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RE: If it looks like a duck, quacks like a duck

Posted by Triode_Kingdom (A) on October 25, 2016 at 07:58:07

In Reply to: If it looks like a duck, quacks like a duck posted by Chip647 on October 25, 2016 at 07:32:14:

I looked again after reading your post, hadn't noticed the difference in max anode voltage previously. There must be a typo in the data, because even though 250V is the stated maximum, the chart of operating conditions shows it being used at 300V.

What's even more interesting is that in spite of basic characteristics for the two tubes being identical, the two charts aren't. For example, the 300V column with Rp of 240K shows different cathode resistors for the two tubes. The 6SL7 is measured with 2,100/2,500 Ohms (depends on the next grid load Rs), but the 6AQ7 is measured with 3,600/3,900 Ohms. Also, the 6SL7 exhibits somwewhat more gain than the 6AQ7 in this area of the chart, despite next stage grid resistors being the same. Oh well, those are minor differences, not enough to justify a claim that the two aren't the same.

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