Mail Archive Search: <+from:paul@paulbaldock.com>

Results:

References: [ +from:paul@paulbaldock.com: 116 ]

Total 116 documents matching your query.

81. Re: [Amps] Why a voltage doubler ? (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Sat, 13 May 2017 16:32:23 -0700; Doesn't a full wave bridge give you better regulation as all capacitors are charged on both halves of the AC waveform, where as with a voltage doubler the capacitors are only charged on half the wave; /archives//html/Amps/2017-05/msg00133.html (11,117 bytes)
82. [Amps] Ferrite Core for 160M PI Output ? (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Sat, 10 Jun 2017 11:05:50 -0700; What's the best PI Output Ferrite Core(s) to use for a 1.5KW tube amp? Thanks - Paul KW7Y _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting; /archives//html/Amps/2017-06/msg00139.html (9,159 bytes)
83. [Amps] Ferrite Core for 160M PI Output ? (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Sat, 10 Jun 2017 14:09:05 -0700; When I said Ferrite I should really have said Toroidal so as to include Iron Powder. - Paul What's the best PI Output Ferrite Core(s) to use for a 1.5KW tube amp? Thanks - Paul KW7Y _________________; /archives//html/Amps/2017-06/msg00140.html (6,454 bytes)
84. Re: [Amps] Ferrite Core for 160M PI Output ? (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Sat, 10 Jun 2017 22:45:11 -0700; Thanks for the info Jim. I'm working on converting and SB220 to a dual 6M, 160M amp. I've done lots of single band 6M conversions, so this will be interesting. - Paul At 09:20 PM 6/10/2017, Jim Thoms; /archives//html/Amps/2017-06/msg00146.html (9,269 bytes)
85. Re: [Amps] Ferrite Core for 160M PI Output ? (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Mon, 12 Jun 2017 12:01:46 -0700; Why is it necessary to wrap the individual toroids before stacking? How about Kapton Tape instead of Scotch 27? - Paul KW7Y Dont forget to wrap each one with a layer of Scotch 27 HV tape and then wra; /archives//html/Amps/2017-06/msg00188.html (8,701 bytes)
86. Re: [Amps] Ferrite Core for 160M PI Output ? (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Mon, 12 Jun 2017 15:44:33 -0700; I understand insulating between the wire and the core, but why do you need to insulate the two cores from each other? Dont forget to wrap each one with a layer of Scotch 27 HV tape and then wrap the; /archives//html/Amps/2017-06/msg00191.html (9,453 bytes)
87. [Amps] SB221 80m-10m for sale (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Sun, 23 Jul 2017 11:27:46 -0700; For Sale $650 plus shipping (add 3% for PatPal) Excellent Condition Wired for 240V Measured Output: 3.80MHz ? 1300W PEP 7.20MHz ? 1200W PEP 14.2MHz ? 1100W PEP 21.3MHz ? 1000W PEP 28.4MHz ? 900W PEP; /archives//html/Amps/2017-07/msg00088.html (7,449 bytes)
88. Re: [Amps] Machlett 3-500z (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Sun, 23 Jul 2017 12:29:50 -0700; Have you tried here. https://www.alpharfsystems.com/?page_id=1519&model_number=TS-001 Unfortunately twice the price they were couple of years ago when I bought 2 sets. That's when they when "RF Conce; /archives//html/Amps/2017-07/msg00092.html (11,511 bytes)
89. Re: [Amps] Machlett 3-500z (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Mon, 24 Jul 2017 07:22:36 -0700; RF Concepts used to be the Ten Tec/Alpha company, and tube prices were great. Now its Alpha RF Systems and very expensive tubes. - Paul <https://yho.com/footer0>Sent from Yahoo Mail for iPad Unfortun; /archives//html/Amps/2017-07/msg00094.html (13,728 bytes)
90. [Amps] Bird Slug Modification? (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Wed, 25 Oct 2017 13:37:59 -0700; I have a 5W 50-125MHz slug. Can I turn it into a 1KW slug by adding a suitable series resistor? Thanks - Paul KW7Y _______________________________________________ Amps mailing list Amps@contesting.co; /archives//html/Amps/2017-10/msg00163.html (6,760 bytes)
91. Re: [Amps] Bird Slug Modification? (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Wed, 25 Oct 2017 17:49:47 -0700; After receiving some good tips about the coupling of a 5W slug being too tight to convert to a 1KW slug with just a resistor change, I've decided to move the pickup further from the transmission line; /archives//html/Amps/2017-10/msg00168.html (8,704 bytes)
92. Re: [Amps] Using 813 tubes on 17 meters and above... (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Sat, 02 Dec 2017 08:53:23 -0800; My 2 x 813 Amp, works all the way to 29MHz. Outputs 800W PEP with about 2300V on the plates. Grid driven with a DX-60. I also have an 2x813 modulated by 2x813 on 21MHz. Full legal limit 375W carrier; /archives//html/Amps/2017-12/msg00005.html (7,289 bytes)
93. Re: [Amps] Here's a new one for me that I'd like to share (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Tue, 05 Dec 2017 12:45:49 -0800; It seems counter intuitive, bit what Jim say's is true, block the blower and it does not have to move the air so is doing "less work". You can demonstrate this by monitoring the current on the vacuum; /archives//html/Amps/2017-12/msg00033.html (11,294 bytes)
94. Re: [Amps] Negative feedback passive input tetrode (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Thu, 14 Dec 2017 10:30:53 -0800; Acom put a resistor (12 Ohms ?) in the cathode. This also helps keep the gain down to 15dB for FCC. - Paul Has anyone see or used negative feedback to better obtain lower IMD in a passive (resistor t; /archives//html/Amps/2017-12/msg00102.html (7,820 bytes)
95. Re: [Amps] NXP 65V LDMOS 1K80H-1800W (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Sat, 23 Dec 2017 10:14:50 -0800; Next Tuesday I will receive the first in the USA SPE 1.5K-FA. This uses a single device unlike the Flex or Elecraft. Some publications say the SPE uses the MRF1K50HR5 and others the MRF1K80HR5, so I'; /archives//html/Amps/2017-12/msg00123.html (10,613 bytes)
96. Re: [Amps] NXP 65V LDMOS 1K80H-1800W (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Sun, 24 Dec 2017 09:49:51 -0800; SPE say 1.5KW SSB and CW, no limit. Continuous duty modes, should be used on the lower 1KW or 500W ranges. This will by my 6M amp / instant on HF / backup HF amp. I plan to limit it 1KW. From the man; /archives//html/Amps/2017-12/msg00140.html (11,715 bytes)
97. Re: [Amps] NXP 65V LDMOS 1K80H-1800W (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Sun, 24 Dec 2017 15:23:28 -0800; It's a pity no one makes an auto tune 2 x 3-500Z with 6M. - Paul say about duty cycle. $7K price tag. REPLY: Before anyone gets too enraptured over SS amps, you might want to reconsider the advantage; /archives//html/Amps/2017-12/msg00144.html (9,355 bytes)
98. [Amps] GS35B Idle current increasing (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Thu, 08 Mar 2018 09:09:00 -0800; I built a GS35B amp a few years back to be used with my home brew AM rigs. Initially I set the idle current at around 110mA/4KV requiring about -35V bias. Over a few years of very little use the idle; /archives//html/Amps/2018-03/msg00029.html (7,200 bytes)
99. Re: [Amps] GS35B Idle current increasing (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Sat, 10 Mar 2018 16:13:37 -0800; Normal power output, but as you would expect I need a little more drive as the bias voltage is increased. Drive power is 10-12W of carrier with around 120% upward modulation, so that's about 50W PEP; /archives//html/Amps/2018-03/msg00033.html (9,468 bytes)
100. Re: [Amps] GS35B Idle current increasing (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Sat, 17 Mar 2018 14:45:45 -0700; Today I measured the filament voltage which is 13.5V. Spec is 11.9 to 13.3, so I think this OK. Jim - They have the appearance of unused NOS, still in the original packaging. - Paul <I built a GS35B; /archives//html/Amps/2018-03/msg00051.html (9,509 bytes)

Current List: 81 - 100
Page: [1] [2] [3] [4] [5] [6]