I have some valve stuff , I love valve sound too , and one of the tweaks is polishing the pins so that they are ultra clean and make the best contact in the valve holder (tho I think its most likely of little effect as just pushing the valve into the valve holder probably scrapes the pins clean)
Geez - you lot have dirty minds wink

Roon/Tidal, SBT, Trinnov ST2 , Twin Devialet D premiers, Vivid Audio Giya G1 Spirits, dedicated and treated room.
Meridian gear: 568.2mm and DSP5000's acting as TV speakers.