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Post subject: Hot Rod Deluxe - Tubes or something else ?
Posted: Wed Sep 02, 2009 10:07 am
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On the clean setting (at about 2) on my Hot Rod Deluxe, I'm getting a distorted sound. Would this be the tubes or is it something else ?. The tubes don't seem to be microphonic.

If I do need to replace the tubes, would I need to replace them all ?

Thanks


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Posted: Wed Sep 02, 2009 9:35 pm
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Location: uɐʇsıʞɔnuɐɔ 'puɐlʇɐlɟ
Preamp tubes, the three 12ax7's can be individually swapped as/when needed.

The 6L6 power tubes need to be swapped in matched pairs, and the amp bias should probably be checked and adjusted if power tubes are changed.
Means opening up the amp and using a multimeter, or having a tech do it if you are not comfortable with electronics that have high voltages floating around in them.

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Posted: Thu Sep 03, 2009 10:29 pm
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One generally replaces tubes in two stages. As peterp mentioned, it's essential to change out the power tubes in matched pairs -- accompanied by re-biasing. The preamp tubes can be changed out individually which is helpful considering the diagnostic benefits of single valve changes. If you suspect a bad tube for instance, change one preamp tube for a spare that is known to be good. If nothing changes, move on to the next one. If it is a valve issue, you'll know right away which tubes are bad and which are good.


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