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-   -   Marshall Class 5 OT (http://www.ultimate-guitar.com/forum/showthread.php?t=1583547)

yousef213 01-18-2013 07:21 PM

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.

AcousticMirror 01-18-2013 07:41 PM

all single ended amps hum like that.

yousef213 01-18-2013 07:47 PM

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

mmolteratx 01-18-2013 07:52 PM

Yes, you need to discharge caps and take out tubes. If you didn't even know that, maybe the mod is above your level.

yousef213 01-18-2013 07:57 PM

^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

mmolteratx 01-18-2013 08:09 PM

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.

AcousticMirror 01-18-2013 08:18 PM

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.

yousef213 01-18-2013 08:24 PM

Thanks guys

Perverockstar69 01-18-2013 08:56 PM

Shocking hazard my friend...


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