01-09-2021, 08:08 AM
They are all good choices although I have never had any 1j18b's to try them. The 1j24b's are good in that they take very little heater current so for a battery powered setup they are ideal. I think that is sets the Russians used 1j29b's in RF and 1j24b's in IF stages. None of the rod pentodes are variable mu though. This is one reason why I am considering other than a pure rod pentode superhet set, another, lesser reason, being that I have read somewhere that the 1j29b's in the RF amp position of Russian radios could be readily overloaded hence they maybe have poor cross mod performance? A point that I would consider for myself as I have better valves for this position.
It's interesting what you say about Radio Caroline Trevor. It's good that you are getting it so well - a good design. Here I find that Caroline works well during the day but a foreign station chops in and out on the same frequency at dusk. I am almost never up late at night to even try to see if the conditions change again.
Tracy
It's interesting what you say about Radio Caroline Trevor. It's good that you are getting it so well - a good design. Here I find that Caroline works well during the day but a foreign station chops in and out on the same frequency at dusk. I am almost never up late at night to even try to see if the conditions change again.
Tracy
