Srrp output question

woody · 31st August 2009, 04:33 PM

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

woody · 31st August 2009, 04:41 PM

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

piero7 · 31st August 2009, 05:35 PM

Upload the images on www.tinypic.com then copy the direct link image into the tag IMG (insert image button)

woody · 31st August 2009, 09:02 PM

Well I hope that worked.

Geek · 1st September 2009, 12:05 AM

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!

vinylkid58 · 1st September 2009, 12:41 AM

Quote:

Originally Posted by Geek

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

Geek · 1st September 2009, 12:48 AM

Hi Jeff,

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

Cheers!

vinylkid58 · 1st September 2009, 12:57 AM

Yes that would be correct. Sorry, not trying to confuse the issue.

Jeff

aardvarkash10 · 1st September 2009, 01:34 AM

[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.

woody · 1st September 2009, 01:40 AM

Thanks for the feedback. But I would still like to know what the output
voltage would be at clipping.

31st August 2009, 04:33 PM	#1
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	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

1st September 2009, 01:34 AM	#9
aardvarkash10 diyAudio Member Join Date: Mar 2007 Location: Auckland, NZ	[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. __________________ Yes, conservatism thrives on low intelligence and poor information. But the liberals in politics... continue to back off, yielding to the supremacy of the stupid. It's turkeys all the way down. - George Monbiot, guardian.co.uk, 6 Feb 2012

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31st August 2009, 04:41 PM	#2
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	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

31st August 2009, 05:35 PM	#3
piero7 diyAudio Member Join Date: Apr 2009 Location: Matera	Upload the images on www.tinypic.com then copy the direct link image into the tag IMG (insert image button)

31st August 2009, 09:02 PM	#4
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	Well I hope that worked.

1st September 2009, 12:05 AM	#5
Geek diyAudio Member Join Date: Sep 2004	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!

1st September 2009, 12:48 AM	#7
Geek diyAudio Member Join Date: Sep 2004	Hi Jeff, Cyrillic 6H30 == english 6N30, correct? TDSL seems to think so: http://tdsl.duncanamps.com/tubesearch2.php?TSD=6N30 Cheers!

1st September 2009, 12:57 AM	#8
vinylkid58 diyAudio Member Join Date: May 2005 Location: Victoria, B.C.	Yes that would be correct. Sorry, not trying to confuse the issue. Jeff

1st September 2009, 01:40 AM	#10
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	Thanks for the feedback. But I would still like to know what the output voltage would be at clipping.

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