What's your experience using the Canada Marconi 6SN7 5692 6SN7GTB tubes in your rig?

I just pulled the trigger on (2) matched ’poor mans’ Marconi 6SN7’s, the Canada Marconi 6SN7 5692 6SN7GTB with Copper Rods and 3 Holes code date 1952. Right now I have matched 1940’s (1) Sylvania 6SN7W metal base and (1) Sylvania 6SN7GT metal base in my LTA Microzotl MZ3. I’m also in the works with Andy of Vintage Tube Services to purchase (2) Matched Sylvania 6SN7GT 1952 ’Bad Boys’.

@ptrck887 thank you, thank you, thank you, for taking the time and effort to patiently walk me through the educational process to get the right tube. After comparing the picture of the Canada (Marconi) GE 6SN7 5692 6SN7GTB Copper Rods 3 Holes tube with the Canada Marconi 6SN7 5692 6SN7GTB Copper Rods 3 Holes code date 1952, they were identical.

The Canada Marconi’s 6SN7 5692 6SN7GTB tubes are the tall bottle and taller than other 6SN7’s and that’s when I knew I had the right tube. It was just the luck of the draw that the Canada Marconi 6SN7 5692 6SN7GTB tube is dated 1952. And another good thing is the (2) Canada Marconi’s only cost me $170 US including tax and shipping with a 30 day return policy. The Canada Marconi’s were bought out of country so it’s going to take a while for me to get them and burn/run them in, but I will keep everyone posted.

The Canada Marconi 6SN7 5692 6SN7GTB for tube(s) reference: The Reference 6SN7 Thread - Canada Marconi - page 641