Dating rola speakers
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Electronic components such as transformers, potentiometers, speakers, and some capacitors are often stamped with a date code, which indicates the manufacturer and the manufacturing date.
They were certainly employed in the AC100 cabinets given to Lennon and Harrison in August of that year.
Note that the profile of the cover is more cylindrical than bell shaped. In the upper compartment of the cab - two speakers with solder tags on the spokes of the frame, one (perhaps a replacement, as the others are earlier) with the code "30HL" = August 1966. Solder terminals on a board between the chassis spokes An instance apparently with a date code indicating 10 December 1964 (10MJ) is reported by Jim Elyea.
This must be a mis-stamping for 10JM = 10th September 1967.
For a selection of surviving cabs - click here In some respects though, the Celestion T1096, a 15 ohm version of the T1088 also made exclusively for Vox, might have been better choice for the new 4 x 12 cabinets, as a 15ohm load would have taken some of the strain off the output transformers of the Beatles' AC80/100 amplifiers.
One possible reason for the use of T1088s rather than T1096s, however, was the drive to keep the cabinets as trebly as possible (Midax horns et al. 16ohm speakers are said to be "darker" or bassier than their 8 ohm counterparts.
We can supply or vintage spec recone to the highest standards all British speakers from 5 to 18inch, pictured below is a small selection of the speakers we keep in stock, Celestion 12 inch speakers are without doubt the most popular vintage speaker with both collectors and guitarist's Please Email [email protected] price and availability or see listings below.
The Celestion register of speaker types - the "T" book - is printed in extenso (insofar as it relates to 12" speakers) by Michael Doyle, "The History of Marshall" (1973), appendix 1, pp. Some of the relevant pages are available on Google Books Also see Jim Elyea's wonderful, "Vox Amplifiers: The JMI Years" (California, 2009), esp. 264-276; and the numerous posts in the Vox and Speaker fora of the Plexi Palace. See the excellent comments on this Plexi Palace thread.The T1096 is regularly found, however, in Vox T60 speaker cabinets.Above, sold on ebay in late 2013, a T1096 from 23rd May 1964 (code 23EJ).Date code "16BH" stamped on frame = most likely February 1950.A later BO25 (with large screws on the cap) has been posted on the Plexi Palace - code 01DD = 1st April 1959. On the left, the classic blue, used extensively in AC30s.On the inside wall of your amp cabinet, there may be a tube location sticker which shows the tube layout, model number, production location etc..