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Old 17th September 2013, 10:39 PM   #1
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Default Easy question about tube data sheet

On the second page of this pdf, there's a section for "general operation and characteristics". What is the difference in the two columns of data?

I'm trying to figure out what my max plate voltage is for these tubes.


http://tubedata.milbert.com/sheets/049/6/6Y6GA.pdf


Does the "class A" chart include A/B or no?

I'm studying the electrical aspects of a 2 x 6y6 tube rectified power amp.
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Old 17th September 2013, 10:45 PM   #2
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Quote:
Originally Posted by Sea Biscuit View Post
What is the difference in the two columns of data?

I'm trying to figure out what my max plate voltage is for these tubes.
Two different suggested operating conditions and 200V, in that order.
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Old 17th September 2013, 10:54 PM   #3
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So they just show a set of data for 135v plate voltage just for the hell of it, and doesn't indicate any sort of max rating?
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Old 17th September 2013, 11:12 PM   #4
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Tell me if this is correct.

2 x 6y6ga tubes each get 200v to the plates with 12.5W dissipation each. That equates to 62.5mA that each tube needs.

Let's say these two tubes get B+ through a 6x5gt rectifier that's rated for max rectified current to be 70mA. Certainly sounds like it wouldn't work...

here's the rectifier data: http://www.r-type.org/pdfs/6x5g.pdf


I'm gonna come up with some more stupid questions, I'm sure.
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Old 18th September 2013, 07:23 AM   #5
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Yes, 6X5GT is too "weak" to supply 2 x 6Y6GA.
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Old 18th September 2013, 07:25 AM   #6
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Quote:
Originally Posted by Sea Biscuit View Post
So they just show a set of data for 135v plate voltage just for the hell of it, and doesn't indicate any sort of max rating?
MAX ratings were on the first sheet. Note, this is a rather brief data sheet. Most have a lot more info.

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Old 18th September 2013, 08:30 AM   #7
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Quote:
Originally Posted by Sea Biscuit
So they just show a set of data for 135v plate voltage just for the hell of it, and doesn't indicate any sort of max rating?
They tell you that max rating is 200V. 135V is both a recommended screen voltage and, perhaps, a typical supply rail for an AC/DC set in the USA? Or a set with only a heater transformer, but directly rectified mains?
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Old 18th September 2013, 11:09 AM   #8
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Eli Duttman has done a similar design using the 6Y6GA here. Eli is the well-known designer of the El-Cheapo, so you may pick up a pointer or two on the PS design.
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Old 18th September 2013, 11:17 AM   #9
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So it says the 6x5gt rectifier is rated for 210mA peak current on each anode, but only 70mA DC current? How does that work?

Does plate dissipation go against that 70mA rating of the rectifier, or only the grid dissipation?
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Old 18th September 2013, 11:36 AM   #10
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The peak current is rated "before destruction", the full-wave rectified current is 70mA per the datasheet. So that is not enough to supply two 6Y6GT for push-pull operation, since each tube would require ~65mA of idle current.
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