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Post by stompboxfreak1972 on Jan 23, 2009 20:05:57 GMT -5
can I just move the outside tubes to the inside since I run in 50 watt mode only ? I am thinking that I am only using two tubes in 50 watt mode so when they start sounding dull I could just plug in the "unused" tubes in the other positions.
Is my thought process on this wrong ?
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Post by porkchops on Jan 24, 2009 15:44:15 GMT -5
You could do that but you will need to check the bias if you want the best tone.
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Post by SonicExplorer on Jan 24, 2009 16:01:41 GMT -5
The theory is fundamentally correct, except just realize the outside tubes do not remain "unused" if that's what your thinking. Tubes loose life weather in 50W or 100W mode, they just wear in a different fashion and at different rates. The outter tubes in 50W mode will wear slower than the inner tubes but they still wear. Also, if a tubes red-plates then it will take out the pair in many cases (either left or right pair). So if you regularly prefer 50W mode then you may want to just remove the outter two tubes altogether.
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Post by stompboxfreak1972 on Jan 25, 2009 20:13:47 GMT -5
Thanks SonicExplorer. I suspected that the " unused" tubes in 50 watt mode would still be being taxed. I appreciate the information.
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Post by jchan on Jan 25, 2009 21:22:48 GMT -5
In 50 watt mode, the filament is still on in the outside tubes. If you are only playing in 50 watt mode, its best to remove the outside two tubes. It will extend their life by doing so. Josh from Splawn also recommended this during a discussion I had with him about it. As mentioned above, if you ever replace the two tubes with the two that were pulled, you should check and re-adjust bias as needed.
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Post by firebird on Feb 7, 2009 9:53:08 GMT -5
If you are going to pull the outside tubes and run it in 50 mode at the same time you should also set your ohms to 1/2 of whatever your speakers are set at. Ex. 2 tubes out and in 50w mode / 4 x 12 cab is 16 ohm cab - Set the head ohms to 8 ohms.
If you dont it won't blow up your trannys or anything but it is a better match and does put less stress on the output tranny.
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Post by stompboxfreak1972 on Feb 7, 2009 11:31:51 GMT -5
I have never biased an amp and do not have a bias meter. Is this a fairly simple process to learn ? I figure I should order up a bias rite and just figure this stuff out but I have a fear Ace Frehleying myself.
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Post by firebird on Feb 7, 2009 13:27:31 GMT -5
fairly easy but could be deadly if you touch the wrong stuff.
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