5F1 tube rattle?

My newly built 5F1 rectifier tube is a 5Y3GT and it has a rattle or rather high pitch tingy noise (no doubt from speaker vibration) when playing certain chords at low-medium volume. I've changed it out with another new tube and still a rattle/noise. Is this typical? Any suggested mods to improve or fix? Otherwise the amp is awesome.
Thanks!!

If you tried a different 5y3 and the problem persists, you may have another problem. It could be a bad solder joint. First check the joints on your preamp tube for any signs of weak joints or flotsam that may be shorting the pins. Then check for any bad grounds.

Use a wooden chopstick to find the source of the noise.

http://www.el34world.com/Forum/index.php?topic=849.0

Ive Isolated the noise and it's the tube making the noise (5y3 -rectifier only...power and pre are fine).. Both tubes I have each seem to rattle at mid level volume. When I tap the 5y3 (when pulled out of the socket) it has a chime-rattle. Is this typical or do I have 2 odd tubes? Is a spring or rubber grommet at the socket mount an option to surpress the vibration...and noise?

I am curious what you discover here as I have experienced similar rattle-vibration at times in my 5f1clone. I too did the chopstick test and found no problems I did find some various loose fasteners in the chassis .around the transformers, and board. I also made sure tube sockets were tight and the fasteners that hold the baffle board to the cab. I did find some loose ones and this eliminated 90% of the issue every now and then it still does it a little but I figured it was speaker.

What kind of 5y3 tubes are they? I usually use NOS 5Y3's rather than any new makes.

It's the Sovtek 5y3gt. Both have a little rattle, which is producing the noise. What would you recommend?