UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Argus25 · 7th Mar 2018, 4:01 am

It doesn't matter greatly that the grids of two valves are connected together and just the one 1k2 Grid stopper used. It just doubles the capacitance that the 1k2 feeds and determines the HF roll off. If you went to a separate Grid resistor for each valve, which might be a tad better as you can have each close to the pin on the valve socket, I would recommend increasing the value of each to 2k4.
Hugo.

7th Mar 2018, 4:01 am	#28
Argus25 No Longer a Member Join Date: Oct 2016 Location: Maroochydore, Queensland, Australia. Posts: 2,679	Re: Golden Ear Laboratory Amplifier Build It doesn't matter greatly that the grids of two valves are connected together and just the one 1k2 Grid stopper used. It just doubles the capacitance that the 1k2 feeds and determines the HF roll off. If you went to a separate Grid resistor for each valve, which might be a tad better as you can have each close to the pin on the valve socket, I would recommend increasing the value of each to 2k4. Hugo.