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: Chicagoland Blog Entries: 1	How much voltage do you want to swing? What sort of configuration? __________________ If there's a sucker born every minute, where do the rest of them come from?

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: 5	What are you trying to drive? dave __________________ community sites t-linespeakers.org, frugal-horn.com, frugal-phile.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: Chicagoland 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. __________________ If there's a sucker born every minute, where do the rest of them come from?

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

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.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Ecc81 12at7	316a	Swap Meet	0	30th May 2008 11:51 AM
12at7 LTP CCS	wicked1	Tubes / Valves	11	23rd April 2008 08:28 AM
6V6 ->EL84 with 12AT7?	zxx123	Tubes / Valves	8	5th April 2006 06:12 PM
Can I use 12AT7?	Ahmad_tbp	Tubes / Valves	6	25th January 2006 06:11 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read