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Transformer design, tube data

12/9/2004 4:16 PM
Andy	Transformer design, tube data Hello, I was just at a website on transformer design that is baffling me. The author states ( quote ): As an example, you might want to design an output transformer for a single pair of 6L6 output tubes. From the tube data books, you determine that a pair of 6L6's will put 40-50W in Class AB push pull into a 4400 ohm plate to plate impedance. ( end quote ) OK, the 50W output was easy enough to find on the data sheet, but where is he getting 4400 ohm plate to plate impedance from? I'm not seeing any combination of numbers that result in 4400. Also, on many data sheets, there are often 2, 3 or more data sections for the same thing...for instance, Class AB2 Push/Pull might have three sections, and all the numbers ( well, most ) are different. How can you have 3 sets of differing data for the same configuration? As an example, I was able to find one section of Class AB1 Push/Pull that provided an output of 24W, which is what I would expect. However, the other two sections of CLass A/B Push/Pull had different output wattages, etc, as did all of the Class AB2. How do I know which one I need to reference? Probably stupid newbie questions, I'm sure, but any assistance and patience you could throw my way will be greatly appreciated. Thanks, Andy

12/9/2004 4:16 PM

Andy

Transformer design, tube data

Hello,

I was just at a website on transformer design that is baffling me. The author states ( quote ):

As an example, you might want to design an output transformer for a single pair of 6L6 output tubes. From the tube data books, you determine that a pair of 6L6's will put 40-50W in Class AB push pull into a 4400 ohm plate to plate impedance. ( end quote )

OK, the 50W output was easy enough to find on the data sheet, but where is he getting 4400 ohm plate to plate impedance from? I'm not seeing any combination of numbers that result in 4400. Also, on many data sheets, there are often 2, 3 or more data sections for the same thing...for instance, Class AB2 Push/Pull might have three sections, and all the numbers ( well, most ) are different. How can you have 3 sets of differing data for the same configuration? As an example, I was able to find one section of Class AB1 Push/Pull that provided an output of 24W, which is what I would expect. However, the other two sections of CLass A/B Push/Pull had different output wattages, etc, as did all of the Class AB2. How do I know which one I need to reference?

Probably stupid newbie questions, I'm sure, but any assistance and patience you could throw my way will be greatly appreciated.

Thanks,

Andy

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