Thanks Ian
So the poor damping is a result of the output stage/feedback side rather than the transformers ability to present a low impeadance to its load, Ok I get that.
Schoolboy error on impeadance
As the job of the output transformer is primaraly to match impeadance would that also suggest that the amps using single pair ( for say 50W output) and not having a great deal of feedback were just not well designed in the first place. The designers going more for "how mutch can we get out" rather than better quality sound
: I realise that the soft soggy distortion was perhaps unintentional from the point of view of the amp designers back in the day. It did however become a sought after sound for guitarists.
I have seen the softer clip you refer to when load testing amps on a scope (as well as hearing them singing. They realy seemed to come alive). If I remember this was only realy soft at the onset of clipping. If you drove them further into distortion the wave would square up. Not nearly as dramatic as seeing clipping on a solid state amp tho.
So when you get to a serious number of valve pairs, 10 for example are you still looking at the effect of the valve outputs as being the major limitation on damping factor or would the design/quality of the output TX come into play. I assume that you would eventually reach a point where the losses in the TX would become a limiting factor. Or, do you naturaly counter this by having heavier gauge wire/More meat in the core construction of the Transformer to handle the extra power. Just how low you could go with the overall output impeadance of the amp
: Can you get close to a solid state amp of similar power
:
Oh and is that 10A at idle or when at full output
:
Lots of questions but its fun to learn more about these types of amp. Very few people know mutch about valve these days and my own knowledge is fairly rusty smiley32
Thanks
Daz