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I was a little concerned about that as well.? I actually triple checked everything I did before applying power. I used the cold neutralization process from the conversion article and added the trimmer cap for 10m as recommended. Apparently everything went fine with the conversion. I chose the 6883Bs over the 6146 in order to get the 100+W output. The 6883s require a higer grid voltage than the 6146s but the article and the schematic provided gave the specifics on how to install the grid boost circuit.?

Don't know if I answered your question but the conversion work for me. My first contact after going back on the air was in Scotland and my report was 59 at 100W with a Cushcraft Ringo Ranger at about 10m. My 2nd contact was just yesterday afternoon in Iowa, again 59 but at 50W with the same antenne only at about 4m (trying to fine tune since SWR was 2+). Today's contact was in Oregon with same antenna setup and about 50W. All things considered I'm very happy with the rigs performance. Tomorrow I hope to get the antenna back up to its 10m height and I expect? the SWR will come down.

I realize this was a bit long and maybe a bit disconnected but overall the 6883s are actual beam power tubes AC BFF they seem to be working well .... the rig? actually runs a bit cooler as well.

73, N1BHE