I thought I would share these photos of the first instrument amplifier to offer JBL's as the stock speaker. Mostly 15" but there were also 12" and 8" amps offered. I know of a steel guitarist that added them, 2 - D131's, to his 1953 Fender Twin~Amp but Fender wouldn't offer them until the Vibrasonic~Amp was introduced in late 1959. The earliest sporting D-130's before the development of the D-130F
Bob Crooks took orders for his custom Standel amps and made less than 70 of them in his garage before moving to a larger facility. Most were ordered by professional musicians and many were ordered by players that also owned Paul Bigsby built electric guitars. I'm not a tech but I've been told this amp was designed using the Williamson Hi-Fi circuit. The amps were unique in they only had 1 input. There was a special hidden input, complete with separate vol control, under the chassis designed by guitarist Joe Maphis as a way of deterring unwanted players from "sitting in".
The amp used 807 power tubes. The Power chassis was mounted on shock absorbing mounts and it was probably the first amp to offer a lighted panel. There is a Standel History page found easily with a google search.
This particular model is a 25L15 , it was built in 1954 for Portland OR steel guitarist Lee Buck and features the period D-130. I have no reason to doubt this is not the original speaker to this amp as I got it from the second owner and the remainder of the amp was stock. It was ordered to accompany Lee's Bigsby steel guitar as many were. The last owner played fiddle thru it. The amp became a favorite of Chet Atkins who owned one.
I've been asked how it sounded. I found the best way to describe it is like this; Creamy, if the head on a Guinness Stout had a sound, it would be this amp. Easily the rarest piece of gear I've ever owned. The small piece mounted to the speaker baffle is a mic mount. The amp was fitted with a small plaque on the front that had the original owners name. It is missing on this amp.