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Old 31st August 2009, 04:33 PM   #1
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Default Srrp output question

In the circuite below what would the maxium ac output voltage using 150v b+
and a 10k load? Would I get about the same output swing if I took the output from the top of the top cathode resistor or the bottom of the cathode resistor.

Thanks
Woody
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Old 31st August 2009, 04:41 PM   #2
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How do you post a picture? I was realy talking about a 6h30 triode with 170ohm cathode resistors and the bottom cathode with a bypass cap.

thanks,

Woody
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Old 31st August 2009, 05:35 PM   #3
piero7 is offline piero7  Italy
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Upload the images on www.tinypic.com then copy the direct link image into the tag IMG (insert image button)
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Old 31st August 2009, 09:02 PM   #4
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Click the image to open in full size.

Well I hope that worked.
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Old 1st September 2009, 12:05 AM   #5
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Hi,

Not familiar with the 6N30, but most SRPP, especially if high bias, can drive nails.

+150V isn't a lot for a totem pole, and each section will only have ~75V across them, but that looks perfect from the specs.

Anode current is rated 40mA, so 20mA through each totem would probably be a right balance for Gm, noise and tube life.

Depending on the cathode voltage needed, consider using LED's for bias... their impedance and noise is low and you can lose the cathode cap.

As for Vp-p out, that depends on what THD you want to take it at. Likely enough to cook a SS amp input stage before you even hit 0.5%



Cheers!
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Old 1st September 2009, 12:41 AM   #6
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Quote:
Originally Posted by Geek View Post
Not familiar with the 6N30, but most SRPP, especially if high bias, can drive nails.
I think that's a 6H30 in the schem. Gregg.

Jeff
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Old 1st September 2009, 12:48 AM   #7
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Hi Jeff,

Cyrillic 6H30 == english 6N30, correct? TDSL seems to think so: http://tdsl.duncanamps.com/tubesearch2.php?TSD=6N30

Cheers!
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Old 1st September 2009, 12:57 AM   #8
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Yes that would be correct. Sorry, not trying to confuse the issue.

Jeff
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Old 1st September 2009, 01:34 AM   #9
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[QUOTE=woody;1912443]In the circuite below what would the maxium ac output voltage using 150v b+
and a 10k load? Would I get about the same output swing if I took the output from the top of the top cathode resistor or the bottom of the cathode resistor.

Maths here. Also check out Mu Followers for a variation and a hi-z lo-z option.
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Old 1st September 2009, 01:40 AM   #10
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Thanks for the feedback. But I would still like to know what the output
voltage would be at clipping.
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