Harmony H 303 A build from scratch

[Rob55]

I, a novice, recently acquired a 4” speaker attached to a 2x4x6 chassis with a tube complement of two 50C5 and one 12AU6. I plan to use the current cabinet....

[max]

Hello,

I am restoring a Harmony 303a. I have gone through this amp entirely, but I am still getting a slight distortion on the attack of chords...

[dustyoldamp]

I have a Silvertone 1470 that sports a 12AU6 preamp tube and was wondering if anyone is aware of a replacement tube that will work in it's place?