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Post subject: Blues Deluxe Reissue Humming
Posted: Fri Aug 03, 2007 3:18 pm
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I have a relatvely new Blues Dluxe Reissue. I am getting some humming/hissing noises out of the clean channel. The gain channel is fine; there is only a small amount of operational noise present. However, when I switch to the clean channel the hissing noise increases. Does anyone know how much hissing should be present in relation to the percentage of the volume setting?

Thanks!


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Posted: Mon Aug 06, 2007 4:30 pm
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Faint hiss is normal for tube amps, but it shouldn't be audible at normal playing levels.

Tubes can be the cause of hiss. How old are they? Do they get a lot of playing? Try swapping V1 and V2 to see if the amp is any quieter. If so, replace V1 with a fresh 12AX7.

Hot Rod Deluxes and Blues Deluxes have had some problems in the past with plate resistors. They can crack and become noisy. They can be replaced with metal film resistors, which are inherently quieter.

Old tubes can cause hum, too. The HRDx and BD are not normally hum-prone amps.


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Posted: Thu Aug 16, 2007 1:08 pm
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Forgive me, but are the "plate resitors" you refer to an item that is cntained with in the tube?

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Posted: Thu Aug 16, 2007 2:05 pm
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The plate resistors are on the circuit board.

Start with fresh tubes--or just try swapping around the 12AX7s to see if one of them is quieter in V1 (the rightmost tube from the rear).

If tubes don't help, your next step is an amp tech to look it over.


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