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Gabe001 · 15th Sep 2021, 10:26 am

Thanks Jerry

I did try with 2x4ohm speakers in parallel (it's all I've got) and I've got ample volume. The problem with using the phone is that not all apps output identical volume signals, Spotify being on the lower volume end of the spectrum. In any case, I'll be fitting a krc-86b into this, which is generally louder than my phone so I think, even accounting for the NFB attenuation and the effect of reducing the grid bias further, I'll be ok. If not I'll switch to the 6v6s and take my chances.

It's been a good experience overall, and I found this whole exercise extremely stimulating. Many thanks to all those who contributed.

I'll post a video when all is done, but I've still got some work to do - NFB, base (wooden), speaker terminals, pilot lamp, fuse etc so it may be a few more weeks.

15th Sep 2021, 10:26 am	#56
Gabe001 Octode Join Date: Oct 2019 Location: Stockport, Greater Manchester, UK. Posts: 1,641	Re: First valve amplifier build Thanks Jerry I did try with 2x4ohm speakers in parallel (it's all I've got) and I've got ample volume. The problem with using the phone is that not all apps output identical volume signals, Spotify being on the lower volume end of the spectrum. In any case, I'll be fitting a krc-86b into this, which is generally louder than my phone so I think, even accounting for the NFB attenuation and the effect of reducing the grid bias further, I'll be ok. If not I'll switch to the 6v6s and take my chances. It's been a good experience overall, and I found this whole exercise extremely stimulating. Many thanks to all those who contributed. I'll post a video when all is done, but I've still got some work to do - NFB, base (wooden), speaker terminals, pilot lamp, fuse etc so it may be a few more weeks.