I recently ordered a drri from an Internet firm. First one had a noisy effects channel and non working reverb when it arrived. I fixed the reverb as it was a loose connection on the tank, but after going through the valves from v2 on the effects channel was still noisy so it got picked up and a replacement delivered. Second one just stopped working after half way through a gig. Powered up the end tube next to the power tubes but all others and the power light were not getting any current. Now I am sending this one back. Am I unlucky or is there a serious quality problem here?