--- In ham_amplifiers@..., Jan Erik Holm <sm2ekm@...>
wrote:

This AMPS list admin sure is getting paranoid,
needs to see a shrink maybe.

73 Jim SM2EKM

### agreed.... or he could just get... "free" advice here. I'm
suggesting 500 mg of Prozac 3 x times a day... + a shot of
whiskey.... stay away from computer's, "the internet".... and
perhaps he could perform self electro shock therapy... with
just a variac and HV supply.....EG: He could hi-pot test
himself..... to say 60 ma. After all that... he then needs
to get a life.

73 Jim VE7RF

I told you morons to stop this thread. Nothing techinical here.

Am I going to have to throw you all out of here. The list founder
told me to clean up this mess and I will.

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It was, in fact I used a variable frequency generator to see what the optimum fqcy. could be, but had no great success. Again, I have yet to experiment a bit more.

Best regards
Guillermo - LU8EYW.

Hsu escribi:

On Oct 4, 2006, at 8:07 PM, Tony King - W4ZT wrote:

Looks like it never made it to their archives.

It seems that ham_amps is becoming the Administrator Bypass Bulletin Board for AMPS

Tony W4ZT

Phil Clements wrote:

A post on the AMPS reflector that got by the censor today was from
Bob, W6TR; the thread was about the copying of the AL-811 amp in China.

"Isn't it time to bring the curtain down on this thread? Copying an
Ameritron amplifier is like trying to perform a hemorrhoid transplant."

Bob W6TR

This made my day!

(((73)))
Phil, K5PC

Yahoo! Groups Links

R L Measures, AG6K, 805.386.3734
r@..., , rlm@..., www.somis.org

Maybe its for a friend, hmmm....maybe "the administrator"?

73 Jim SM2EKM / Sri I couldnt resist
----------------------------------------------------------------

pentalab wrote:

Hi Dick,

PA3DUV wrote:

Sasha,

That's a joke! Most houses in the Lowlands are pre wired for 3 phase mains.

That's exactly what I've said on the phone to the lady in Eneco - it must be a joke!
They've said that I have to fill-in some request form where I should explain and
justify the need for the 3-phase for the house in the residential area and only
after they approve it I can make payment (little bit over 1000) and wait for
couple of months before they do it.
Needles to say, I considered this to be very poor service so I turned them down.
Anyway, as my house is very close to the downtown Rotterdam and I can't put up
antennae system for any serious work, I'll do my contesting from YT0A (YU1EXY)
contest location where there are no issues like this - including access to the 3-phase
and some serious aluminum in the air...
Just to stay on amplifiers topic, anyone knows source for the EBM PAPST blowers ?
I am looking for couple of G2E140 (or their equivalent - Air Control, or something similar)
for the decent price. I've found new ones for ~ 200 a piece, which is quite expensive.
It will be used for a single GU84B - one for HF and and another one for VHF.

Cheers,
Sasha YZ6X/PA

I build my house in the mid 90's and the service panel has 4 wires + ground coming in. They only need to add 2 fuses and change out the meter. The utility is Essent and they charged me 175 Euros to do it. I had to rewire everything after the meter myself and add a three phase breaker and diff switch. That was an easy job though and did not cost me near Euro 1000.- ;-))

Cheers, Dick
PA3DUV

This AMPS list admin sure is getting paranoid,
needs to see a shrink maybe.

73 Jim SM2EKM

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Looks like it never made it to their archives.

Tony W4ZT

Phil Clements wrote:

The blood pressure is rising ;-)

Cheers, Dick
PA3DUV

开云体育

A post on the AMPS reflector that got by the censor today was from
Bob, W6TR; the thread was about the copying of the AL-811 amp in China.

"Isn't it time to bring the curtain down on this thread? Copying an
Ameritron amplifier is like trying to perform a hemorrhoid transplant."

Bob W6TR

This made my day!

(((73)))
Phil, K5PC

That is a joke, he wan t to whip away on me, but he scram first !
73!Hsu

Hi,Guillermo,
I think your square wave generator's freqence is too high?the
ignition automotive coils's is iron not ferrite, the frequence
must below kilo hertz
73! Hsu


u may be in the good direction; I did not tried with TV flyback
transformers, but did once some experiments with old ignition automotive
coils, excited with a square wave generator and a darlington transistor
amplifier. I could never get more than 400 volts pk-pk. With 13.8V supply.
The circuit was not optimized also due to lack of time for another tasks, but
I think one could get better results.
More experimentation is in order here.

Best regards
Guillermo - LU8EYW.

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Hsu, you may be in the good direction; I did not tried with TV flyback transformers, but did once some experiments with old ignition automotive coils, excited with a square wave generator and a darlington transistor amplifier. I could never get more than 400 volts pk-pk. With 13.8V supply.
The circuit was not optimized also due to lack of time for another tasks, but I think one could get better results.
More experimentation is in order here.

Best regards
Guillermo - LU8EYW.

Hsu escribi:

开云体育

--- In ham_amplifiers@..., jmltinc@... wrote:

I don't know a model 85 from a Model T, or a model 88 from a

Rocket 88

(remember those?). I can't hi-pot a switch online.

How can I select a candidate online, in a catalog, or at a hamfest

if no no

specifications are known or the switch has no identifying marks?

Thanks again,

### pretty tough. You can see and download ALL the detailed specs
of Multi tech switches at.....
industries.com/Default.htm

### Centralab JVC series switches are used in alpha.. and a lot
of other amps.

### You can look at contact surface area.. and also space
between contacts... contacts to rotor etc. Figure on 9 kv
per 1/4" 4.5 kv per 1/8" etc.

### B4 u get too carried away.. you have to figure whether u
want a PI- PI-L... how many KW.... how many bands, shorting or
non shorting switch... how many KV on anode of the tube etc.

### for 8877.... 3-500Z's.... etc.... a model #86 will work
fine. For 4-1000's... YC-156's 3000/6000 A7 triodes... and
also big tetrodes.... 1-3 wafers of the model 88/85 will work.

### for mono band amps.... u don't require a bandswitch of
course.....ditto with heavy duty roller inductor's.

### My buddy had a 1969 Delta 88 oldsmobile..... stupidest
thing he ever did getting rid of it..... 455 cu in V-8...
globs of torque !

Jim VE7RF

On Oct 4, 2006, at 3:25 PM, craxd wrote:

--- In ham_amplifiers@..., R L Measures <r@...> wrote:

From: R L Measures <r@...>
Date: October 4, 2006 11:52:44 AM PDT
To: ham_amplifiers@...
Subject: Re: [ham_amplifiers] Re: Hi-

Will -- My mistake, it was on p.71 of the September, 1994 issue of
QST magazine where Tom writes: "Although VHF and UHF parasitics are
undesireable effects. and must be avoided, there is no basis in
amplifier tube theory or actual experience to support such
conclusions. They are not supported by design theory or the
experience of recognized amplifier experts in the RF amplifier design
community that include Eimac, Siemens, ETO, Henry, and Ameritron."
Since ETO is Dick and Ameritron is Tom, Dick and Tom are "recognized
amplifier experts", and this according to a guy who says that Ni-Cr
alloys have reverse skin effect and that the conventions of AC
circuit analysis do not apply to R/L VHF parasitic
suppressors. . . . George Grammar, W1DF, QST Technical Editor
during the 1950s. was probably turning over in his grave.
Background: Around September of 1993, I received a letter from
QST Technical Topics Column Editor Paul Pagel asking me to write
another article for QST about amplifiers. The result was "The Nearly
Perfect Amplifier", which appeared in the January, 1994 issue of the
magazine. The article outlined things which a perfect or nearly
amplifier would have. Examples were step-start to limit inrush- I, T/R, R/T switching that was Faster than that of transceivers in order
to prevent hotswitching, filament-potential adjusting potentiometer
to maximize emissive life, lower-Q VHF parasitic oscillation
suppressors to improve stability, the use of a grid fusing element,a
glitch resistor in the HV+ lead to limit peak-I during an anomaly,
and potting the HV transformer to reduce hygroscopic absorbption and
improve heat transfer. The article apparently lit the fuse of Tom
Rauch, W8JI, (MFJ-Ameritron) and the even shorter fuse of Dick
Ehrhorn W0ID (!) (ETO/Alpha), whereupon they apparently began
kvetching to the magazine that they should be allowed to write a
rebuttal that would be published in Technical Topics. Quite probably
since MFJ and ETO were major advertisers in QST, this got QST's
attention and QST agreed to publish the rebuttal.
As I see it, publishing the rebuttal was the only fair thing to
do. However, to be fair, my reply to the abundance of questionable
statements made therein also needed to be aired. The problem was
that QST Editor Mark Wilson. AA2Z, refused. As a result, I launched
my Web site and published my reply to the rebuttal

so that QST subscribers could see what the QST Editor did not want
them to see.

Since you okay it : )

I relish such things.

Quote;

"The thing that gets Rich Measures in trouble is that his
writings HAVE been peer reviewed and been denounced as snake
oil by academics,

Tom Rauch an academician? -- he's never taken a class in the very
basis of RF amplifier design -- alternating current circuit analysis.

I didn't figure he did by some of the stuff he has said. One can
tell if someone has actually been taught something, or just trying
to quote things they've heard or read from unreliable sources.
I highly doubt he's ever did any actual research either. I know
what that's like as I'm still doing it on transformers and power
supplies. I've been doing it now for about two years straight.
I'm still finding out new things that I hadn't seen in other works.

responsible engineers from every major tube
builder,

The only person from a tube mfg that he got to go along with his
dicta was his buddy Reid Brandon, the Eimac Customer Relations guy -

It would about have to be as i've read the photocopy of your
letter from Eimac.

who told QST's Paul Pagel that Eimac's Chief Specifications Engineer,
Willis B. Foote was not authorized to tell me that gold-sputtering
from the grid was thought to be caused by a UHF oscillation

condition.




That would be a salesmans tone so as not to make ones think the
tubes were faulty.

The problem is not that the tubes are faulty, it's that some designers of amplifiers ignorantly chose to ignore C-feedback.

RF design engineers from many companies ranging from
amateur manufacturers to MRI/ISM amplifier builders and
several major broadcast transmitter manufacturers.

Guffaw. The clue word here is "many" because he fails to list the
companies.

Measures'
material has all the earmarks of a "good con" ... just enough
truth to give it a patina of believability to the untrained
and impressionable".

Thanks, Will.

No problem!

This all over Tom trying to argue that a control grid could
become positive.

It can and definitely does so in a grounded-grid amplifier during
most of the negative half of the driving cycle.

No, If you remember, I did say that that was the only case.
What he was getting at was it could become positive with the
grid disconnected from ground, and if I remember, there was
another way which we both collared him on.

With air in the tube, the grid can go positive provided that the
anode is sufficiently positive to make the O^2 and N^2 atoms ionize

Positive with respect to the cathode you mean? Terman calls
it less negative, see below.

Less negative is not necessarily positive.

...

...

A participant in a discussion can not be the censor of the
discussion
because it would stink even more than fresh feces. .

Yes, it has stunk since someone re-appeared on Amps after several
years of absence.

...
But he can't control us bailouts.

According to this nameless admin, he booted all of us out.

chortleicious

...

R L Measures, AG6K, 805.386.3734
r@..., , rlm@..., www.somis.org

开云体育

Hsu,

Most of the smaller commercial ones at around 4-5 kV use a neon
sign transformer. Those are not that heavy, nor big either. It's
according to what you have available there, but any sign company
can get you a used transformer cheap. You may have to use a doubler
or tripler, it's according to the output voltage of the transformer.
These are pretty low current, maybe 5 mA or so. It doesn't take
much.

Best,

Will


--- In ham_amplifiers@..., "Hsu" <Jbenson@...> wrote:

I want to build an Hi-pot tester, I have seen some design, Rich's

and W6CW,But I do not want use ac transformer.

it is two heavy and need AC main power.I have some junk B/W and

Clour TV FBT, I think if I can be use in this project.

I have a quertion, How much current the hi-pot tester should

supply?The another function of tester is burning of the "junk" between
two electrode,it needs more current.

73! Hsu