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Audio and Video Talk
Valves / Vacuum Tubes
2a3 or 300b?
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<blockquote data-quote="handsome" data-source="post: 359452" data-attributes="member: 772"><p>300B uses a 5V @ 1.2A filament 2A3 uses a 2.5V @ 2.5 filament. They also have different biasing requirements and different maximum plate voltages. It is possible to build an amp that could use both but the complexity seems very high..it would essentially be two amplifiers in one. The output transformers and driver tubes could be shared be shared. But the bias networks, HT and filament supplies would all have to be different. You could run the 300B at a lower voltage to simplify the PSU but then the tube is not operating at optimum. Seems like a lot of effort......</p></blockquote><p></p>
[QUOTE="handsome, post: 359452, member: 772"] 300B uses a 5V @ 1.2A filament 2A3 uses a 2.5V @ 2.5 filament. They also have different biasing requirements and different maximum plate voltages. It is possible to build an amp that could use both but the complexity seems very high..it would essentially be two amplifiers in one. The output transformers and driver tubes could be shared be shared. But the bias networks, HT and filament supplies would all have to be different. You could run the 300B at a lower voltage to simplify the PSU but then the tube is not operating at optimum. Seems like a lot of effort...... [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
2a3 or 300b?
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