{"id":353,"date":"2012-06-29T19:42:52","date_gmt":"2012-06-29T19:42:52","guid":{"rendered":"http:\/\/www.bartola.co.uk\/valves\/?p=353"},"modified":"2012-06-30T16:10:45","modified_gmt":"2012-06-30T16:10:45","slug":"4%d0%bf1%d0%bb4p1l-triode-curves","status":"publish","type":"post","link":"https:\/\/www.bartola.co.uk\/valves\/2012\/06\/29\/4%d0%bf1%d0%bb4p1l-triode-curves\/","title":{"rendered":"4\u041f1\u041b\/4P1L triode curves"},"content":{"rendered":"

4P1L triode curves<\/h1>\n
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4P1L pinout<\/figcaption><\/figure>\n

4\u041f1\u041b (or\u00a04P1L) is probably one of my favourite valves. It was an unknown device to me until was suggested by some friends in the forum. Many discarded it as being a howling beast in pre-amp stages :). I found that albeit it can be microphonic, this can be controlled to a certain extent, but in my opinion this is a great valve in most of the roles: pre-amp, driver or output stage. Preferably is such a linear valve that can easily match 2A3 and 300B characteristics (when arranged in parallel) at a fraction of their cost. You can get a view of this beauty in the datasheet here<\/a>.<\/p>\n

Looking at the specifications, the key points to highlight are:<\/p>\n\n\n\n
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