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EL84, EL844, EL86/6CW5

smolder

Platinum Supporting Member
Messages
14,394
anyone have experience swapping these around in a small (18-ish) watt circuit? Thoughts on tone and volume?
 

pdf64

Member
Messages
7,643
I would be concerned that el844 would suffer significant overdissipation if subbed into a regular 18 watt type amp.
 

smolder

Platinum Supporting Member
Messages
14,394
I would be concerned that el844 would suffer significant overdissipation if subbed into a regular 18 watt type amp.
Agreed, but as I'm just formulating plans for the build, I can make those adjustments ahead of time.
 

pdf64

Member
Messages
7,643
OK; to accommodate power tube types with differing plate dissipation ratings, my suggestion would be to include arrangements to vary the VB+, eg switched taps for the PT B+ winding, VVR, as my experience is that the overdriven tone of cathode biased guitar amps suffers when the operating conditions moves too far from class A.
 




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