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1. 25 turn pot in the filament supply.  For the life of me I can't source a 25 turn pot.  The 10 turn Bourns 3590 is the closest I can find.  Do I need to keep looking for a more sensitive pot or do you think 10 turn is manageable?
2. The fuse.  You show a fuse on this schematic (that traces back to the B+ supply) but omit it on the  6-Channel schematic that I linked to earlier in the thread.  Do you use this fuse or have you removed it?
3. HP Filter 50R.  In the schematic above you use a 50R resistor leading into the 6E6P but omit it on the 6 Channel schematic.  As far as I can tell it is not required for the high-pass RL filter so do you use the 50R or has it been removed?
4. Changing valves.  Could you please explain to me the process of changing valves, say from 45 to YO186?  Please treat me as an imbecile in this regard.  I am very interested in the process and think that it will help me better understand its use.  If I were to guess I would say shut down the amps; remove 45; install YO186; turn on amps; adjust 100R pot to read ???? through the measuring points; press play.  Or maybe it is simpler than that...in some photographs I notice a switch on the "DHT Island" but do not know what it is for.

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