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Audio and Video Talk
Valves / Vacuum Tubes
Sansui 1000A Transformers on chassis
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<blockquote data-quote="handsome" data-source="post: 759239" data-attributes="member: 772"><p>Transformer impedances might be fixed but loudspeaker impedances are not and waver from model to model as well as across the frequency range. Loadlines are therefore just approximations (in reality they are two dimensional ovals not one dimensional lines) ergo you needn't worry too much about being exact with your impedances. You can in theory mismatch your loads (e.g. 4R to 8R tap) to achieve different impedances but in a well designed transformer you will be compromising performance. Any class AB amplifier will be operating in class A at lower powers and yes the amount does depend on how much bias current you are using with the limit being how much power the valves will dissipate at idle. Therefore using lots of current will demand less HT and thus less power. In your case output transformer and the power transformer are fixed so despite using different tubes you are rather limited in output power. So don't scratch your head too much about that. Either triode or pentode operation (or make it switchable), fixed bias, 420V HT and design yourself some linear, robust and mean driver stages - have fun!</p></blockquote><p></p>
[QUOTE="handsome, post: 759239, member: 772"] Transformer impedances might be fixed but loudspeaker impedances are not and waver from model to model as well as across the frequency range. Loadlines are therefore just approximations (in reality they are two dimensional ovals not one dimensional lines) ergo you needn't worry too much about being exact with your impedances. You can in theory mismatch your loads (e.g. 4R to 8R tap) to achieve different impedances but in a well designed transformer you will be compromising performance. Any class AB amplifier will be operating in class A at lower powers and yes the amount does depend on how much bias current you are using with the limit being how much power the valves will dissipate at idle. Therefore using lots of current will demand less HT and thus less power. In your case output transformer and the power transformer are fixed so despite using different tubes you are rather limited in output power. So don't scratch your head too much about that. Either triode or pentode operation (or make it switchable), fixed bias, 420V HT and design yourself some linear, robust and mean driver stages - have fun! [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Sansui 1000A Transformers on chassis
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