This looks like a nice simple project. I do have a few questions though.
Does this amp need a preamp to drive, or are you using a line level source that already has a volume control?
Doesn't a pentode amp typically have negative feedback?
What value of resistor would be appropriate if one were to strap the pentode as a triode? (I already have several nice non-ultalinear 5K transformer sets ).
I see that Edcor makes a transformer in their GXSE line ( GXSE5-8-5.5K) that has better bandwidth (40 hz rather than 70 hz) but less power capacity (only 5 watts). The price is the same. Do you think it would work ok?
Thanks in advance.
John