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previous: Ian I have an early 70's MkII 50 watt h... -- 10/17/2000 6:49 PM View Thread

Re: Dating 70's Marshall amps

10/17/2000 8:51 PM
M Cook
Re: Dating 70's Marshall amps
Hi Ian,  
According to the chart in Pitman's book, the letter F indicates it is from 1974.  
The prefix of your serial number should probably be S/A.  
I don't know what year Marshall stopped using PTP, maybe Trace, Rebel, or one of the other Marshall guys might be able to help. :)  
P.S. Here's one for you. I've got a 100W Super Lead that I can't easily date. Someone changed the face plates from the gold metal panels to a dull silver/aluminum metal panel, silkscreened in gold all of the markings for the controls & jacks. However they silkscreened the serial # on the back panel without the letter.  
I've talked to a few people about it and the best we can come up with is ~1973. This amp has a small lettering, white logo on the box, 2" laydown PT (500V on the plates), 6 50/50 LCR caps (not caps inside the chassis), metal toggle switches for power & standby not plastic rockers, and holes for 4 speaker jacks.  
PLEASE don't think that I did this to this amp. When I bought it it had an unwired pot beside the toggle switches and above it the panel is labled Pre-Vol. It also had an active effects loop installed with level controls in two of the speaker jack holes. I've since brought it back to the stock 1959 circuit. :)  
Any takers on dating this amp?

Tim Swartz I've not seen LCR caps on an amp th... -- 10/17/2000 9:40 PM
Ian Thank you Michael for the i... -- 10/20/2000 7:42 PM