In Reply to: Bass control with low powered tube amps posted by tomtom58 on October 24, 2016 at 07:41:16:
Any tube amp with few exceptions will interact with a woofer and boost bass at speaker impedance peaks, the box resonance and the port resonance. This is true for any amp with high output impedance(low damping factor) tube or not(some solid state amps without negative feedback). How high the bass resonances depends on how high the impedance peaks and how high the output impedance. Wire too thin will increase the affect by making the effective damping factor even higher.
Push/pull tube amps tend to have higher damping factor because they usually use negative feedback where SET amps rarely do. But the damping factor is still poor enough to affect frequency response in almost every case, just less so. The only tube amps I know with little affect are the old Melos amps with a damping factor of 20 but these are very high power pus/pull amps although they are triode output and they do use a fair amount of feedback.
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- RE: Bass control with low powered tube amps - hahax@verizon.net 19:35:55 10/24/16 (0)