2006 amps have a small metal “Fender 60th Anniversary” button on the back plate. Early Tweeds The early green board tweed-covered amps were not lacquered. It has the same cream board inside with the same components as every other current-production Blues Junior.
The serial numbers for these amps begin with “LO,” indicating that they were made in the Fender/Sunn Lake Oswego factory. It usually applies to old vacuum tubes/valves that have gone unsold for decades. All cream board tweed Blues Juniors have a “Limited Edition” plaque on the back.
Again, it's important to be sure the parts are original on the music equipment to get a valid date for the amp.
By cleaning the remainder of the broken keyway from the tube base and properly installing this keyway replacement (a little dab of silicone sealant works great to hold it in place), your tube can safely be reinstalled into your equipment. Note: when using an adhesive to secure the keyway to the tube base, DO NOT use a water-based glue. Values available include 10u F/500V, 16u F/475V, 22u F/500V, 47u F/500V, 80u F/450V, 100u F/100V, 100u F/450V, and 220u F/300V. Ruby Gold Capacitors are rated at 105 C for longer life, improved stability in the hot environment of tube amplifiers, and increased protection against electrolyte deterioration.
See our Buyer’s guide to vintage Fender amps for a guide and picture gallery of the known original speakers in the blackface and silverface amps.
Other sources to date your amp may include serial numbers and overall look and visual components on the amp as well.
For example, the logo on the amp or materials used during a certain time period of production.