6DJ8 or 12AT7

hags · 21st February 2007, 03:28 PM

Looking for opinions on and experieinces with choosing between the 6DJ8 and 12AT7, particularly in a driver circuit. I'm leaning towards the 6DJ8 for voltage gain and splitter.
Thanks.

SY · 21st February 2007, 03:33 PM

How much voltage do you want to swing? What sort of configuration?

hags · 21st February 2007, 11:50 PM

not sure, still hunting for the best idea, either a cascode gain circuit or used in a long tailed pair splitter circuit.
I hear pros and cons for each, most seem personal preference not performance specs.

planet10 · 22nd February 2007, 06:54 AM

What are you trying to drive?

dave

SY · 22nd February 2007, 12:16 PM

I've done extensive work with both those tubes in driver circuits and have lots of measurements on both. Each has its use and virtue.

The ECC88 has a lower mu, lower Miller capacitance, higher transconductance, and generally needs higher current. The 12AT7 has double the gain, takes a higher rail voltage, and has better linearity in grounded cathode at large voltage swings. So, once you decide what sort of splitter you want and what you need it to do, the tube choice can be rationally made.

21st February 2007, 03:28 PM	#1
hags diyAudio Member Join Date: Nov 2004 Location: Chain o' Lakes	6DJ8 or 12AT7 Looking for opinions on and experieinces with choosing between the 6DJ8 and 12AT7, particularly in a driver circuit. I'm leaning towards the 6DJ8 for voltage gain and splitter. Thanks.

21st February 2007, 03:33 PM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	How much voltage do you want to swing? What sort of configuration? __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

22nd February 2007, 06:54 AM	#4
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	What are you trying to drive? dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

22nd February 2007, 12:16 PM	#5
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	I've done extensive work with both those tubes in driver circuits and have lots of measurements on both. Each has its use and virtue. The ECC88 has a lower mu, lower Miller capacitance, higher transconductance, and generally needs higher current. The 12AT7 has double the gain, takes a higher rail voltage, and has better linearity in grounded cathode at large voltage swings. So, once you decide what sort of splitter you want and what you need it to do, the tube choice can be rationally made. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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21st February 2007, 11:50 PM	#3
hags diyAudio Member Join Date: Nov 2004 Location: Chain o' Lakes	not sure, still hunting for the best idea, either a cascode gain circuit or used in a long tailed pair splitter circuit. I hear pros and cons for each, most seem personal preference not performance specs.

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