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FDP Forum / Fender Amps: Vintage (before 1985) / SF Twin 135 watter



Apr 9th, 2012 05:31 PM   Edit   Profile   Print Topic   Search Topic

Is there any way to get this amp to break up a little without turning wide open??.
If not, and the fact it weighs 4,234 lbs., it may have to find a new home.It is equipped with EVM-12Ls.

Contributing Member

Land of the Pirates

Apr 9th, 2012 09:02 PM   Edit   Profile   Print Topic   Search Topic


Contributing Member

Philly, B-3 Capitol

don't dream it.....be it
Apr 9th, 2012 09:32 PM   Edit   Profile   Print Topic   Search Topic

yank the EV's and put in something w/ a smaller magnet and it will be 1,480 lbs lighter as well.

Contributing Member

So. Cal. USA

Apr 9th, 2012 11:56 PM   Edit   Profile   Print Topic   Search Topic

It is what it is, loud clean and heavy.

Contributing Member


Apr 10th, 2012 12:09 AM   Edit   Profile   Print Topic   Search Topic

"... it may have to find a new home..."


(This message was last edited by barry.b at 12:10 AM, Apr 10th, 2012)



Apr 10th, 2012 05:48 AM   Edit   Profile   Print Topic   Search Topic

What would be a good replacement. Blues deluxe or??

Steve Dallman
Contributing Member

Merrill, Wisconsin

Ain't turned 60, but I got my blinker on
Apr 11th, 2012 07:39 AM   Edit   Profile   Print Topic   Search Topic

You could change the master to a post PI master that really works.

One of the most common mods to this amp to open it up some is to disconnect the negative feedback. I've worked on quite a few of these. I took two of the power tubes off the UL taps and wired them in triode as well as changed the master. That one turned out great.

Without internal mods, take out the first preamp tube (if you aren't using the normal channel.) Put that 12AX7 in place of the 12AT7 Phase Inverter, the small tube next to the power tubes. Remove either the inside or outside pair of power tubes.

That will kick up the gain of the vibrato channel a bit, allow the PI to breakup when pushed, and reduce the power to half. Now, half of 135 watts is still a lot, but it all adds up.



Apr 11th, 2012 08:32 AM   Edit   Profile   Print Topic   Search Topic

how about pulling 2 of the output tubes, assuming there are 4 to begin with. Works good with my Traynor Custom Special, also a 135W amp! It does seem to change tone and characteristics slightly though.

FDP Forum / Fender Amps: Vintage (before 1985) / SF Twin 135 watter

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