📌 INFORMATIVA COPYRIGHT — I diritti appartengono al legittimo proprietario. Fonte: worldwidedx.com — 🔗 Leggi l'articolo originale
Homebrew 4cx300a amp grid driven:
I found a better air variable for my Load cap. Installed and working OK 10-40M but I need to estimate the C values for 80M. New Load cap is another 2 section Johnson, 3kv rated but the smallest section <10pF and both sections equal 205pF. I use a CRL 2500 series, progressively shorting switch to add capacitance for 40 & 80m. I had 40M working fine on the old load cap somewhere around 320pF and it working OK again in that range so that’s my starting point…
I found a better air variable for my Load cap. Installed and working OK 10-40M but I need to estimate the C values for 80M. New Load cap is another 2 section Johnson, 3kv rated but the smallest section <10pF and both sections equal 205pF. I use a CRL 2500 series, progressively shorting switch to add capacitance for 40 & 80m. I had 40M working fine on the old load cap somewhere around 320pF and it working OK again in that range so that’s my starting point…
![[Valid RSS]](https://www.iz4wnp.it/wp-content/uploads/2026/04/valid-rss-rogers.png "Validate my RSS feed")