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paulsherwin · 27th Sep 2009, 5:28 pm

Are you sure you've identified the pins properly? G2 (pin 4) should go to the anode and G3 (pin 1) to the cathode in a triode wired EL34.

An EL34 is an odd valve to use in experiments like this since it is a very high power output valve. Something like an EF80 or, if you prefer octal valves, an EF36/37/37A/39 would work just as well and use much less power. I'm also unsure how an EL34 would perform at radio frequencies.

It's also unclear how you're applying bias to the valve.

Paul

27th Sep 2009, 5:28 pm	#2
paulsherwin Moderator Join Date: Jun 2003 Location: Oxford, UK Posts: 27,964	Re: Pentode amp experiment. Are you sure you've identified the pins properly? G2 (pin 4) should go to the anode and G3 (pin 1) to the cathode in a triode wired EL34. An EL34 is an odd valve to use in experiments like this since it is a very high power output valve. Something like an EF80 or, if you prefer octal valves, an EF36/37/37A/39 would work just as well and use much less power. I'm also unsure how an EL34 would perform at radio frequencies. It's also unclear how you're applying bias to the valve. Paul