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Post subject: Supersonic 112 combo overheating gets mushy after an hour...
Posted: Tue Jul 12, 2011 10:52 pm
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My Supersonic sounds fine for about an hour but then seems to loose power and or how do I say it… “balls”. It gets mushy as hell. I have done speaker swaps but that did not help. I ran it with an extension cab and same issue as well. I changed the power tubes just to see if that would help but same problem I have dome some pre-amp tube swapping and replacing but no help there either. Any Ideas? It aint my ears cause as soon as I plug in my other amp all is well.


Last edited by reyesx6 on Tue Jul 12, 2011 11:18 pm, edited 1 time in total.

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Post subject: Re: Supersonic 112 combo overheating? losing umph after an h
Posted: Tue Jul 12, 2011 11:07 pm
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Tough call but I'd start troubleshooting the power supply, specifically the tranny. If that checks good, it could be anything -- from a cold solder joint to a bad coupling cap.

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: Re: Supersonic 112 combo overheating gets mushy after an hou
Posted: Wed Jul 13, 2011 6:57 am
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Warranty? Also, what is the bias setting? :idea:

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Post subject: Re: Supersonic 112 combo overheating gets mushy after an hou
Posted: Wed Jul 13, 2011 7:36 am
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shimmilou wrote:
Warranty? Also, what is the bias setting? :idea:

out of warranty. don't know about the bias.


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Post subject: Re: Supersonic 112 combo overheating gets mushy after an hou
Posted: Wed Jul 13, 2011 7:49 am
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Just a thought, the bias setting being too cool or too hot can have a negative impact on your sound. Some Fender amps are known for being biased too cool or too hot from the factory, and IIRC the Super Sonic is one. :idea:

Maybe do a search on this forum for "Super Sonic" for some biasing tips. I believe that you have two test points (one for each output tube), and an adjustable bias pot on your amp, so you can check your bias setting with a simple meter that measures DC voltage. Simply check the mV reading at the test point (TP49 or TP50), and check the Plate voltage for either output tube, multiply the two numbers to find your idle wattage (roughly).

http://support.fender.com/schematics/guitar_amplifiers/Super-Sonic_Combo_schematic.pdf

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