Tube DIY Asylum

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If you are looking to boost your B+

Posted by DAK on February 11, 2017 at 08:19:46:
you can add a small cap before L1. Depending on how many volts. My experience on playing with a small cap is that a value under .5uf will add around 5 volts. At 1uf it will be around 10v. By 5uf the voltage gain will be nearly the same as a capacitor input filter. On one amp i installed a 5uf vitaminQ on a switch so i can have it in or out of circuit and the difference is large. with no C1 340vdc with 5uf added 450vdc depending on the load.