[R-390] Re: R-390 digest, Vol 1 #983 - 14 msgs
Bernie Nicholson
[email protected]
Sun, 8 Feb 2004 21:36:37 +1100
MEGGARS Hi guys I have always used a meggar for testing capacitors
and high value resistors ,I have been an Electrician since the 1960 s ,
meggars come in various shapes and sizes 500 v is the smallest in australia
because it is normal to test insulation resistance at twice the applied
voltage which here is 240v they also use 1000v meggars here to check
Insulationt on line voltage circuits which is 415 here . In the U.S.A this
is 208v ,One thing I should say is DO NOT check capacitors that have a
lower working voltage than 500 marked on them as they are likley to be
damaged by the meggar also it is possible to charge up capacitors with the
meggar and get quiet a shock!!!! also DONT check ELECTROLYTICS as they dont
like AC . I had a very noisy IF module in a 390a and when I meggar tested
the bypass caps they were ALL leaky , they were the axial black ones with
the coloured bands around them after replacing them it is a different radio
, I once had a tektronix 500 series CRO and the timbase would not work ,I
got it from the gov surplus auctions-,it had an unrepairable tag on it .I
checked every component in the time base and couldnt find a problem but it
refused to oscillate- then I disconnected one end off every component in the
time base and trigger and holdoff circuit and meggar tested , on testing a
500pf mica cap it read 500megohms this was the culprit ,the timebases were
miller intigrator timebases and they rely for feed back on the stray
capacity of the tube and that 500meg resistor stopped in its tracks , I
venture to surmise that not many instruments would show this fault so u can
see that meggars are very handy with valves OR what u guys call TOOBES -BUT
KEEP IT AWAY FROM THE SOLID STATE HI- Original Message -----
From: <[email protected]>
To: <[email protected]>
Sent: Sunday, February 08, 2004 8:08 PM
Subject: R-390 digest, Vol 1 #983 - 14 msgs
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> Today's Topics:
>
> 1. Re: Museum Quality R-390 Non-A on the E-Place (Patrick)
> 2. RE: Museum Quality R-390 Non-A on the E-Place (Dave and Sharon
Maples)
> 3. About the "more like it..." ([email protected])
> 4. Advice - Proper Use of Meggers (Leigh Sedgwick)
> 5. Re: Advice - Proper Use of Meggers (rbethman)
> 6. Re: Museum Quality R-390 Non-A on the E-Place (Tom Norris)
> 7. Re: Museum Quality R-390 Non-A on the E-Place (John KA1XC)
> 8. Anritsu ([email protected])
> 9. Re: Advice - Proper Use of Meggers (Cecil Acuff)
> 10. Re: Advice - Proper Use of Meggers ([email protected])
> 11. Re: Museum Quality R-390 Non-A on the E-Place (signalshifter)
> 12. Orange Drops, not just for radio any more (Tom Norris)
> 13. Going rate for a ZM-3A? (Tom Norris)
> 14. Meggers (Pete Young)
>
> --__--__--
>
> Message: 1
> From: "Patrick" <[email protected]>
> To: <[email protected]>
> Subject: Re: [R-390] Museum Quality R-390 Non-A on the E-Place
> Date: Sat, 7 Feb 2004 06:57:22 -0500
>
> Let's no be more papist than the Pope, otherwise he would never be able =
> to enter the Sistene Chapel on account that the ceiling does not have =
> the original painting, nor we could enjoy the Statue of Liberty because =
> now it has modern electrical wiring, go up the Washington Monument =
> because the elevator is not the same.
>
> Most Museum pieces have been restored and very often improved by the new =
> restoration techniques that does not disqualify them from being a museum =
> piece.
>
> If I had a radio museum, I would be glad to display the subject radio - =
> it looks great, probably better than new - and if some qualifying notes =
> needed to be added to the display, so be it.
>
> I would be willing to bet that none of the critics of the radio would =
> believe that any of the items on the Aero Space Museum are in their =
> original/unaltered condition and that they would perform as they did =
> when in service.
>
> Let's be more flexible and less critical, enjoy......life is to short =
> .....
>
> Pat
>
> --- StripMime Report -- processed MIME parts ---
> multipart/alternative
> text/plain (text body -- kept)
> text/html
> The reason this message is shown is because the post was in HTML
> or had an attachment. Attachments are not allowed. To learn how
> to post in Plain-Text go to: http://www.expita.com/nomime.html ---
>
> --__--__--
>
> Message: 2
> From: "Dave and Sharon Maples" <[email protected]>
> To: "Patrick" <[email protected]>, <[email protected]>
> Subject: RE: [R-390] Museum Quality R-390 Non-A on the E-Place
> Date: Sat, 7 Feb 2004 08:44:07 -0500
>
> All: Very well put by Patrick, IMHO.
>
> We are not here to worship these items, but to enjoy them. For me, I'll
> accept an intelligently-conceived, skillfully-carried-out modification
that
> enhances the safety of one of these things. I added an IEC-based CORCOM
> filter and a 3-wire power cord to my R-390A for just that reason. Others
> may disapprove; that's fine.
>
> Opinions are like socks in a drawer. There's lots of them, usually they
are
> mismatched, and sometimes they have holes in them. Except, of course, for
> MY opinions, which are ALWAYS absolutely well-informed, full of wisdom for
> all ages, exquisitely reasoned, etc., etc., etc. (I'm running a deal on
> slightly-used bridges for sale, too!).
>
> Dave WB4FUR
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]]On
> Behalf Of Patrick
> Sent: Saturday, February 07, 2004 6:57 AM
> To: [email protected]
> Subject: Re: [R-390] Museum Quality R-390 Non-A on the E-Place
>
>
> Let's no be more papist than the Pope, otherwise he would never be able to
> enter the Sistene Chapel on account that the ceiling does not have the
> original painting, nor we could enjoy the Statue of Liberty because now it
> has modern electrical wiring, go up the Washington Monument because the
> elevator is not the same.
>
> Most Museum pieces have been restored and very often improved by the new
> restoration techniques that does not disqualify them from being a museum
> piece.
>
> If I had a radio museum, I would be glad to display the subject radio - it
> looks great, probably better than new - and if some qualifying notes
needed
> to be added to the display, so be it.
>
> I would be willing to bet that none of the critics of the radio would
> believe that any of the items on the Aero Space Museum are in their
> original/unaltered condition and that they would perform as they did when
in
> service.
>
> Let's be more flexible and less critical, enjoy......life is to short
.....
>
> Pat
>
> --- StripMime Report -- processed MIME parts ---
> multipart/alternative
> text/plain (text body -- kept)
> text/html
> The reason this message is shown is because the post was in HTML
> or had an attachment. Attachments are not allowed. To learn how
> to post in Plain-Text go to: http://www.expita.com/nomime.html ---
> _______________________________________________
> R-390 mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/r-390
>
>
>
> --__--__--
>
> Message: 3
> Date: Sat, 7 Feb 2004 08:23:18 -0800 (PST)
> From: <[email protected]>
> To: [email protected]
> Subject: [R-390] About the "more like it..."
>
> Hey,
>
> If the jerks are gone, I might even be willing to post
> again..Oh well...Maybe I was one of the jerks....
>
> John (still reading....)
>
> __________________________________
> Do you Yahoo!?
> Yahoo! Finance: Get your refund fast by filing online.
> http://taxes.yahoo.com/filing.html
>
> --__--__--
>
> Message: 4
> Date: Sat, 07 Feb 2004 08:49:00 -0800
> From: Leigh Sedgwick <[email protected]>
> To: [email protected]
> Subject: [R-390] Advice - Proper Use of Meggers
>
> I recently picked up a megger but, honestly, I don't know
> much about them. They are apparently great for checking
> leakage through caps which is the main reason I bought it.
>
> For the record, it is a old Navy unit made by Winslow
> Teletronics, Inc., Model ZM-63/PSM-35 with a Navy
> designation of AN/PSM-35. It measures Megohms resistance at
> 500V.
>
> I notice that I can vary the output voltage by rotating the
> crank at a slower speed but the readings fluctuate. So I
> take it, that the proper use requires rotating the crank at
> normal speed and full-voltage output? While 500V is fine
> for some caps, it typically exceeds some of the smaller caps
> found in receiver boat anchor receivers. So, does one need
> a smaller unit for lower voltage caps to get reliable
> readings.
>
> Sorry for my ignorance on the subject, I've just never used
> one of these. Can someone shed some light on this subject
> for me or point me at a reference for their proper use. Any
> manuals available for this animal?
>
> BTW, just finished tearing apart my RF deck and cleaning all
> the gears. I found that even a clean looking unit like mine
> was before I started, should be rebuilt...many gears were
> stuck together from hardening of the lubrication oil even
> though they looked quite good to the naked "eye". I'm
> looking forward to experiencing the "smooth" action of an
> R-390A.
>
> Hey thanks all...
>
> 73 de Mike
> K7PI
> Mercer Island, WA
>
> --__--__--
>
> Message: 5
> Date: Sat, 07 Feb 2004 11:56:50 -0500
> From: rbethman <[email protected]>
> To: Leigh Sedgwick <[email protected]>
> Cc: [email protected]
> Subject: Re: [R-390] Advice - Proper Use of Meggers
>
> Mike,
>
> These are used normally to test high voltage cables, transformers,,
> and generator windings.
>
> I don't believe that testing capacitors is recommended.
>
> Bob - N0DGN
>
> Leigh Sedgwick wrote:
>
> >I recently picked up a megger but, honestly, I don't know
> >much about them. They are apparently great for checking
> >leakage through caps which is the main reason I bought it.
> >
> >For the record, it is a old Navy unit made by Winslow
> >Teletronics, Inc., Model ZM-63/PSM-35 with a Navy
> >designation of AN/PSM-35. It measures Megohms resistance at
> >500V.
> >
> >I notice that I can vary the output voltage by rotating the
> >crank at a slower speed but the readings fluctuate. So I
> >take it, that the proper use requires rotating the crank at
> >normal speed and full-voltage output? While 500V is fine
> >for some caps, it typically exceeds some of the smaller caps
> >found in receiver boat anchor receivers. So, does one need
> >a smaller unit for lower voltage caps to get reliable
> >readings.
> >
> >Sorry for my ignorance on the subject, I've just never used
> >one of these. Can someone shed some light on this subject
> >for me or point me at a reference for their proper use. Any
> >manuals available for this animal?
> >
> >BTW, just finished tearing apart my RF deck and cleaning all
> >the gears. I found that even a clean looking unit like mine
> >was before I started, should be rebuilt...many gears were
> >stuck together from hardening of the lubrication oil even
> >though they looked quite good to the naked "eye". I'm
> >looking forward to experiencing the "smooth" action of an
> >R-390A.
> >
> >Hey thanks all...
> >
> >73 de Mike
> >K7PI
> >Mercer Island, WA
> >_______________________________________________
> >R-390 mailing list
> >[email protected]
> >http://mailman.qth.net/mailman/listinfo/r-390
> >
> >
> >
>
> --
> < Bob Bethman - N0DGN
> +-------------------------------+----------------------------------+
> | N0DGN AMRadio Manassas, VA | Home Builder |
> +-------------------------------+----------------------------------+
> | Bob Bethman \\\|/// " The absence of a danger |
> | <[email protected]> \\ ~ ~ // signal does *NOT* mean |
> | Bethman Fine Homes (/ @ @ /) that everything is OK " |
> +-------------------------oOOo-(_)-oOOo----------------------------+
> | <http://home.comcast.net/~rbethman> |
> | 1 BC-610I w/BC-614I,1 T-213/GRC-26 w/BC614I 1 '51 Collins R-390A |
> | 1 '67 EAC R-390A, Heathkit DX-60, Apache, Mohawk, SX-101, HT-32A |
> +------------------------------------------------------------------+
> | Amateur Astronomer - Celestron Nexstar 8 |
> | 12" f5 Dob coming soon! Being built |
> | Meade ETX-60 (Got it back!) |
> | 38 Deg 46.8' N - 77 Deg 28.5' W |
> +------------------------------------------------------------------+
> | Opinions expressed are that of my own and do not necessarily |
> | coincide with or represent those of ANYONE else |
> +------------------------------------------------------------------+
> ALL E-mail received and sent scanned by AVG & Norton Anti-Virus>
>
>
>
>
> --__--__--
>
> Message: 6
> Date: Sat, 7 Feb 2004 12:05:59 -0600
> To: [email protected]
> From: Tom Norris <[email protected]>
> Subject: Re: [R-390] Museum Quality R-390 Non-A on the E-Place
>
> >
> >Most Museum pieces have been restored and very often improved by the
> >new restoration techniques that does not disqualify them from being
> >a museum piece.
> >
>
> Thinks like the IERC tube shields are "authorized" updates that
> *could* have been done
> in its lifetime.
>
> Tom
>
> --__--__--
>
> Message: 7
> From: "John KA1XC" <[email protected]>
> To: "R-390 reflector" <[email protected]>
> Subject: Re: [R-390] Museum Quality R-390 Non-A on the E-Place
> Date: Sat, 7 Feb 2004 14:53:04 -0500
>
> Well said Patrick,
> but you've got to remember that with a list such as this one there is a
huge
> amount of hard won expertise.
> So when an R-39x Ebay ad appears with a lot of high power adjectives and
an
> even higher price tag it's no wonder that it becomes open season on making
> comments. Tough crowd here! ;^)
>
> Actually there is no requirement that a Museum piece even functions. I
just
> got back from a Florida trip and on the way back stopped at The Mighty 8th
> Air Force (B-17) Museum which is right off I-95 North in Georgia. They had
> two BC-348 receivers on display inside; neither were powered up so who
knows
> if they even worked?
>
> They also have a beautifully restored B-47 SAC bomber outside but I'm sure
> it's in no condition to fly! But it was really cool seeing one up close,
> always wanted to see one since reading about the RB-47 Russian flyover
> missions described in Bamford's Body of Secrets book. Who knows, maybe
there
> was even R-648 receiver inside of it. (that's the airborne version of the
> R-390A).
>
> John
> KA1XC
>
> ----- Original Message -----
> From: "Patrick" <[email protected]>
> To: <[email protected]>
> Sent: Saturday, February 07, 2004 6:57 AM
> Subject: Re: [R-390] Museum Quality R-390 Non-A on the E-Place
>
>
> Let's no be more papist than the Pope, otherwise he would never be able to
> enter the Sistene Chapel on account that the ceiling does not have the
> original painting, nor we could enjoy the Statue of Liberty because now it
> has modern electrical wiring, go up the Washington Monument because the
> elevator is not the same.
>
> Most Museum pieces have been restored and very often improved by the new
> restoration techniques that does not disqualify them from being a museum
> piece.
>
> If I had a radio museum, I would be glad to display the subject radio - it
> looks great, probably better than new - and if some qualifying notes
needed
> to be added to the display, so be it.
>
> I would be willing to bet that none of the critics of the radio would
> believe that any of the items on the Aero Space Museum are in their
> original/unaltered condition and that they would perform as they did when
in
> service.
>
> Let's be more flexible and less critical, enjoy......life is to short
.....
>
> Pat
>
>
>
>
> --__--__--
>
> Message: 8
> Date: Sat, 7 Feb 2004 13:48:29 -0800 (PST)
> From: <[email protected]>
> To: [email protected]
> Subject: [R-390] Anritsu
>
> Friends,
> In speaking of the "best" (one more time...!)...
>
> We know the test gear, but has anyone ever operated
> the early 50's, back to post war, rec.,by Anritsu?
>
> Have a family friend who still speaks English poorly,
> that was "the enemy" in the early 40's, (tho' he is
> just a few years older than me),and he insists the mil
> equip around '45-'52+ was as good as could be had. (He
> came to this country in '55, at age 22...He was a
> japanese el. engineer, and continued in America....)
>
> As the modern equip. is so good, I wonder about the
> radios..
>
> Regards, John
>
> __________________________________
> Do you Yahoo!?
> Yahoo! Finance: Get your refund fast by filing online.
> http://taxes.yahoo.com/filing.html
>
> --__--__--
>
> Message: 9
> From: "Cecil Acuff" <[email protected]>
> To: "rbethman" <[email protected]>,
> "Leigh Sedgwick" <[email protected]>
> Cc: <[email protected]>
> Subject: Re: [R-390] Advice - Proper Use of Meggers
> Date: Sat, 7 Feb 2004 17:26:39 -0600
>
> The use of a hand cranked meggar was outlined in one of Chuck Rippel's
> videos on radio restoration...can't remember if it was the SP-600 video or
> the R-390..not important....It worked very well.
>
> Don't remember the specifics...
>
> Cecil....
> ----- Original Message -----
> From: "rbethman" <[email protected]>
> To: "Leigh Sedgwick" <[email protected]>
> Cc: <[email protected]>
> Sent: Saturday, February 07, 2004 10:56 AM
> Subject: Re: [R-390] Advice - Proper Use of Meggers
>
>
> > Mike,
> >
> > These are used normally to test high voltage cables, transformers,,
> > and generator windings.
> >
> > I don't believe that testing capacitors is recommended.
> >
> > Bob - N0DGN
> >
> > Leigh Sedgwick wrote:
> >
> > >I recently picked up a megger but, honestly, I don't know
> > >much about them. They are apparently great for checking
> > >leakage through caps which is the main reason I bought it.
> > >
> > >For the record, it is a old Navy unit made by Winslow
> > >Teletronics, Inc., Model ZM-63/PSM-35 with a Navy
> > >designation of AN/PSM-35. It measures Megohms resistance at
> > >500V.
> > >
> > >I notice that I can vary the output voltage by rotating the
> > >crank at a slower speed but the readings fluctuate. So I
> > >take it, that the proper use requires rotating the crank at
> > >normal speed and full-voltage output? While 500V is fine
> > >for some caps, it typically exceeds some of the smaller caps
> > >found in receiver boat anchor receivers. So, does one need
> > >a smaller unit for lower voltage caps to get reliable
> > >readings.
> > >
> > >Sorry for my ignorance on the subject, I've just never used
> > >one of these. Can someone shed some light on this subject
> > >for me or point me at a reference for their proper use. Any
> > >manuals available for this animal?
> > >
> > >BTW, just finished tearing apart my RF deck and cleaning all
> > >the gears. I found that even a clean looking unit like mine
> > >was before I started, should be rebuilt...many gears were
> > >stuck together from hardening of the lubrication oil even
> > >though they looked quite good to the naked "eye". I'm
> > >looking forward to experiencing the "smooth" action of an
> > >R-390A.
> > >
> > >Hey thanks all...
> > >
> > >73 de Mike
> > >K7PI
> > >Mercer Island, WA
> > >_______________________________________________
> > >R-390 mailing list
> > >[email protected]
> > >http://mailman.qth.net/mailman/listinfo/r-390
> > >
> > >
> > >
> >
> > --
> > < Bob Bethman - N0DGN
> > +-------------------------------+----------------------------------+
> > | N0DGN AMRadio Manassas, VA | Home Builder |
> > +-------------------------------+----------------------------------+
> > | Bob Bethman \\\|/// " The absence of a danger |
> > | <[email protected]> \\ ~ ~ // signal does *NOT* mean |
> > | Bethman Fine Homes (/ @ @ /) that everything is OK " |
> > +-------------------------oOOo-(_)-oOOo----------------------------+
> > | <http://home.comcast.net/~rbethman> |
> > | 1 BC-610I w/BC-614I,1 T-213/GRC-26 w/BC614I 1 '51 Collins R-390A |
> > | 1 '67 EAC R-390A, Heathkit DX-60, Apache, Mohawk, SX-101, HT-32A |
> > +------------------------------------------------------------------+
> > | Amateur Astronomer - Celestron Nexstar 8 |
> > | 12" f5 Dob coming soon! Being built |
> > | Meade ETX-60 (Got it back!) |
> > | 38 Deg 46.8' N - 77 Deg 28.5' W |
> > +------------------------------------------------------------------+
> > | Opinions expressed are that of my own and do not necessarily |
> > | coincide with or represent those of ANYONE else |
> > +------------------------------------------------------------------+
> > ALL E-mail received and sent scanned by AVG & Norton Anti-Virus>
> >
> >
> >
> > _______________________________________________
> > R-390 mailing list
> > [email protected]
> > http://mailman.qth.net/mailman/listinfo/r-390
> >
>
>
>
> --__--__--
>
> Message: 10
> Date: Sat, 7 Feb 2004 18:32:41 -0500 (EST)
> From: <[email protected]>
> To: <[email protected]>
> Subject: Re: [R-390] Advice - Proper Use of Meggers
>
>
> Have your boy crank until he develops a fine sheen of sweat.
>
> If he is dripping, he's working too hard and will be useless by days end.
> There is also a risk of sweat drops affecting the local conductance.
>
> If he is not sweating, either he's not cranking enough, or it's too cold
> to be working. If the later, go sit by the fire and break out some scotch.
>
>
>
> Megger for sale.
>
> You can.
>
> Measure resistance of your ground system.
> Perform geophysical surveys to find ground water or minerals.
> "Coax worms from the ground" for fishing.
> Extract information from children as to WHY they were not cranking the
> megger fast enough.
> Stimulate plants "to produce SUPER tomatos"
>
> Biddle, last calibrated 1995. Calibration should hold for at least 100
> years.
>
> $400, seriously, I would not sell for less as this is a weeks RENT on one.
> pick up Canton GA, 30114
>
> -Bob
>
>
>
> --__--__--
>
> Message: 11
> From: "signalshifter" <[email protected]>
> To: "b w" <[email protected]>
> Cc: <[email protected]>
> Subject: Re: [R-390] Museum Quality R-390 Non-A on the E-Place
> Date: Sat, 7 Feb 2004 20:07:22 -0700
>
> If it has a bluish finish it was probably Kromacoated. This is a chemical
> protective coating used on sheet metal, ferrous and non ferrous, it gives
> the metal a bluish mother of pearl look.
>
>
> Ken de W7ITC
>
> --__--__--
>
> Message: 12
> Date: Sat, 7 Feb 2004 21:29:47 -0600
> To: [email protected], [email protected]
> From: Tom Norris <[email protected]>
> Subject: [R-390] Orange Drops, not just for radio any more
>
> Will the price of Orange Drop caps go through the roof now
> that the secret is out that they are good for vintage audio
> gear too? Check item number 3701942877 on you know where
> and decide for yourself. *twitch*
>
> Tom
>
>
>
> --__--__--
>
> Message: 13
> Date: Sat, 7 Feb 2004 21:41:45 -0600
> To: [email protected]
> From: Tom Norris <[email protected]>
> Cc: [email protected]
> Subject: [R-390] Going rate for a ZM-3A?
>
> What is the going rate for a ZM-3A cap tester these days?
> I may have found one, but don't want to pay *too* much for
> it. ( I'm cheap.)
>
> Thanks
>
> Tom
>
> --__--__--
>
> Message: 14
> Date: Sat, 07 Feb 2004 23:51:04 -0500
> To: [email protected]
> From: Pete Young <[email protected]>
> Subject: [R-390] Meggers
>
> Meggers are great for making sure you're WIDE AWAKE
> in the morning! Years ago I was working in the product test
> department at Norlin, which built receivers. I accidentally
> hi-potted myself, and my right leg kicked so hard, the heel
> came off my boot and flew across the room. Didn't need
> any more coffee that day!
>
> I'm new to this group. I'm Pete, K3IN, and I have an old
> 1955 (I think) Collins-made R-390A, which is probably due
> for re-capping. I've really enjoyed reading this group, learned
> a lot, and decided to jump in!
> 73,
> Pete
>
> >I recently picked up a megger but, honestly, I don't know
> >much about them. They are apparently great for checking
> ...snip...
> meg
>
>
>
>
> --__--__--
>
> _______________________________________________
> R-390 mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/r-390
>
>
> End of R-390 Digest