FS: Agilent E4418B power meter
Hello All,
I have for sale an Agilent E4418B power meter.? It has a good display and comes with bumpers and handle.? It does not include the sensor or sensor cable.? It works well but I am selling as-is because I cannot guarantee calibration.? It has some scratches on the case from use.? The price is $250 plus shipping.
Tom Bryan
N3AJA
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Re: Re-capping an HP-130 Scopes
The outside foil of condensers is
usually connected to ground for shielding. If this is ignored in
the IF section of some receivers, oscillations and instability
can be a problem. In a scope or audio amplifier, the result is
likely to be hum or strange signals that come from nowhere.
??? Bruce Gentry, KA2IVY
On 10/27/21 20:31, Jim Ford wrote:
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Hmmm... could you please direct me to Mr C?? I couldn't find
him online; my google-fu must be rusty.
And, what does the foil side of a capacitor sound like??
Versus the other side?? I'd have to try that, although I don't
own a vacuum tube guitar or bass amp (not yet, anyway).
Thanks.
Jim Ford
------ Original Message ------
Sent: 10/27/2021 4:02:55 PM
Subject: Re: [HP-Agilent-Keysight-equipment] Re-capping an
HP-130 Scopes
Yep been a Mr C fan for a while.? He designed a neat little
rig that checks for foil side of a cap.? I think my second
build ever.? Works great.? I even took apart a few spare
modern caps to see if the the Mr C?SIFT works and it does.
The old 'Amp' test is one that works as well.? Plug the cap
into a guitar amp crank up the volume and you can hear the
foil side.
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Re: Re-capping an HP-130 Scopes
Hmmm... could you please direct me to Mr C?? I couldn't find him online; my google-fu must be rusty.
Mr Carlson's Lab
?
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Interesting that the letter was dated June 13th, as that is James Clerk Maxwell's and Thomas Young's (Young's modulus and the wave theory of light) birthday.? And my younger son's.
Thomas Young was an interesting guy; he was brilliant but such a poor writer that his ideas weren't appreciated until long after his death.? None of his contemporaries could figure out what he was trying to say!? I've seen a sample of his writing, and yes, it was completely impenetrable!
Jim Ford
------ Original Message ------
Sent: 10/21/2021 10:12:16 AM
Subject: Re: [HP-Agilent-Keysight-equipment] HP200CD oscillator
Here’s an excellent Google talk about Fred Terman
And an interesting letter from Bill Hewlett to Fred Terman 
George?
On Oct 20, 2021, at 4:17 PM, Richard Knoppow <dickburk@...> wrote:
? ?? There is a bio at:<>covering Bill Hewlett's education.?? Terman is an interesting character himself. His father was Lewis Terman, an early researcher into child psychology and studied child geniuses. I know just a little because I was tested and might have been included as a "Terman child" in grammar school before my family was uprooted to California. I was never a genius but I suspect Bill Hewlett was.On 10/20/2021 3:47 PM, Roy Thistle wrote:On Sun, Oct 17, 2021 at 11:27 AM, Stuart Landau wrote:
???This circuit was designed to fulfill his master's degree
???from Stanford University.
Okay... so a minor point... but I'm pretty sure Hewlett got his Masters of Science (an applied science degree) form MIT, and an Electrical Engineering degree after returning to Stanford. His supervisor at Stanford was Terman whose books are among the only books I've kept that are about the zinc plated vacuum tube era, of radio engineering.
-- Richard Knoppowdickburk@...WB6KBL
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Re: Re-capping an HP-130 Scopes
Hmmm... could you please direct me to Mr C?? I couldn't find him online; my google-fu must be rusty.
And, what does the foil side of a capacitor sound like?? Versus the other side?? I'd have to try that, although I don't own a vacuum tube guitar or bass amp (not yet, anyway).
Thanks.
Jim Ford
------ Original Message ------
Sent: 10/27/2021 4:02:55 PM
Subject: Re: [HP-Agilent-Keysight-equipment] Re-capping an HP-130 Scopes
Yep been a Mr C fan for a while.? He designed a neat little rig that checks for foil side of a cap.? I think my second build ever.? Works great.? I even took apart a few spare modern caps to see if the the Mr C?SIFT works and it does.
The old 'Amp' test is one that works as well.? Plug the cap into a guitar amp crank up the volume and you can hear the foil side.
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The older tubes are OA3, OB3, OC3, and OD3. These are also (IIRC)
VR75, VR90, VR104, and VR150.? Don't quote me on the VRxxx tubes,
because I haven't dealt with them in a good 25 years (or more).? I
just remember that the VR series crossed over in the Ox3 series,
and that the 56xx series had a lower current, was used in Tek
equipment (that I remember) and had a lower voltage.
All of these were parallel regulators ( run current through and
have constant voltage to ground).? Exactly like zeners in
operation, ignoring different characteristics.
Harvey
On 10/27/2021 8:09 PM, Bob Albert via
groups.io wrote:
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Another tube that glows
orange is VR75.
On Wednesday, October 27, 2021, 05:00:05 PM PDT, Harvey
White <madyn@...> wrote:
There's pretty much three types of tubes in
terms of what's inside the
envelope.? Don't mean triode, etc.
Voltage regulators, i.e 5651 or OD3, are essentially BIG
neon lamps that
glow, and the ionized mixture of gasses has a relatively
stable
maintaining voltage.? They act like a big zener diode,
high voltage one,
though.
Mercury Vapor rectifiers are rectifiers where mercury has
been added.?
In some cases, like the 2D21 thyratron, they fire, then
stay fired until
the cathode/plate voltage drops below the maintaining
voltage.? They
cannot be turned off, and act like SCRs.
Regular tubes act much like (IIRC) depletion mode FETs.?
WIth 0 cathode
to grid voltage, they conduct fully, as the grid voltage
goes negative,
the current flow drops until you hit cutoff.
Only the voltage regulators and the mercury vapor
rectifiers (which need
a warmup period to vaporize the mercury) are supposed to
glow inside at all.
IMHO, any *normal* vacuum tube that glows has an excess of
unwanted gas
will glow, and not work properly.
Harvey
On 10/27/2021 6:16 PM, Richard Knoppow wrote:
> ?? I am curious about those glowing tubes. The one
that glows pink and
> purple might be very gassy but the only tubes I've
seen that glow
> orange are 5651 voltage reference tubes. I wonder if
you mght have
> tubes in the wrong sockets or something of the sort.
>
> On 10/27/2021 2:27 PM, Morris Odell wrote:
>> You should replace both tubes as the gassy one at
least? looks like
>> it has had a hard life. That might be all you
need to get the 200CD
>> going again. BTW the voltages quoted on the
schematic are all
>> measured with the unit warmed up i.e. at least 60
seconds after
>> switch-on. I'd be interested to know what the
voltage across R40 is
>> once it's working. Depending on how I've
recalculated it, it should
>> be between -150 and -180 volts.
>>
>> Morris
>>
>
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Most power amp output tubes (6AQ5, 6L6, EL34, etc) will glow a beautiful blue.
Suspect the EL86 would as well.
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Another tube that glows orange is VR75.
On Wednesday, October 27, 2021, 05:00:05 PM PDT, Harvey White <madyn@...> wrote:
There's pretty much three types of tubes in terms of what's inside the
envelope.? Don't mean triode, etc.
Voltage regulators, i.e 5651 or OD3, are essentially BIG neon lamps that
glow, and the ionized mixture of gasses has a relatively stable
maintaining voltage.? They act like a big zener diode, high voltage one,
though.
Mercury Vapor rectifiers are rectifiers where mercury has been added.?
In some cases, like the 2D21 thyratron, they fire, then stay fired until
the cathode/plate voltage drops below the maintaining voltage.? They
cannot be turned off, and act like SCRs.
Regular tubes act much like (IIRC) depletion mode FETs.? WIth 0 cathode
to grid voltage, they conduct fully, as the grid voltage goes negative,
the current flow drops until you hit cutoff.
Only the voltage regulators and the mercury vapor rectifiers (which need
a warmup period to vaporize the mercury) are supposed to glow inside at all.
IMHO, any *normal* vacuum tube that glows has an excess of unwanted gas
will glow, and not work properly.
Harvey
On 10/27/2021 6:16 PM, Richard Knoppow wrote:
> ?? I am curious about those glowing tubes. The one that glows pink and
> purple might be very gassy but the only tubes I've seen that glow
> orange are 5651 voltage reference tubes. I wonder if you mght have
> tubes in the wrong sockets or something of the sort.
>
> On 10/27/2021 2:27 PM, Morris Odell wrote:
>> You should replace both tubes as the gassy one at least? looks like
>> it has had a hard life. That might be all you need to get the 200CD
>> going again. BTW the voltages quoted on the schematic are all
>> measured with the unit warmed up i.e. at least 60 seconds after
>> switch-on. I'd be interested to know what the voltage across R40 is
>> once it's working. Depending on how I've recalculated it, it should
>> be between -150 and -180 volts.
>>
>> Morris
>>
>
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There's pretty much three types of tubes in terms of what's inside the envelope.? Don't mean triode, etc.
Voltage regulators, i.e 5651 or OD3, are essentially BIG neon lamps that glow, and the ionized mixture of gasses has a relatively stable maintaining voltage.? They act like a big zener diode, high voltage one, though.
Mercury Vapor rectifiers are rectifiers where mercury has been added.? In some cases, like the 2D21 thyratron, they fire, then stay fired until the cathode/plate voltage drops below the maintaining voltage.? They cannot be turned off, and act like SCRs.
Regular tubes act much like (IIRC) depletion mode FETs.? WIth 0 cathode to grid voltage, they conduct fully, as the grid voltage goes negative, the current flow drops until you hit cutoff.
Only the voltage regulators and the mercury vapor rectifiers (which need a warmup period to vaporize the mercury) are supposed to glow inside at all.
IMHO, any *normal* vacuum tube that glows has an excess of unwanted gas will glow, and not work properly.
Harvey
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Show quoted text
On 10/27/2021 6:16 PM, Richard Knoppow wrote: ?? I am curious about those glowing tubes. The one that glows pink and purple might be very gassy but the only tubes I've seen that glow orange are 5651 voltage reference tubes. I wonder if you mght have tubes in the wrong sockets or something of the sort.
On 10/27/2021 2:27 PM, Morris Odell wrote:
You should replace both tubes as the gassy one at least? looks like it has had a hard life. That might be all you need to get the 200CD going again. BTW the voltages quoted on the schematic are all measured with the unit warmed up i.e. at least 60 seconds after switch-on. I'd be interested to know what the voltage across R40 is once it's working. Depending on how I've recalculated it, it should be between -150 and -180 volts.
Morris
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Re: HP200CD oscillator...
After looking at the pictures I can say for sure that this tube is no good. I would suggest replacing both of them. They are not worth testing in a tube tester unless you're just curious how a defective tube tests.
They are a wonderful oscillator.
Burt, K6OQK
Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California U.S.A.
biwa@...
K6OQK
--
Burt I. Weiner Associates
Broadcast Technical Services
Glendale, CA 91201 U.S.A.
K6OQK
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These were the tubes in the unit when it arrived. Both of these were marked EL86 I recall before cleaning the dust off them and removing the marking inadvertently. They are both in shields so I don’t believe I have anything in the wrong sockets.?
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Do you ship to Australia Tom?
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Re: Agilent/Keysigh ESG series CLIP
Hi Xu?
That makes you the king pin as you have dun a marvellous job with extending the life of HP equipment?
regarding old corespondents I think we may be missing those but if i find any think i will post it?
within Catalogues on this site is a file called?A New scope could I ask you to look at it and upload any missing documented?
advise me on any mistakes and also passably a word document explaining the history of your products?
Best Regards Paul?
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I am curious about those glowing tubes. The one that glows pink and purple might be very gassy but the only tubes I've seen that glow orange are 5651 voltage reference tubes. I wonder if you mght have tubes in the wrong sockets or something of the sort.
toggle quoted message
Show quoted text
On 10/27/2021 2:27 PM, Morris Odell wrote: You should replace both tubes as the gassy one at least? looks like it has had a hard life. That might be all you need to get the 200CD going again. BTW the voltages quoted on the schematic are all measured with the unit warmed up i.e. at least 60 seconds after switch-on. I'd be interested to know what the voltage across R40 is once it's working. Depending on how I've recalculated it, it should be between -150 and -180 volts.
Morris
--
Richard Knoppow
dickburk@...
WB6KBL
|
You should replace both tubes as the gassy one at least? looks like it has had a hard life. That might be all you need to get the 200CD going again. BTW the voltages quoted on the schematic are all measured with the unit warmed up i.e. at least 60 seconds after switch-on. I'd be interested to know what the voltage across R40 is once it's working. Depending on how I've recalculated it, it should be between -150 and -180 volts.
Morris
|
Re: Re-capping an HP-130 Scopes
Yep been a Mr C fan for a while.? He designed a neat little rig that checks for foil side of a cap.? I think my second build ever.? Works great.? I even took apart a few spare modern caps to see if the the Mr C?SIFT works and it does.
The old 'Amp' test is one that works as well.? Plug the cap into a guitar amp crank up the volume and you can hear the foil side.
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Re: Agilent/Keysigh ESG series CLIP
Chief cook and bottle washer! ;)? ? Jim Ford?
Sent from my Verizon, Samsung Galaxy smartphone
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-------- Original message -------- From: "Xu Wang via groups.io" <simmconn@...> Date: 10/27/21 12:18 PM (GMT-08:00) Subject: Re: [HP-Agilent-Keysight-equipment] Agilent/Keysigh ESG series CLIP
Hi Paul, I was talking about license to reproduce and distribute HP manuals. If there is some correspondence from HP that grants the permission to the public to do so, like in the case with Tek, it would be very helpful to let everyone know so there would be absolutely no concerns. I'm the only engineer here at SIMMCONN LABS, also the only sales, marketing, buyer, planner, facility guy and janitor. -Xu
?
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Re: Agilent/Keysigh ESG series CLIP
Em 27/10/2021 16:18, Xu Wang via groups.io escreveu: Hi Paul,
I was talking about license to reproduce and distribute HP manuals. If there is some correspondence from HP that grants the permission to the public to do so, like in the case with Tek, it would be very helpful to let everyone know so there would be absolutely no concerns.
I'm the only engineer here at SIMMCONN LABS, also the only sales, marketing, buyer, planner, facility guy and janitor. ^^^^^^^^^ HAHAHA I LOLed =) Congratulations for your nice products, Xu! 73 de PU2SEX Alexandre -- ---8<---Corte Aqui---8<---
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Re: Agilent/Keysigh ESG series CLIP
Hi Paul, I was talking about license to reproduce and distribute HP manuals. If there is some correspondence from HP that grants the permission to the public to do so, like in the case with Tek, it would be very helpful to let everyone know so there would be absolutely no concerns. I'm the only engineer here at SIMMCONN LABS, also the only sales, marketing, buyer, planner, facility guy and janitor. -Xu
?
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Re: Looking to buy HP6268B 40V 30A Power Supply
Alex:
I bought and rebuilt a 6268B,I was told it was working,which it was not.
All of the black diodes were rendered to grey dust but easily replaced. How this happened, I don't have a clue.The only "unique"? part I replaced was a little transformer that I had to find a substitute for .
I think it was a "pulse" transformer. About the size of a DIP relay. It is not a snap to align this thing but I did it, so it cannot be that hard. All transformers "Hum" they are musical. I cannot hear the hum over the fan noise, which is not inconsequential. Run mine at 28 Volts for a GRC 106 military radio mostly.
I bought the PS because I was sick and tired of dealing with birdies on SMPS PS. This thing has no birdies. (Maybe the humming scares them?)
A really nice PS.
Wally KC9INK
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Burt K6OQK
Paul Bicknell
Alexandre Souza