#1
Question about tubes.

I put new tubes in my blues deluxe reissue a year ago. It stays at my rehearsal space and I have a practice amp at home, so I only play it once a week.

The pre amp tubes are Tung Sol 12AX7s

The power tubes are Winged "C" 6L6GC

Last time I played it I started hearing a muffled sound to the tone. It doesn't muffle the volume just the usual lush tone it has. Could this be the tubes going already?
#2
More likely to just be dirty. And more likely to be the input socket than the tubes. Buy a can of contact cleaner. Spray some liberally onto a plug and work it in and out of the jack a few times. ie. you are using the plug as an applicator.
You can do the same thing to the tube sockets too if you like only using a tube as the applicator. ie spray it on the tube pin.
You need proper contact cleaner (Deoxit is a good one) NOT WD40.
I assume you've already tried a different cable, no?
Gilchrist custom
Yamaha SBG500
Telecasters
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100


Cathbard Amplification
My band