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RE: Cathodyne VS LTP

Thanks Douglas, I'll look for those. It's becoming evident from additional SPICE work and calculations that I'll be short of gain in this design (EF86 - 6C4 cathodyne - 5881 push-pull). Even with the EF86 operating at highest gain, 20 dB of feedback will create a slight shortfall.

The chassis is already cut for a 7-pin in the splitter position, so the choices are limited. The easiest option would be to incorporate positive feedback from the 6C4 back to the EF86, similar to the RCA 30W design. I believe this technique will approximately double the total driver gain. The other possibility is to replace the cathodyne with a 6J6 LTP like I mentioned. That would provide better than a X10 increase. SPICE is telling me the 6J6 is a cleaner approach, but I'm not convinced yet. It would be great if I could find an example of this somewhere. Thanks again for your suggestion!









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