Aloha from the ISLANDS!!!!

marbleisland · 03-07-2008, 08:49 PM

New to Marshall, New to Forum.... NOT new to tubes!!
So I just picked up a used TSL 60 and after taking off the screen around back and wiping everything down, removing the tubes and cleaning the contact points and re-seating all the tubes, I noticed the output transformer is NOT the original one. The amp sounds fine (great really) but the power doesn't seem to be at a full 60 watts. I checked the bias and that is a steady 75 mA. (this is a 60, not a 100... 100's run at 80-90 per side.)
Next order of business was to compare (unfairly) the TSL next to my Mesa Boogie Express 5:25. The TS is going through a 1960 Lead (cut in half, so its a 2 X 12... DON't ASK!) and the Mesa is going through its own 1 X 10 open back plus a 1 X 10 extension, also open back. The Mesa is louder than the TSL!!! Is my T.S.L. S.O.L.??? Or am I missing something???
How would I go about diagnosing the Output as well as the Power Transformer.

By the way, replaced the pre- and power tubes with JJ's and rebiased already!

Thanks for ANY advise or comments!!!

Aloha!

03-07-2008, 08:49 PM	#1 (permalink)
marbleisland Junior Member Join Date: Mar 2008 Posts: 5	Aloha from the ISLANDS!!!! New to Marshall, New to Forum.... NOT new to tubes!! So I just picked up a used TSL 60 and after taking off the screen around back and wiping everything down, removing the tubes and cleaning the contact points and re-seating all the tubes, I noticed the output transformer is NOT the original one. The amp sounds fine (great really) but the power doesn't seem to be at a full 60 watts. I checked the bias and that is a steady 75 mA. (this is a 60, not a 100... 100's run at 80-90 per side.) Next order of business was to compare (unfairly) the TSL next to my Mesa Boogie Express 5:25. The TS is going through a 1960 Lead (cut in half, so its a 2 X 12... DON't ASK!) and the Mesa is going through its own 1 X 10 open back plus a 1 X 10 extension, also open back. The Mesa is louder than the TSL!!! Is my T.S.L. S.O.L.??? Or am I missing something??? How would I go about diagnosing the Output as well as the Power Transformer. By the way, replaced the pre- and power tubes with JJ's and rebiased already! Thanks for ANY advise or comments!!! Aloha! Last edited by marbleisland; 03-08-2008 at 02:37 AM.

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