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Total 30 documents matching your query.

1. [AMPS] Screen regulator circuit needed (score: 1): Author: Bill Coleman" <n2bc@ibm.net (Bill Coleman); Date: Sat, 14 Nov 1998 21:22:09 -0500; I'm wrestling with trying to get a couple of 811s and a string of VR tubes working as a regulator on a 1KV screen supply for a 4-1000 in AB1 (early 60s handbook circuit). I picked this circuit becaus; /archives//html/Amps/1998-11/msg00197.html (8,734 bytes)
2. [AMPS] Screen regulator circuit needed (score: 1): Author: John Fielding" <johnf@futurenet.co.za (John Fielding); Date: Sun, 15 Nov 1998 14:34:32 +0200; Hi Bill - try using high voltage scan transistors from tv's. These are rated at 1500V or more for Vceo. Should be available pretty cheaply, I paid about $1 a piece a little while back. Use a smallish; /archives//html/Amps/1998-11/msg00198.html (10,292 bytes)
3. [AMPS] Screen regulator circuit needed (score: 1): Author: measures@vc.net (Rich Measures); Date: Sun, 15 Nov 1998 05:32:58 -0800; ? One needs triodes with a Mu of under 5 for pass regulator service. . ? Bipolar transistors have a secondary-breakdown problem which makes them problematic in HV pass regulator service. Power FETs; /archives//html/Amps/1998-11/msg00201.html (9,749 bytes)
4. [AMPS] Screen regulator circuit needed (score: 1): Author: John Fielding" <johnf@futurenet.co.za (John Fielding); Date: Sun, 15 Nov 1998 18:20:33 +0200; This is a multi-part message in MIME format. --=_NextPart_000_000B_01BE10C4.B9746500 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Series pass stabilisers; /archives//html/Amps/1998-11/msg00202.html (18,505 bytes)
5. [AMPS] Screen regulator circuit needed (score: 1): Author: measures@vc.net (Rich Measures); Date: Sun, 15 Nov 1998 14:11:32 -0800; Not if one uses the recommended amount of screen bleeder current. [see Figure 5 on my Web site]. For tetrodes with handles, which typically use 1.5kV screen potentials, shunt regulators are neither; /archives//html/Amps/1998-11/msg00212.html (10,634 bytes)
6. [AMPS] Screen regulator circuit needed (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 15 Nov 1998 22:39:00 +0000; Note that the necessary breakdown voltage foir a shunt stabilizer device is not the output voltage, but the INPUT voltage, to handle transient situations where the device is completely cut off and th; /archives//html/Amps/1998-11/msg00213.html (12,016 bytes)
7. [AMPS] Screen regulator circuit needed (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Mon, 16 Nov 1998 07:40:03 +0000; snip Only if they have the same, or fairly similar gate threshold voltages - not a problem with same types having same date codes but beware of mixing date codes or type numbers without measuring fir; /archives//html/Amps/1998-11/msg00216.html (9,336 bytes)
8. [AMPS] Screen regulator circuit needed (score: 1): Author: measures@vc.net (Rich Measures); Date: Mon, 16 Nov 1998 00:17:37 -0800; tetrodes voltage which using an oddity, but they can still be made to work, but transistors are a better choice. Indeed. I disagree. It seems to me that there can never be more potential across a sh; /archives//html/Amps/1998-11/msg00217.html (13,134 bytes)
9. [AMPS] Screen regulator circuit needed (score: 1): Author: measures@vc.net (Rich Measures); Date: Mon, 16 Nov 1998 00:42:19 -0800; This is why I use an equalizing resistor in the series-pass reg. circuit on my Web site. FETs should not be paralleled without equalizing resistors. - later, Steve Rich... R. L. Measures, 805-386-37; /archives//html/Amps/1998-11/msg00218.html (10,502 bytes)
10. [AMPS] Screen regulator circuit needed (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 16 Nov 1998 13:52:03 +0000; Don't forget the transient conditions - like, how do you switch it on? Before the feedback loop stabilizes, the shunt device is drawing zero cirrent and is exposed to the full unregulated voltage (al; /archives//html/Amps/1998-11/msg00229.html (13,489 bytes)
11. [AMPS] Screen regulator circuit needed (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Mon, 16 Nov 1998 21:40:50 +0000; Agreed. Steve -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Search: ht; /archives//html/Amps/1998-11/msg00231.html (9,990 bytes)
12. [AMPS] Screen regulator circuit needed (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Mon, 16 Nov 1998 21:39:22 +0000; If the applied voltage exceeds the device breakdown voltage, it isn't necessarily terminal if the current is limited. I guess that low frequency power bipolars are probably dc tested in a similar fas; /archives//html/Amps/1998-11/msg00232.html (11,480 bytes)
13. [AMPS] Screen regulator circuit needed (score: 1): Author: measures@vc.net (Rich Measures); Date: Tue, 17 Nov 1998 05:53:22 -0800; Piece of cake. One causes the shunt transistor to temporarily switch On as the input potential is ramping up. Or, for a pass transistor, one puts a R-C delay ahead of the Source, or Collector. [Figu; /archives//html/Amps/1998-11/msg00234.html (14,895 bytes)
14. [AMPS] Screen regulator circuit needed (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Tue, 17 Nov 1998 10:18:00 -0500; SNIP Ian, what would be the impedence of a vacuum tube series regulator? And what effect if any would it have at a Es of 1KV or more? While a 4CX250 would require a regulation of 1 volt or less for I; /archives//html/Amps/1998-11/msg00236.html (10,625 bytes)
15. [AMPS] Screen regulator circuit needed (score: 1): Author: measures@vc.net (Rich Measures); Date: Tue, 17 Nov 1998 08:33:11 -0800; Carl, km1H: The minimum Z of the pass (tube) regulator element becomes a factor only at maximal screen currents. However, if enough raw input potential is available, and the comparator/reference/dri; /archives//html/Amps/1998-11/msg00240.html (9,840 bytes)
16. [AMPS] Screen regulator circuit needed (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 17 Nov 1998 15:00:25 +0000; Sorry, I'm not making myself clear. I *did* assume that there is a screen bleeder resistor. My point was that it does not necessarily prevent this scenario, unless the value has been carefully select; /archives//html/Amps/1998-11/msg00244.html (12,461 bytes)
17. [AMPS] Screen regulator circuit needed (score: 1): Author: measures@vc.net (Rich Measures); Date: Tue, 17 Nov 1998 11:42:48 -0800; If one assumes that the amp "designer" did Not follow the tube manufacturer's recommendation, all bets are assuredly off. ok, which includes the sampling circuit current for the comparator. ok ok Th; /archives//html/Amps/1998-11/msg00245.html (13,368 bytes)
18. [AMPS] Screen regulator circuit needed (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 17 Nov 1998 22:55:38 +0000; If it's in some kind of feedback circuit the impedance could be very low. The same is true of a shunt regulator, eg something using an 807 or a similar smallish transmitting tube, if you use somethin; /archives//html/Amps/1998-11/msg00246.html (11,442 bytes)
19. [AMPS] Screen regulator circuit needed (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 17 Nov 1998 22:20:17 +0000; [snip - agreed, or near enough] Yes, again we agree. But also unfortunately an inadequate regulator, from the viewpoint of obtaining the best possible IMD and protection for the tube (as demonstrated; /archives//html/Amps/1998-11/msg00247.html (11,006 bytes)
20. [AMPS] Screen regulator circuit needed (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Tue, 17 Nov 1998 21:38:23 +0000; Without question - I'm not necessarily advocating it, although I will get round to trying it one day... Or add a trip that detects the screen voltage wandering high (or zero current in the regulated; /archives//html/Amps/1998-11/msg00249.html (10,544 bytes)

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