skidrow

Hi there,

I am a newbie to vintage marshall amp; recently I picked up a vintage marshall amp - JMP Super Bass 100W from a local private dealer; I have no idea of which year it was made in (The guy who sold it to me does not have a clue as well, i guess he is not that professional afterall). Anyone else here know where I can find reference to check the date out ?

Currently, I put EH-12AT7 & EH-EL34 inside it. I have no experience of changing tubes for amp, I have no idea of which kind of tubes has good tone to go with this amp. Does anyone has suggestions of what tubes I should try with this amp ? I heard someone said different tubes has different characteristic, so what if I really into vintage amp sounds, something like what John Frusciante's sounds, any tubes can come close to his sound?

Anyways, thanks for all suggestions and help in advance !!!

Thanks a million !!!

skidrow

Anyone can kindly help me out here?

Need suggestions of power & preamp tubes for this JMP SUPER Bass 100W (I have started with EL34 & 12AX7, and want to try some other tubes.)

THANK YOU !!!

HAMPAMP TUBE AMP SERVICES

If your serial number starts with letter A,B,C etc. it's easy to date. A started in July '69 B = '70, C = '71 etc. If it is older than July '69 it is a little more difficult to find the date but you may be able to get an idea by reading date codes on the pots, transformers and caps, but then it is only an estimate since those parts could be surplus from years before the date of manufacture.

__________________
Pie are not squared, Pie are round

Due to inflation, I can no longer afford to put in my 2 cents worth.


'81 Gibson SG jr
'97 Gibson SG Special
'82 Gibson Explorer
'63 Fender Strat
'00 Fender Strat
'76 Ibanez Doubleneck (Gibson copy)
'08 PRS Paul Allender
Kramer (parts box) V
Peavey Vandenburg (parts box)
Marshall 1959
Marshall VS100R
Marshall 1960/A x 2
Line 6 Flextone III
Peavey Triumph 60
Gibson GA-5
Danelectro Cadet Model 122

skidrow

Thanks man, I think mine is from 1974, the serial number (NOT starts) ends with "F", then I guess F should = 1974, thanks man !!!!

BTW, you have any suggestion of tubes ? I am really want to start to experiment with tubes.

HAMPAMP TUBE AMP SERVICES

"F" Would be a 1974 and it is on the end of the serial number. Also, a point I had forgotten is that the letter "B" was skipped because it ran for 18 months. The letters "I', "O" and "Q' were also skipped because of their similarity to numbers.
There are some people on here that are more knowledgeable about tubes than I am, so I'll leave that subject for others to answer. MartyStrat54 should be able to help you out with that.

__________________
Pie are not squared, Pie are round

Due to inflation, I can no longer afford to put in my 2 cents worth.


'81 Gibson SG jr
'97 Gibson SG Special
'82 Gibson Explorer
'63 Fender Strat
'00 Fender Strat
'76 Ibanez Doubleneck (Gibson copy)
'08 PRS Paul Allender
Kramer (parts box) V
Peavey Vandenburg (parts box)
Marshall 1959
Marshall VS100R
Marshall 1960/A x 2
Line 6 Flextone III
Peavey Triumph 60
Gibson GA-5
Danelectro Cadet Model 122

skidrow

Thank you Hampamp, this is really helpful, now at least I know the manufacturing date of my Super Bass.

Alright, let me as help from MartyStrat54 then.

Thanks ~!!!