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Dt50 White Noise

dt50 noise hum

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#1 swing_girl

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Posted 16 August 2013 - 07:09 PM

I recently bought a DT50 112, love the sound and feel but the noise / hum when even nothing is plugged in is very annoying. It is about as loud as a window air conditioner working hard. Since I live in a place where the shops do not do exchange or refund, I have to live with it or sell it, which I don't want to as I like the sound. Is there any way to deal with this noise? I am plugging it in the wall with no other electric appliances nearby.
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#2 TheRealZap

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Posted 17 August 2013 - 08:43 AM

you might try swapping out the tubes... i've heard that can make a big difference in how quiet the amp is.


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#3 Crusty_Old_Rocker

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Posted 17 August 2013 - 09:05 PM

Try taking it somewhere else and plug it in. Try a few different locations because this will let you know if it's the amp or the environment it's that's creating the problem. You may just need a power filter.

Cheers,

Crusty
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#4 spaceatl

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Posted 18 August 2013 - 08:37 AM

I changed the 12AX7s in my DT50 to using a GT-SAGAX7 for the inverter and a Mesa SPAX7 for the buffer...Dramatic difference. I have not had very good luck with those EH 12AX7s that come stock...They always seem to be quite noisy...At least the ones I have gotten have been.


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#5 themager

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Posted 06 March 2015 - 07:31 AM

I know this is an old thread, but I recently bought a DT50 112 online as the price was fantastic. It did have quite a bit of white noise, especially on the British Chime configuration, class A, no negative feedback loop. I found that channel unplayable. Read this thread and got around to finally changing the 12AX7s (Russian Electroharmonix) to basic Slovakian JJs ECC83s (Tesla remake). Made a nice difference - won't say it was a huge difference, but brought the noise to a reasonable level. I've attached a picture showing the before and after noise level taken with my iphone - the impact is clear.

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