind the Figure 8 / XL-55 series was Yoshihisa Mori, who started designing tonearms and cartridges at Grace before joining Sony, heading the Sound Tec division until c. 1986. I believe Mr Mori also participated regularly to the editorial dept. of the Sony ES Review corporate magazine (of which I own all issues).
The engineering base and manufacturing of the XL-55 /44 /33 (sans "L") was handed over JP niche manufacturer Final Audio (aka Takai Laboratory Inc.) for ultra-priced versions (in the 200k¥ range, and above) just as the XL-MC7 was rebadged (as "Carnegie One") by Mark Levinson / Madrigal at about the same time.
Sound Tec seems to have finally vanished (or been absorbed /reshuffled /etc) after the SUP / SEM adventure, c. 1996.
Below, the "Sound Tec" sticker put on the (underside of an) HA-T1 :
JOLSON
or "Jolson HJ." ; production mainly in connection with the Sony Sound Tec division ; one run of Sony HA-50, MU-A081, SRP-P152 /E311 /E1031 /P2005 /P2070.
Sound System
1970 to 1980 ; turntables only like PS-2310 /5190 /3700 /4300 /4750 > 8750 /11 /X3 > X7 /P7X /X50 /X65 /X75, TTS-8000 /6000 etc - see the image below.
Audio System
shortlived 1979 to 1981 outfit added to, then incorporated into SOAU ; Syscon353CD, PS-X45 /X700 /X800 /FL5 etc.
DTKK or Daitoh
TA-4300F, first run of TA-1150D, TC-707MC, SQD-2020, Falcon SA-20F /10F /5F speakers, main run of HA-55 ; PS-X9, TA-N86 Mk2, first runs of PS-B80, TA-D900 & TA-N901.
Early DTKK stamp on a 1970 TA-4300F (but strangely not present on the accompanying TAD-43F ; after about 200 made, the stamp was replaced by a normal DTKK sticker) :
(and after about 1500 TA-4300F were made, the DTKK sticker was replaced by an... IZDK sticker
KWDK
Main plant for pretty much everything with audio tape.
Open-reel TC-755 series, TC-765 /766-2 /510-2 /366 /5100 /6200 /7660, k7 like TC-4300SD /2350SD /K8B /K55 /K71 /K75 /K3 > K8B /K80 /K96R, first run of TC-K88... and all ELcaset : EL-7 /7B /4 plus, of course, the Lo-D / D-9000 Hitachi variant of the Sony EL-7
Daiichi TK
Sony SRP-P2025 /P300, TA-N7050, PA-A200, first run of Sony CDP-5000 [1982] last run of TA-D900... but also Hitachi EQs and timers ; probably closer to Aiwa than Sony.
THTK or TOHOKU HT [TC-2220 /3000SD /5350SD /K7 /K7II /K7BII /K40 /K55, TAS-5]
(the three first kanji signs mean "Sony" ; the following ones mean "corporation")
KWDS (TC-2800 /2890SD /2350SD /2000 /5350SD)
DDKK (TC-K4 /K5 /K61 /K55 /K555ESII /R303 /U4 /3000SD /FX4 /FX200 /FX66 /V910WR, open-reel...)
IMDK (small open-reel, TC-4805, SQA-200, SQD-2050, PS-202, STR-201 /202, MJ-300, TA-1055A)
TTKK (TA-1166, STR-100A /101 /151, PS-101 /151, HP-50, HMP-70, YJ-200 etc ; also built for NEC [NS-637])
SSCO (early turntables up to the PS-5100 timeframe ; possibly the Sansui APS-900 luxury all-in-one as well...)
Sony-Radio (TA-1700)
Sony KZ (CFD-66, CFS-88 /10 /V5)
SON (VT-X5R)
Kibo KK (all Sony electrostatic speakers [SS-R10, SA-S1, SA-MD9 & PixyPro / Compo S], SMS-1P [broadcast powered mini-monitors])
Sony Ichinomiya [MUSE decoders like MSC-3000 /4000]
Iwate TT (world receivers like ICF-6800 /6800A, Falcon TAE-20F)
Iwate TKR (1990s later incarnation of the above ; broadcast & studio gear, like CDP-D11)
KKKG Very rare tag, silkscreened in typical Sony style : Eurostile bold, above- and under-lined.
Present on the Pioneer RT-701 /707, CT-9, T-3050 and some runs of the Sony TC-6150SD /4250SD /2150SD ; either a Sony/Pioneer joint-venture or a Sony subsidiary who built some of Pioneer's most remembered (mainly export) tape products... For those wondering, Pioneer always was a speaker specialist, Sony was a tape specialist.
(Not a visual coincidence : this IS a Sony source.)
(the five kanji signs in bold font mean "Pioneer" ; the following ones mean "corporation")
The following two apparently were of the earliest factories (identified as such) which may, or not, have been reshuffled to become any of the others mentioned above and below...)
KTLN (TA-1000 /1010, TC-6360 [aka TC-366])
SSKK [TTS-3000 /A, PS-3000 /A, PS-1200]
And also, among others :
IDSK (TC-100 /100F)
MSDK (CRF-320 /320A, one run of ICF-6800)
KTSK (TC-U4, TC-K5)
TWSO [TC-K5]
KGDS [PS-100]
TKKG [PS-100A]
TMDK [PT-24], but also Yamaha DT-2B
HCKK [PS-200A]
SSCO [PS-5100]
SKKC [TC-1160]
STKK [TA-1090] ; [TA-1150] (1090 : one run ; otherwise at Nagano TT) ; (1150 : late runs, otherwise at ASCO)
SKDK [or "Sakura" ; CFS-10 /F5 /V1 /V2 /V3 /V8, CF-2400 /6600] (but also the Pioneer SK-900 "Runaway" boombox

KWSO [TC-15F /K4 /K65 /FX6C]
KFSK [TC-1265 /1270 /2600, CF-1900]
SKEI [TC-1360]
AAKK [TA-1500, aka Aiwa AA-15X ; Aiwa factory]
Below, one example separating a japanese back sticker for the PS-8750 turntable, and an export equivalent.
Only the original shows the T-Tag, here Sony's "Sound System" which was between 1970 and 1980 the outfit dedicated to turntables.
As with the PS-X9 (and other pricey components), the PS-8750's early units had a simple "Sony" tag, replaced after about 500 were made by the dedicated outfit, which is probably when the export versions got into production as well.
And one T-tag which made it outside Japan : between late 1977 and 1979, many (but not all) exported high-end items had a small ASCO sticker added.
Here my own TA-N7B ; on the other #500082 number (first prod. run with silver faceplate) the sticker was added as well.... but penciled out by Sony DE !
And one more to show the look of the 1970s Sony T-tags (under- and above-lined), here for the TC-R6, aka TC-765 outside Japan.
This is KWDK, Sony's major tape/recorder factory before the early 1980s reorganization.
There are several sub-contractors that used this exact look and font and proportions for their T-tags : "AMCO", "YTKK", "KNSK" (apparently a k7 specialist) and "KKKG" are four of them, the latter two producing for Teac, Luxman and Pioneer (and Sony of course). I can't link them directly to Sony but they were all very very probably Sony-operated ; if not owned, they must have been direct affiliates, short-lived or not and later absorbed (or not, etc).
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Below, the Akai
Victor / JVC
[_UNDER CONSTRUCTION_]