UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Quad 22 KT66 to 6L6 with Cathode resistor increase?

joebog1 · 16th Sep 2022, 9:45 pm

Thanks Herald,
Slap, yes my fault and you are correct. The 5B/254 has the topcap, the CV391 does NOT have a topcap, but it does have higher grid plate capacitance. The loctal bases require the same chassis cutout as octals so there is no chassis butchery to happen.

http://www.r-type.org/exhib/abv0089.htm

http://www.r-type.org/exhib/aaa0035.htm

Either way, ( topcap or not ) they are excellent audio bottles, and both have full voltage ratings.

Joe

16th Sep 2022, 9:45 pm	#10
joebog1 Banned Join Date: Jun 2015 Location: Mareeba, North Queensland, Australia Posts: 2,704	Re: Quad 22 KT66 to 6L6 with Cathode resistor increase? Thanks Herald, Slap, yes my fault and you are correct. The 5B/254 has the topcap, the CV391 does NOT have a topcap, but it does have higher grid plate capacitance. The loctal bases require the same chassis cutout as octals so there is no chassis butchery to happen. http://www.r-type.org/exhib/abv0089.htm http://www.r-type.org/exhib/aaa0035.htm Either way, ( topcap or not ) they are excellent audio bottles, and both have full voltage ratings. Joe