开云体育

Hello to the new group. I purchased a Henry 3K Ultra from a friend. Little did either of us know, but a mouse decided to build a nest on top of the tube's cooler. Apparently he liked smoke blown up his fanny. No, there is no carcass, but the cooler is disgusting and about 5% of the fins are obstructed. Any thoughts for removing the... debris from this dude? Thanks, John, N9RF

I was booted off of AMPS by W8JI, Charles Thomas Rauch, Jr. Thus, I can no longer post there. Would someone who can still post there please post that an uncensored alternative to AMPS now exists at: http://groups.yahoo.com/group/ham_amplifiers Tnx R L MEASURES, AG6K. 805-386-3734 r@...

It does not appear that the amps reflector will allow mentioning of this group. We must spread the word by direct E-Mails to our friends. In the amps archives, there is only one message posted today, and only two posts made it through yesterday. (((73))) Phil Clements, K5PC

I re-read today the data given in the ARRL '97 handbook. The working condition as stated in the handbook does not mention the values are for two tubes; AB2 class amplifier with VA=4000V, VG2=500V, VG1=-60V and IP=300...1200 mA; output power of 3000 Watts. I guessed the idle current was high (exceeding actual plate dissipation) but reading the Eimac data sheet it states those same values but for two tubes, also tube's IP max=700 mA. A typo in the handbook. Best regards Guillermo - LU8EYW.

Apparently the discusion got squashed on the other reflector. SO, who is Jack Gerritsen? 73, Mike, W5UC

Other yahoo amplifier groups http://groups.yahoo.com/group/Tube_Amps/ http://groups.yahoo.com/group/rfamplifiers/ http://groups.yahoo.com/group/11meteramps/

A month or so ago, my cousin visited me with an unusual gift. He discovered an old machine being scrapped and rescued for me (knowing my hobby) two Eimac 4PR-1000 tubes, with the chassis mount (blower fan included), two sockets, clamps and chimneys. You may figure my surprise when I saw him at my house's door with such bottles in his hands. The tubes where rescued from a medical equipment, so I don't know the performance, although they look visually good indeed. I read somewhere these are improved versions of the 4-1000 types, is this ok?. There is a chart for AB2 grounded cathode work in the ARRL handbook ('97) which states 3000V plate voltage, and an idle current of 300mA. This while idle means you are nearly maximum rated plate dissipation, is ok?. Best regards Guillermo - LU8EYW.

I am very happy we have found a new unmoderated home. Recent posts on the old group have been boaring to say the least. Welcome to all and lets continue to have free and meaningful discussions on this great topic! John Coupe WA3BXH

I purchased one unit from Costco. The price was $99. The unit was surprisingly light in weight compared to my old transformer-powered 400W u-wave oven. I found no RFI problem from 50 - 550 MHz. The rating is 1300w, which is most probably the DC input power to the magnetron. At 120V, c. 17A of current is drawn. If a SSB amateur radio amplifier was built using the Matsushita switcher PS, two units are probably needed. By putting the 120V inputs to the two switcher supplies in series, operation from a standard, 240VCT, 20A outlet would work. I have not yet disassembled the oven to measure the HV. Does anyone know what's the typical range of potentials used to power magnetrons of this size? tnx R L MEASURES, AG6K. 805-386-3734 r@...

Thanks to W3SLK for the info, it finaly made the old amps-list. I was sorry to see what happened over at the old list, personally I hate censorship no matter what it is. For years I have been wounder who the moderator was at the amps-list, I know now, guess I should have figured it out. 73 Jim SM2EKM

This has some redeeming value, but on another bulletin board, the topic of using nichrome wire came up being used as a meter shunt. someone chimed in that you can't solder to nichrome wire. Another stated that you had to add enough solder to the joint to make it mechanically stable. I was under the impression that you had to use allot of heat, (like one of those large soldering irons you see in the bargain boxes below the flea market tables), due to the heat wicking properties of the wire. Am I correct in that assumption or only half correct? Mod-U-Lator, Mike(y) W3SLK

Earlier today someone mentioned the top band reflector. I love 160 and can't wait until the bands get quiet enough for it to be productive. However I have a lot to learn about building some kinda receiving antenna that will improve my reception. How do I find it? 73, Mike, W5UC http://members.cox.net/w5uc/

It is information like this that maintains my interest in amateur radio. de Paul, W8AEF

The mesage got through anyway. VK6APK posted a respomse with the announcement at the bottom and the censor missed it. 73, Mike, W5UC

Hal, The softstarter in the Emtron amps is a phase control triac system, not a zero crosser. It allows gradually more of the primary AC sinewave into the powersupply. By doing so there is no need for a series resistor to limit the inrush current. Although the series resistor current limiter is effective I consider the phase control system more gracious. I have put a quicktime movieclip on http://ph.groups.yahoo.com/group/ham_amplifiers showing the softstarter power up a lightbulb. Cheers, Dick PA3DUV

Thanks to Mike, and at his expense, I am posting this correction: The antenna reflector address should be http://groups.google.com/group/rec.radio.shortwave?lnk=gschg&hl=en John, N9RF

Enter your vote today! A new poll has been created for the ham_amplifiers group: what is the output power capability of your HF power amplifier. (obviously we never exeed our legal limit) o < 2 kW o 3 kW o 6 kW o 12 kW o > 15 kW To vote, please visit the following web page: http://groups.yahoo.com/group/ham_amplifiers/surveys?id=12426176 Note: Please do not reply to this message. Poll votes are not collected via email. To vote, you must go to the Yahoo! Groups web site listed above. Thanks!

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the ham_amplifiers group. File : /DSCN6549.MOV Uploaded by : pa3duv <pa3duv@...> Description : Emtron phase controlled sofstarter test You can access this file at the URL: http://groups.yahoo.com/group/ham_amplifiers/files/DSCN6549.MOV To learn more about file sharing for your group, please visit: http://help.yahoo.com/help/us/groups/files Regards, pa3duv <pa3duv@...>

There is something really wrong when the name of the moderator must be kept a secret. Looking forward to enjoying the new group. 73. Mike, W5UC