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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*LF\:\s+RE\:\s+LPF\s+for\s+a\s+valve\s+based\s+\(tube\s+based\)\s+LF\s+amp\?\s*$/: 6 ]

Total 6 documents matching your query.

1. LF: RE: LPF for a valve based (tube based) LF amp? (score: 1)
Author: "Clemens Paul" <[email protected]>
Date: Fri, 4 Aug 2017 14:10:32 +0200
Hi Chris, at the risk to state the obvious: A LPF of a solid state PA has 50 Ohms in- and output impedance. A tube type PA needs a LPF which transforms from several kOhms on the tube side to 50 Ohms
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-08/msg00005.html (11,617 bytes)

2. Re: LF: RE: LPF for a valve based (tube based) LF amp? (score: 1)
Author: "Dr. Wolf Ostwald" <[email protected]>
Date: Fri, 4 Aug 2017 15:24:01 +0200
hi ! i think the question was about the LPF , not the tank circuit. LPF yes, if its 50 Ohms to 50 Ohms, same for all types of RF-generator. If components like feed lines and generator and load impeda
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-08/msg00006.html (9,720 bytes)

3. Re: LF: RE: LPF for a valve based (tube based) LF amp? (score: 1)
Author: "Dr. Wolf Ostwald" <[email protected]>
Date: Fri, 4 Aug 2017 15:34:49 +0200
hi ! I found an online calculator that allows to set the Q and the impedance for a tank circuit. http://people.physics.anu.edu.au/~dxt103/calculators/pi_tank.php most others are only giving a resonan
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-08/msg00007.html (10,058 bytes)

4. RE: LF: RE: LPF for a valve based (tube based) LF amp? (score: 1)
Author: "Clemens Paul" <[email protected]>
Date: Fri, 4 Aug 2017 15:36:22 +0200
Hi Wolf, ok about the tank circuit. Do you think that it does not provide enough attenuation for the harmonics so that you need an extra LPF on LF? 73 Clemens DL4RAJ
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-08/msg00008.html (10,665 bytes)

5. Re: LF: RE: LPF for a valve based (tube based) LF amp? (score: 1)
Author: Chris Wilson <[email protected]>
Date: Fri, 4 Aug 2017 15:34:06 +0100
Hello Clemens, Thanks for the replies, I was wondering this myself as few tube amps use an LPF.... Opinions very welcome (and needed ;)) I was going to drive it with one of my FET amps on a lowish vo
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-08/msg00009.html (10,890 bytes)

6. Re: LF: RE: LPF for a valve based (tube based) LF amp? (score: 1)
Author: "Dr. Wolf Ostwald" <[email protected]>
Date: Fri, 4 Aug 2017 17:23:31 +0200
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 cate
/rsgb_lf_group-archives/html/rsgb_lf_group/2017-08/msg00010.html (10,703 bytes)


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