nyazzip wrote:ah thank you. i was only expecting one wire per channel, not two.
You can leave the wire going to the black (common) speaker binding post connected. Actually, it's probably a good idea to keep the output secondary grounded even if you're not using NFB. Although with this amp (as with all UL and pentode amps) you will probably need at least a little NFB.
also can anyone tell me what the function of adjustable resistors 30 and 31 are for?
They adjust the amount of NFB you get. For example, moving the NFB connection from the 16 ohm tap to the 8 ohm tap would require adjustment. See the manual for details.
in playing with the bias, no amount of turning seems to affect the DMM readings on R22...it reads about 0.450vdc(yes i tried the adjacent test point to make sure i was on the right one
)...do those screws turn indefinitely or what?
No, they only move ten turns. There is a little nylon worm gear inside and a metal spring finger that travels along it. If you reach the end, the finger will jump the track and land in the adjacent one. Be gentle with them, as excessive "fiddling" can damage the mechanism.
this spring i smoked R17 and R26 pretty bad by using some cheap ebay tubes without a bias check. could this be my problem...?
That don't sound good.