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Old 01-18-2013, 07:21 PM   #1
yousef213
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Marshall Class 5 OT

I bought a marshall class 5 and it has a subtle hum even when the volume is at 0, and it gets louder as i increase input volume. I have been suggested to rotate the OT 90 degress, do I need to frain caps and remove tubes before doing this, thanks.
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Old 01-18-2013, 07:41 PM   #2
AcousticMirror
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all single ended amps hum like that.
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Old 01-18-2013, 07:47 PM   #3
yousef213
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I have heard this ^ but many people say that it goes down dramartically when reorienting the OT, are there any safety issues in terms of taking out tubes, discharging caps, etc?
http://www.mylespaul.com/forums/squ...ass-5-a-11.html
post 321 says that this reduces hum. I wanted to know the safety hazard because there is no harm in trying
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Old 01-18-2013, 07:52 PM   #4
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Yes, you need to discharge caps and take out tubes. If you didn't even know that, maybe the mod is above your level.
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Old 01-18-2013, 07:57 PM   #5
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^Thanks The reason I asked because there are no caps on the chassis of the amp itself, so I wasnt sure ( also I am talking about rotating not replacing

Last edited by yousef213 : 01-18-2013 at 07:58 PM.
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Old 01-18-2013, 08:09 PM   #6
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Well, you'd still need to place your hand inside of the chassis to insert a second nut, as well as drill a hole into the chassis. Anytime anything goes inside of the chassis, caps should be discharged. Tubes should be removed just as a general rule; it's too easy to break them when working on an amp with them in place, particularly if they're taller than the transformers and you'll be drilling the chassis.
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Old 01-18-2013, 08:18 PM   #7
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you can't just turn the ot. it's not on a swivel. you need to unscrew it and drill new mounting holes for it.
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Old 01-18-2013, 08:24 PM   #8
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Thanks guys
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Old 01-18-2013, 08:56 PM   #9
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Shocking hazard my friend...
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