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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+Plate\s+Choke\s+question\s*$/: 16 ]

Total 16 documents matching your query.

1. [Amps] Plate choke question (score: 1)
Author: Charlie Ocker <N9CO@aol.com>
Date: Tue, 10 Feb 2009 05:37:04 -0600
Greetings, I'm building my first homebrew amp. Making slow but steady progress. It is a pair of 3-500z in grounded grid. I have acquired an old National R-175A plate choke. It is in good shape, and I
/archives//html/Amps/2009-02/msg00255.html (6,755 bytes)

2. Re: [Amps] Plate choke question (score: 1)
Author: "Carl" <km1h@jeremy.mv.com>
Date: Tue, 10 Feb 2009 11:31:01 -0500
You can also buy a choke from Ameritron that has about that inductance on one form. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contes
/archives//html/Amps/2009-02/msg00261.html (8,156 bytes)

3. [Amps] Plate Choke question (score: 1)
Author: "Steve Flood" <kk7uv@bresnan.net>
Date: Sat, 9 Nov 2013 12:55:31 -0700
For a 1kw amp designed for 10m thru 20m only (5 bands), is there a plate choke available that is optimized for this purpose? Would it have all resonances above 30 Mhz? Thanks, Steve KK7UV ___________
/archives//html/Amps/2013-11/msg00176.html (6,775 bytes)

4. Re: [Amps] Plate Choke question (score: 1)
Author: "Carl" <km1h@jeremy.mv.com>
Date: Sat, 9 Nov 2013 15:10:23 -0500
The 50uH one in all the Heath SB amps fits that role. Carl KM1H For a 1kw amp designed for 10m thru 20m only (5 bands), is there a plate choke available that is optimized for this purpose? Would it h
/archives//html/Amps/2013-11/msg00178.html (7,692 bytes)

5. Re: [Amps] Plate Choke question (score: 1)
Author: peter chadwick <g8on@fsmail.net>
Date: Sat, 09 Nov 2013 22:14:36 +0100
BUT at 3.5 MHz, that 50 microhenries has an inductive reactance of 1100 ohms, and needs an extra 50pF of plate tuning capacity. Now let's assume a plate voltage of say 2500 volt and a minimum plate v
/archives//html/Amps/2013-11/msg00179.html (8,009 bytes)

6. Re: [Amps] Plate Choke question (score: 1)
Author: "Leigh Turner" <invertech@frontierisp.net.au>
Date: Sun, 10 Nov 2013 10:36:40 +1030
Good comments and analogy here Peter...many homebrew tube amplifier hams (and the occasional commercial amp designer) often deploy inadequate plate choke RF bypassing / decoupling on the B+ line...es
/archives//html/Amps/2013-11/msg00181.html (9,179 bytes)

7. Re: [Amps] Plate Choke question (score: 1)
Author: "Hardy Landskov" <n7rt@cox.net>
Date: Sat, 9 Nov 2013 17:31:09 -0700
But the caveat to this whole question was he stated that the amp was to be used on 20 to 10 meters only. But excellent comments about low band operation. I have been "burned" by inadequate RF choke X
/archives//html/Amps/2013-11/msg00182.html (10,303 bytes)

8. Re: [Amps] Plate Choke question (score: 1)
Author: "Carl" <km1h@jeremy.mv.com>
Date: Sat, 9 Nov 2013 20:01:11 -0500
BUT again, he clearly stated he was interested in 20-10M including WARC with no resonances. Anybody with a modicum of amp experience understands the basics and the Heath choke fits the job. It should
/archives//html/Amps/2013-11/msg00183.html (9,781 bytes)

9. Re: [Amps] Plate Choke question (score: 1)
Author: peter chadwick <g8on@fsmail.net>
Date: Sun, 10 Nov 2013 11:22:51 +0100
So it's still about 320mA and 1.5 volts across the bypass cap. If Q =150, 3 watts in the choke, Q=75, 6 watts in the choke, etc. Actually, depending on the bypass cap and the length of leads, it coul
/archives//html/Amps/2013-11/msg00199.html (11,705 bytes)

10. Re: [Amps] Plate Choke question (score: 1)
Author: "Carl" <km1h@jeremy.mv.com>
Date: Sun, 10 Nov 2013 07:34:29 -0500
I much prefer tossing the so called VHF choke and replacing with a wirewound glitch resistor. The WW has inductance and serves a dual purpose wheras Ive seen a few amps where the "VHF" choke cause pr
/archives//html/Amps/2013-11/msg00203.html (13,207 bytes)

11. Re: [Amps] Plate Choke question (score: 1)
Author: peter chadwick <g8on@fsmail.net>
Date: Sun, 10 Nov 2013 13:47:06 +0100
Presence of a glitch resistor is a 'given', Carl. I have one in the power supply: it has to be effective since it's nichrome and we all know that nichrome is the magic answer to all evils! An 80 ohm,
/archives//html/Amps/2013-11/msg00206.html (8,185 bytes)

12. Re: [Amps] Plate Choke question (score: 1)
Author: "Carl" <km1h@jeremy.mv.com>
Date: Sun, 10 Nov 2013 09:20:54 -0500
I place the glitch resistor right at the base of the plate choke so it will be effective as a RFC and the PS end bypassed. Something in the vicinity of 7-10uH is fine and if something bigger as a res
/archives//html/Amps/2013-11/msg00207.html (9,792 bytes)

13. Re: [Amps] Plate Choke question (score: 1)
Author: peter chadwick <g8on@fsmail.net>
Date: Sun, 10 Nov 2013 15:33:06 +0100
Carl, Do they suppress voodoo? 73 Peter G3RZP _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2013-11/msg00208.html (8,114 bytes)

14. Re: [Amps] Plate Choke question (score: 1)
Author: "Steve Flood" <kk7uv@bresnan.net>
Date: Sun, 10 Nov 2013 11:47:59 -0700
wirewound glitch resistor. The WW has inductance and serves a dual >purpose wheras Ive seen a few amps where the "VHF" choke cause problems. Thanks for the advice. I'll wind a 50uH choke and use a 1
/archives//html/Amps/2013-11/msg00222.html (8,688 bytes)

15. Re: [Amps] Plate Choke question (score: 1)
Author: "Carl" <km1h@jeremy.mv.com>
Date: Sun, 10 Nov 2013 16:16:40 -0500
A 1000pf is fine for those frequencies and nothing will get thru the Nichrome Nibbler and the last cap. Carl KM1H wirewound glitch resistor. The WW has inductance and serves a dual wheras Ive seen a
/archives//html/Amps/2013-11/msg00224.html (9,748 bytes)

16. Re: [Amps] Plate Choke question (score: 1)
Author: "Carl" <km1h@jeremy.mv.com>
Date: Sun, 10 Nov 2013 20:51:53 -0500
The voodoo from Somis CA is too strong for many raised on multiple choice or box top licenses. Carl KM1H Carl, even use the nichrome wire from one of those voodoo supressors, Do they suppress voodoo?
/archives//html/Amps/2013-11/msg00225.html (9,020 bytes)

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