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1. [Amps] Re: 8877 dissp (score: 1)
Author: wa1hco@adelphia.net (jeff millar)
Date: Wed, 13 Nov 2002 20:33:35 -0500
Plate dissapation is a power limit for the piece of metal making up the plate...Put DC on the Tube (no RF), make it heat up and measure the power versus temp curves and decide what the limit should b
/archives//html/Amps/2002-11/msg00218.html (12,255 bytes)

2. [Amps] Russian Vacuum Variables (score: 1)
Author: wa1hco@adelphia.net (jeff millar)
Date: Mon, 25 Nov 2002 09:05:53 -0500
Pavel's an ok dealer. But, the whole banking system in Russia and money transfer mechanism is costly and difficult. Suggest buying two at once and combining the money transfer costs.
/archives//html/Amps/2002-11/msg00364.html (7,740 bytes)

3. [Amps] Transformer help (score: 1)
Author: wa1hco@adelphia.net (jeff millar)
Date: Sat, 30 Nov 2002 12:37:57 -0500
If you're lucky it just the HV rectifier diodes. Disconnect them from the transformer and see if it still blows. Another possibility...the electrolytics either are shorted or need reforming. If pulli
/archives//html/Amps/2002-11/msg00416.html (8,591 bytes)

4. [Amps] hv. caps. (score: 1)
Author: wa1hco@adelphia.net (jeff millar)
Date: Wed, 7 Aug 2002 20:12:11 -0400
Ebay is loaded with this stuff Sprague 3400 pF, 6 KV http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=1755932446 Russian 4700 pF, 16 KV http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=1755654768
/archives//html/Amps/2002-08/msg00089.html (7,758 bytes)

5. [Amps] BIG Audio Amp. OT. (score: 1)
Author: wa1hco@adelphia.net (jeff millar)
Date: Sat, 20 Jul 2002 18:03:49 -0400
I think the smaller cones stiffen the of the overall speaker cone to ensure the whole cone moves as one when fed with high power because it has to move close to an inch at 100 Hz. contact)
/archives//html/Amps/2002-07/msg00367.html (8,645 bytes)

6. [Amps] Low-noise high-voltage power supplies. (score: 1)
Author: wa1hco@adelphia.net (jeff millar)
Date: Thu, 6 Jun 2002 22:39:18 -0400
Here's link for a shunt regulator approach to active noise cancelation applied to low voltage power supplies. http://www.wenzel.com/documents/finesse.html Fundamentally there's no lower limit to the
/archives//html/Amps/2002-06/msg00050.html (6,905 bytes)

7. [Amps] Rectifier diode strings (score: 1)
Author: wa1hco@adelphia.net (jeff millar)
Date: Mon, 6 May 2002 22:22:30 -0400
Whoa...flux density comes from Ampere-Turns, not Volt turns. But, overall an excellent discussion. jeff, wa1hco
/archives//html/Amps/2002-05/msg00056.html (9,800 bytes)

8. [Amps] Rectifier diode strings (score: 1)
Author: wa1hco@adelphia.net (jeff millar)
Date: Tue, 7 May 2002 08:54:03 -0400
Flux density rate of change is related to Voltage V = dB/dt and V = L di/dt So dB/dt = L di/dt Integrating both sides B proportional to I you saturating apply voltage is at resistance
/archives//html/Amps/2002-05/msg00069.html (12,674 bytes)

9. [Amps] al-1500 parasitic?? or some other problem? (score: 1)
Author: wa1hco@adelphia.net (jeff millar)
Date: Wed, 15 May 2002 02:06:57 -0400
It's possible to generate a 1.5x multiplier with a nonlinear C or L. I once designed a 144 to 226 multplier with a varactor diode and some tuned circuits. The circuit contained an idler tuned circuit
/archives//html/Amps/2002-05/msg00213.html (14,293 bytes)

10. [Amps] Nonsense (score: 1)
Author: wa1hco@adelphia.net (jeff millar)
Date: Thu, 16 May 2002 21:47:12 -0400
generated sub without I noise, produces analysis tests Ahh. That's the best explanation I've heard for what causes sub-harmonics. Thank you. Now where's the nonlinearity in the solid state PA's? from
/archives//html/Amps/2002-05/msg00258.html (8,478 bytes)

11. [Amps] Non-linear subharmonics was: Nonsense, AL-1500 parasitic (score: 1)
Author: wa1hco@adelphia.net (jeff millar)
Date: Sat, 18 May 2002 08:02:24 -0400
Here's two web pages that discusses using variable capacitance to produce gain at f/2 as part of a larger discussion of varactor diodes and parametric amplifiers.. These pages specifically discusses
/archives//html/Amps/2002-05/msg00291.html (18,704 bytes)

12. [Amps] Non-linear subharmonics was: Nonsense, AL-1500 parasitic (score: 1)
Author: wa1hco@adelphia.net (jeff millar)
Date: Mon, 20 May 2002 19:19:23 -0400
The reference to gain at f/2 is there...near the top of the second reference... For proper operation, the capacitance must be decreased when the input voltage is maximum and increased when the input
/archives//html/Amps/2002-05/msg00318.html (13,301 bytes)

13. [Amps] Non-linear subharmonics was: Nonsense, AL-1500 parasitic (score: 1)
Author: wa1hco@adelphia.net (jeff millar)
Date: Tue, 21 May 2002 23:43:11 -0400
Comments embedded below... And yes, this is a very interesting topic. Of course the real problem will probably turn out completely unrelated. on his sub-harmonic re-inforcing I still think something
/archives//html/Amps/2002-05/msg00345.html (18,851 bytes)

14. [Amps] Non-linear subharmonics was: Nonsense, AL-1500 parasitic (score: 1)
Author: wa1hco@adelphia.net (jeff millar)
Date: Wed, 22 May 2002 00:21:39 -0400
You're quite correct that non-linearities do not directly generate anything other than integer harmonics 2f, 3f, etc. But it still possible to generate sub-harmonics with a non-linear reactance, a pa
/archives//html/Amps/2002-05/msg00347.html (11,505 bytes)

15. [Amps] RE: [Amps] Subharmonic (score: 1)
Author: wa1hco@adelphia.net (jeff millar)
Date: Thu, 23 May 2002 08:44:54 -0400
Netscape did nothing for me but Internet Explorer worked as Mauri described. The page uses Javascript...sometimes people turn that off for security.
/archives//html/Amps/2002-05/msg00376.html (8,092 bytes)

16. [Amps] Re: 12V 120A Switching Power supply? (score: 1)
Author: wa1hco@adelphia.net (jeff millar)
Date: Mon, 1 Apr 2002 23:51:16 -0500
Quiet? Not the FCC Class B telecom units I've been playing with. These beasts put out relatively low noise differentially between output V and its ground but put out a lot of noise "common mode" betw
/archives//html/Amps/2002-04/msg00052.html (12,773 bytes)

17. [Amps] Just testing (score: 1)
Author: wa1hco@adelphia.net (jeff millar)
Date: Tue, 2 Apr 2002 20:54:43 -0500
I told ya!
/archives//html/Amps/2002-04/msg00102.html (6,150 bytes)

18. [Amps] METER HELP (score: 1)
Author: wa1hco@adelphia.net (jeff millar)
Date: Sun, 7 Apr 2002 21:20:28 -0400
The meter almost certainly uses an external shunt...so it really isn't a 5 amp meter. If you look closely you might see "100 uA fs" or some such on the scale in fine print. Alternatively, measure its
/archives//html/Amps/2002-04/msg00229.html (7,628 bytes)

19. Re: [Amps] Metcal soldering iron and microscopes (score: 1)
Author: "jeff millar" <wa1hco@adelphia.net>
Date: Thu, 18 Sep 2003 23:51:49 -0400
Three points, I think Generate the heat very close to the tip...with very little thermal resistance between heat source and tip. Temperature regulation, power proportional to load Very little therma
/archives//html/Amps/2003-09/msg00173.html (7,954 bytes)

20. Re: [Amps] plate transformers (score: 1)
Author: "jeff millar" <wa1hco@adelphia.net>
Date: Thu, 6 Nov 2003 16:30:54 -0500
I just did that here. I put line voltage across the HV side (measured 115V) on the HV side and measured the line side output, it was about 4.25 volts. That gave me the turns ratio (about 27:1) and so
/archives//html/Amps/2003-11/msg00081.html (7,827 bytes)


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