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Need help identifying the year of a SF DR...

12/14/2005 2:45 AM
SteveB Need help identifying the year of a SF DR...
I am considering trading my 1978 Marshall 100W half stack for a SF Deluxe Reverb. There is a faded stamp on the inside of the chassis that reads "Chassis Wiring M. Torres J1571" I think it is the letter "J" in the number sequence. The guy said it was an early '70's or '70, so I'm just double checking. He replaced the speaker with a Celestion G12H, & it sounds really nice.  
Any help would be greatly appreciated!  
12/14/2005 10:12 PM
Tom Phillips

I usually date these by transformer and Pot codes. Can you supply the numbers stamped on the transformers, the choke and a few of the pots? That will allow dating and give an idea if all are original. Always nice to see a picture of the inside of the chassis too. Also check to see if the baffle board is mounted on cletes or if it is dadoed into the sides of the cabinet. IIRC the dadoed baffle boards started showing up in late 1972 in the SF amps. All amps were not changed over at the same time. Note that the chassis and the cabinet could be from different years.  
I'd be glade to give you an evaluation of any phots you care to email to me.  
Good Luck,  
12/17/2005 12:03 AM

I agree, I usually start with the pots. if you see a number on the back of the pot like 1377224, the 137 means CTS made the pot, and the 7224 means the part was made in the 24th week of 1974.  
If you look at a few date codes on pots, cap, trannys etc, you can get an idea of the age. Usually the amp will not be older than the most recent part in there, unless the part has been replaced at some point. And for that matter, most parts do not sit around for a couple years before going into amps.
12/17/2005 2:12 PM

The codes on pots and transformers are probably the best indicators of the amp's age.  
The serial number on the back of the chassis is helpful too. DR serials were roughly A31000 - A33000 in 1970, A33000 - A34500 in 1971, A34500 - A37000 in 1972 and A37000 - A39000 in 1973.
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