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Post subject: Question on Super-Sonic Output Tubes??
Posted: Fri Jun 25, 2010 12:40 pm
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Several years ago I used a 65' Bassman head and a 2-12 cab and it was great but, it was borrowed a technician removed one of the tubes to reduce the wattage so it wasn't too loud for our small stage setup... Now a while back I bought a Super-Sonic Head and a 2-12 cab. My question is relating to the tubes. Will it reduce the amount of output power on this newer amplifier if I remove one of the output tubes like it did on the old Bassman or is it way different on how it is circuited? Thanks for and help/advice. (also I only use the clean channel with my effects on a pedal board prior to the amp input in case you need that information)

Thanks,

MBT


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Posted: Fri Jun 25, 2010 4:23 pm
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No you can't remove one tube on your Super Sonic. The two tubes (6L6) work tgether, in push pull. If you remove one tube, the amp won't work.

Same thing for a 65 Bassman, head.

You must do a mistake with another amp


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Posted: Fri Jun 25, 2010 4:30 pm
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I am not mistaken, I am at my friends right now looking at. The aforementioned 65 Bassman. Its schematic does not have it in push/pull, it was hand wired in series therfore reducing wattage by half when one tube is removed and verified again tonight by output volume. On my SuperSonic when I remove 1 tube it still works, and is just as loud which leads me to believe that this system is cascading... Waiting for schematics on that amp, they may be in parallel also, but that wouldn't make much sense.


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Posted: Fri Jun 25, 2010 5:57 pm
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SuperSonic:
http://support.fender.com/schematics/gu ... _Combo.pdf

Bassman 5f6a:
http://schematicheaven.com/fenderamps/b ... _schem.pdf


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Posted: Fri Jun 25, 2010 6:17 pm
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The schem for the Bassmann is not the same as what we have, there is no direct connection between the output tubes, it is a rewire by an amp maker in Minnesota, that we have figured out tonight. The schem for the Super-Sonic is quite different than mine also, I have mine now that I am home, it's the 60th Anniversary edition head only... It actually appears to be hand wired but one can tell it isn't. I'm still at a loss because it works with only one tube in place, which is weird, according to my schem it shouldn't at that point... and its not just me either... I have a Fender auth tech here and he too says it shouldn't work with one tube yet it does... Perhaps time to send it to Fender for a repair???


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Posted: Fri Jun 25, 2010 9:13 pm
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Hi there Mc Vay, if I understand what you're saying(which is questionable), the amp is just running in a single ended mode. If the tube is biased hot enough, it won't go into the push-pull cutoff condition. But I guess the amp is being played at low volume. When it's pushed hard enough, the tube will go into cutoff, unless the bias is adjusted for a 360 degree current conduction for that tube. The cascade set-up refers to the pre amp. In the power amp section, that would be kind of complicated, but not impossible. Art

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Posted: Fri Jun 25, 2010 10:26 pm
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I (we) tried it at several volumes, from 1 up to around 6.5-7 and it was working, after 7 the volume never increased just leveled off. I have a tech here who is Fender authorized and he has solved all issues and has everything figured out and set me up to limit the wattage with the help of a Fender rep on the phone. It is possible and they will help however it involves a slight rewire and will void your warranty. We just needed to modify the effects loop to use an attenuator and then I can get the good clean tone from two tubes. The fx loop let too much volume through because of hoe it was wired, Fender told my auth dealer/tech he had to adjust/wire that particular he got it off the schematic and we are 100% now. Thanks for the help/ideas though. Again, I don't know all the terminology and don't care to I play and can pay others to know that.

MBT


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Posted: Sat Jun 26, 2010 3:11 am
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I have always someting to learn from this forum.

Good to know.

Thanks everybody


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