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Martint
5
Mar 24, 2014
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I have read here and on the headphone sites of the hum problem and of various solutions with this amp. My unit has/had a hum straight out of the box. After about 20 hours the unit is silent as long as I use the 6SN7 that came from the factory. The other 6SN7s that I have (Electro Harmonix, Electro Harmonix gold pin, and Tung Sol) all still produce a hum, mostly in the left channel. Since these tubes are not NOS then I am assuming that it is not a tube problem. Am not equipped to start moding the unit (have read about the fritz mod), so should I expect this problem to go away in time and/or should I be running the noisy tubes in the unit to aid this process ? Thanks for any advice available.
Mar 24, 2014
LQDForce
533
Mar 24, 2014
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Either you got bad tubes, or there's still gas in 'em.
Bear in mind, most tubes you buy online for cheap are of poor quality and/or were stored in poor conditions.
Other than that, there's a remote chance you're having a ground loop. May I ask whether you're using the amp in the U.S or abroad?
Mar 24, 2014
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