DELCO

DELCO



Here's some Delco tube boxes. I think everyone is aware that Delco is one of the parts brand names for General Motors. The first two boxes are early radio boxes, the other two are from when they also marketed TV tubes in the 1960's. For the early radio tubes they bought their tubes from the lowest bidder. The eligible bidders would have been the first line manufacturers like GE, RCA and Sylvania. Maybe Tung-Sol or Raytheon. When they got into TV tubes, I'm not as sure, but I think they were still pretty good. Most of the manufacturers are identifiable by their RETMA code or the famous RCA octagon enclosed type number.

Early in my career, I worked for a guy that used a great deal of Delco Radio and Television tubes. The place was Stark TV in Wickford, RI in the early 60's. To the best of my recollection, we had very few problems with the DELCO tubes.



Date codes for GM-DELCO tubes made by RCA, RETMA/EIA mfg code 274.
(Table from Ludwell Sibley's TUBE LORE).

Prior to the years in the table they used the ywk method. One digit for the last digit of the year and two digits for the week.
The ywk code also applies to Sylvania made tubes (RETMA/EIA code 312). The table does not.
Also note: As with their own tubes, sometimes RCA left the EIA code off.
JanFebMarAprMayJunJulAugSepOctNovDec
1957RRRARLRMRORTRSRURDRFAEAN
1958ARAAALAMAOATASAUADAFLELN
1959LRLALLLMLOLTLSLULDLFMEMN
1960MRMAMLMMMOMTMSMUMDMFTETN
1961TRTATLTMTOTTTSTUTDTFSESN
1962SRSASLSMSOSTSSSUSDSFUEUN
1963URUAULUMUOUTUSUUUDUFDEDN
1964DRDADLDMDODTDSDUDDDFEEEN
1965EREAELEMEOETESEUEDEFNENN
1966NRNANLNMNONTNSNUNDNFRERN
1967RRRARLRMRORTRSRURDRFAEAN
1968ARAAALAMAOATASAUADAFLELN




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