Harmony H303A voltages/quiet amp

[Ampere]

Hi
schematic:

Having low output on this supposedly 8W amp. I'm suspecting the following.

The plate voltage for the 12AU6...

[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...