6C4C - 6S4S - 6B4G op points?

danFrank · 5th December 2006, 09:28 PM

Hi,
I have read here in the past that a lot of the members here like using the Russian 6C4C - 6B4G at 350 volts on the plate with about a 5K load.
My question is: What current do you run them at with 350 volts B+? Is the plate dissipation 15 watts on these Russian tubes or can they go higher with no ill effects on the life of the tube?
What is the average life of the 6C4C... 1000hrs? 2000?
Thanks in advance... Daniel

jrdmedford · 6th December 2006, 05:32 AM

There are two types of 6C4C. I have some from 1972 production
runs that are biplate. They look like the usual biplate Chinese or
USA RCA types. Then, somewhere in the 1990s, 6C4C monoplates showed up. These have a higher plate dissipation and max Va compared to the usual 6B4G. I'd not run Soviet era
6C4C past the 300V 6B4G op point. AFAIK, the Soviet era clones were build to be compatible with the Western counterparts.

You can get good NOS USSR tubes in Europe for not much money.
Polish and Lithuanian friends are good to have.

-- Jim

AndreasS · 6th December 2006, 06:51 AM

I use the old russian 6B4G only in push-pull class-A amplifiers, the operation point is 300V @ 50 mA per tube, Raa is 6,6 kOhm.

Andreas

5th December 2006, 09:28 PM	#1
danFrank diyAudio Member Join Date: May 2005 Location: California	6C4C - 6S4S - 6B4G op points? Hi, I have read here in the past that a lot of the members here like using the Russian 6C4C - 6B4G at 350 volts on the plate with about a 5K load. My question is: What current do you run them at with 350 volts B+? Is the plate dissipation 15 watts on these Russian tubes or can they go higher with no ill effects on the life of the tube? What is the average life of the 6C4C... 1000hrs? 2000? Thanks in advance... Daniel

6th December 2006, 05:32 AM	#2
jrdmedford diyAudio Member Join Date: Mar 2004 Location: Medford, MA	Brezhnev era vs. Yeltsin era 6C4C There are two types of 6C4C. I have some from 1972 production runs that are biplate. They look like the usual biplate Chinese or USA RCA types. Then, somewhere in the 1990s, 6C4C monoplates showed up. These have a higher plate dissipation and max Va compared to the usual 6B4G. I'd not run Soviet era 6C4C past the 300V 6B4G op point. AFAIK, the Soviet era clones were build to be compatible with the Western counterparts. You can get good NOS USSR tubes in Europe for not much money. Polish and Lithuanian friends are good to have. -- Jim

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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
6A3/6B4G/6S4S(2A3/2S4S) project	widowmaker	Tubes / Valves	20	31st May 2009 08:39 PM
running 6S4S/6C4C hot .. calling widowmaker	makeb4break	Tubes / Valves	27	8th February 2009 09:25 PM

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

6th December 2006, 06:51 AM	#3
AndreasS diyAudio Member Join Date: May 2005 Location: near Duesseldorf	I use the old russian 6B4G only in push-pull class-A amplifiers, the operation point is 300V @ 50 mA per tube, Raa is 6,6 kOhm. Andreas

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)