This may be my first and last post on this list, but I wanted to clear
a few misconceptions:

Tom Rausch is not the Admin of Amps. I'm not either ;^)

W4AN was not a fan of free speech - he replaced me as Admin of
Towertalk when I refused to censor posts there; this is not a knock on
Bill, just a difference of philosophy.

I run a local community affairs mailing list with only two rules - sign
your real name and maintain basic civility - keep it substantive, not
personal. In 6 years, I've had to ban one person for a week. A
parallel list has no such rules, and has disintegrated into ugly name-
calling.

From what I have read, such a regime on amps would have worked pretty
well, though the Admin would have had to ban a few people.

73, Pete Smith N4ZR

Jan Erik Holm escribi:

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.

I sent a message there announcing the creation of this new list and it was censored, so I guess if "you know who" erased it to prevent AMPS "instability".
Things became personal matters.

Best regards
Guillermo - LU8EYW.

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

Agreed 100%.

Best regards
Guillermo - LU8EYW.

w5uc escribi:

It didnt, atleast I read answers. Please, instead use
Google and lets keep it to amplifiers and related things
on this list.

73 Jim SM2EKM
---------------------

w5uc wrote:

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

73,
Mike, W5UC

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

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

73,
Mike, W5UC

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

Mike,

No, the melting temperature raises when you use silver in a solder.
The more silver, the higher the melting temperature. Some has to be
used at red hot brazing temperatures. Thus in order for it to flow and
bond, it has to be at the correct temperature to do it.

Best,

Will

--- In ham_amplifiers@..., "Mike Sawyer" <w3slk@...>
wrote:

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

Mike,

No, the melting temperature raises when you use silver in a solder.
The more silver, the higher the melting temperature. Some has to be
used at red hot brazing temperatures. Thus in order for it to flow and
bond, it has to be at the correct temperature to do it.

Best,

Will

--- In ham_amplifiers@..., "Mike Sawyer" <w3slk@...>
wrote:

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

I found the following web page:


home.htm

de Paul, W8AEF

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@...

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.

开云体育

Mikw -- Ni-Cr alloys can be soldered with 95%-Tin, 5%-silver
(plumbing) solder. The melting point is c. 221?C. J. W. Harris Sta-
Brite flux - which is made for soldering stainless steel alloys -
works well for soldering Ni-Cr. Before soldering, clean the oxides
off of the Ni-Cr with coarse steel wool or carbide paper. Apply drop
of silver solder to tip of iron, touch drop to the joint to be
soldered, remove iron, apply drop of flux. The flux will sizzle -
which activates the flux. Re-apply soldering iron and the joint
should suck in the drop of silver-solder. The flux residue should be
removed with running warm water and a toothbrush. If the iron is
temperature controlled, 600?F seems to work well since higher temperatures break down the flux into useless brown goo.


On Sep 17, 2006, at 7:05 AM, Mike Sawyer wrote:

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

R L MEASURES, AG6K. 805-386-3734
r@...

开云体育

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@...

Guillermo: To be linear, a 4-1000 needs to be run either in Class AB1 grounded-cathode, grid-driven or Class AB2 g-g, cathode-driven. For SSB, anode supply potentials of 6kV to 7kV are common. For AB1: a screen supply of 1000V is needed to make maximum output, and Bruene bridge-neutralization is not a bad idea above 15m.
cheerz

On Sep 16, 2006, at 5:04 AM, GGLL wrote:

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.



Yahoo! Groups Links

R L MEASURES, AG6K. 805-386-3734
r@...

开云体育

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.

On Sep 14, 2006, at 7:42 PM, KR4DA wrote:

It's a real shame that the AMPS@... turned into what it did.
I quit amps@ about 2 months ago because of the nazi style control and censuring.
I refuse to belong to any GROUP that censures.

Since 1997, I have opposed censorship on AMPS, I got booted out 4- times and I was reinstated 3-times- thanks to pressure on the censor from AMPS members. My main weapon was direct-mailing to members around the censor when I got censored or booted.
As I see it, the freedom of the Internet can topple any megalomaniac that comes along, no matter if he appoints one of his faithful lap-dogs as the censor, or, as recently happened. he appoints himself as the censor.

If you haven't used YAHOO before there are abilities to POST to
a FILES section and a PICTURES section.
So if you have any files or pictures LOG in to YAHOO
at www.yahoo.com and get a different look at the GROUP
and the things you can do.

I personally am not a GURU but enjoy reading questions
and answers about amps. They are black magic to me.

historical note -- Up until I completed the "Plywood Box" x100 amplifier, I used to feel pretty much the same way, but then the lights came on, and I realized that it was a machine of smaller, understandable, machines, and the whole thing made sense. I was 42 when the lights came on, some 27 years after building my first amplifier. Now I'm 65 and I feel fortunate to be alive.

k5pcphil wrote:

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

-- Bob Vmoa chat list -> vmoachat/ Vmoa tech list home -> group/vmoatech/ Middleburg Fl (South Jacksonville) ICQ 13912841 Web Page Visit the FDXPG at www.geocities.com/w4wx1/ Ham Radio Calls: KR4DA FG/KR4DA J79DA HK0/ KR4DA Motorcycles CBMMA #4 1977 XS750D 1J7008405 1997 Vmax12J VMOA #504

R L MEASURES, AG6K. 805-386-3734
r@...