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| Subject: | Re: LF: RE: LPF for a valve based (tube based) LF amp? |
| From: | "Dr. Wolf Ostwald" <[email protected]> |
| Date: | Fri, 4 Aug 2017 17:23:31 +0200 |
| In-reply-to: | <[email protected]> |
| References: | <[email protected]> <C0B5249881FC460BA529228D1E0842AD@Clemens0811> <[email protected]> <B3676C0A1ABB4D099EEC763FA0AC2D9B@Clemens0811> <[email protected]> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
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Hi Chris and Clemens,surely a Pi-circuit provides a much greater selectivity than an ordinary push-pull amp by itself. Which resembles a frequency multiplier. If one does not need many bands to cater to, a so called Pi-L circuit does an extra 10db attenuation of harmonics on the average. it does consists of a series L with output of the traditional Pi-circuit forming an extra selctive component with the output C , which is to ground. All commercial RF amps by Collins Radio Corp. had Pi-L outputs. A bit tricky to adjust on multi band amps, but on a monoband amp its just a fixed inductivity. Needles to say that an outboard 5-7-or even 9 pole Tchebycheff filter does much better. I use a 3 and a 5 pole in series. Just as it was developed. And here working on the tube amp as well. 73 de wolf df2py |
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