charles1dad,
I'm using Svetlana 300b's in Manley Retro's. That is what came with the amps probably 17 years ago. They are hard to find now, so I have a few spares on hand. When they get used up, I may have to go to the big league 300b's like you and Jonathan. Or maybe change to the Coincident amps you have, which require only one 300b per channel instead of two. The performance of the Retro's really perked up when I upgraded the rectifier tubes to some NOS Phillips recommended by Upscale Audio.
I'm using Svetlana 300b's in Manley Retro's. That is what came with the amps probably 17 years ago. They are hard to find now, so I have a few spares on hand. When they get used up, I may have to go to the big league 300b's like you and Jonathan. Or maybe change to the Coincident amps you have, which require only one 300b per channel instead of two. The performance of the Retro's really perked up when I upgraded the rectifier tubes to some NOS Phillips recommended by Upscale Audio.