This video is about how we can identify fake JBL earphones. To Watch this video in English Version click here - Buy this produ. There are 2 acceptable methods of displaying the EIA date code, with or without a hyphen between the manufacture code and the year/week code. Some manufacturers also attached other letters to the end of the date code to indicate day of the week, work shift, serial number, lot number, etc. The EIA only specifies manufacturer and year/week code.

Thank you – great response and much appreciated!

This Twin does not have a stamp on the tube chart that wouldmatch the pattern you listed. There are two stamps on the tube chart:Production “58” and “PG” stamped near the bottom right.Unfortunately I only have pics of the amp to go on for a few more days. Thepics I have are, however, very high resolution and cover almost all of thespeakers + cab in the back. The speakers and do NOT show an “F”imprinted on the foil label of the speakers. I have the serial numbers on thespeakers and, from what I’ve been able to gather, they look to be from aroundthe same time as the amp (1965). Unfortunately the pics do not really includethe cone (so I can’t see any stamp on the cone).

The frames are gray with yellow JBL on the driver. Serials are 117xxand 120xx (where “xx” is a number). They say “signature speaker”across the top (but not “Jim Lansing signature speaker” like the ‘61sapparently).

Jbl Serial Number Checker

And I’m with you on the “ears” bit – I won’thesitate swapping these out if they aren’t what I want. I’ll justcarefully pack them up and, if I ever sell it, they’ll go with it andmake it a premium cost J I have a pair of Tone Tubbies in my 73 Twin that are amazing –maybe they’ll be great in a ’65 too. I hope to find out!

I appreciate your time on this, Kevin – thank you for anyinsights!

Jbl Serial Number Registry

Scott