I have an amp which I'd be grateful for some community input on (as someone who is entirely incapable when it comes to electronics, circuitry, etc), and which may be of interest to you guys.
I have a wonderful old Fender Princeton from late 1963 - it's a transitional "tuxedo" model, so the blackface livery with the brownface 6G2 circuit. It's a beautiful thing. I was told by the previous owner that it is actually the amp pictured on page 50 of the "First 50 Years of Fender Amps" book.
The amp sounds absolutely spectacular - guitars sound very "full" and very dynamic through it, and all sorts of overtones and harmonics jump out at higher volumes. It's truly wonderful to play. Anecdotally, everyone who's ever played it has offered to buy it on the spot!
I bought this 5/6 years ago, and have a printed chain of emails indicating that the amp was modified or "optimised" by Howard Dumble some years ago. I haven't given this too much thought over the years but decided to investigate this properly.
You can see my pictures below.
From some research, it seems that Dumble used to stamp his modded/rebuilt Fender amps "A.D.". This stamp is present in the main body of the 'cage'. I've also found some pics of an old Dumble Bandmaster, in which you can see the exact same stamp, with the faded first leg of the "A" and the weird backwards tick through the "D", here: http://www.amparchives.com/folder/2519/
There's also a number inscribed on the speaker in the same place and handwriting as I've seen on some other apparent Dumble/Fender mods.
I'd be hugely grateful for your thoughts. I put this on another forum and Rob Livesey from the UK, who seems knowledgeable on these matters, indicated that it has "all the hallmarks" of a Dumble-modded amp.
