[R-390] Re: R-390a For sale
tkinney
[email protected]
Fri, 30 Aug 2002 16:13:47 -0400
Anybody in Wis interested in a all SW Mish rebuilt R-390a, with speaker, =
manuals, spare tubes (yes the hard to get ones) RF connectors, spare =
covers,?...Am moving and no longer have the room. $800.00 ? Contact me =
off list .
Tom Kinney
KE9UE
----- Original Message -----=20
From: <[email protected]>
To: <[email protected]>
Sent: Thursday, August 29, 2002 4:01 AM
Subject: R-390 digest, Vol 1 #370 - 7 msgs
> Send R-390 mailing list submissions to
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> Today's Topics:
>=20
> 1. cheap HV p/s ([email protected])
> 2. A tale of two IF decks. (Philip B Atchley)
> 3. Re: A tale of two IF decks. ([email protected])
> 4. Re: A tale of two IF decks. (Joe Foley)
> 5. Re: A tale of two IF decks. ([email protected])
> 6. Depot Dawg / Capacitor leakage test (Rodney Bunt)
> 7. Re: Depot Dawg / Capacitor leakage test (Bill Smith)
>=20
> --__--__--
>=20
> Message: 1
> From: [email protected]
> Date: Wed, 28 Aug 2002 18:25:09 EDT
> To: [email protected]
> Subject: [R-390] cheap HV p/s
>=20
> I have used the HV p/s and VTVM method since Dr. Jerry told me about =
it. It=20
> works perfectly. An excellent HV p/s is the one in the old Heathkit =
cap=20
> checkers. They can be had for almost nothing.....
>=20
> Unless you check a cap at rated DC voltage, it means little. All the =
bypass=20
> (and some of the coupling) caps in my 75A-4 checked perfectly on my =
NIST=20
> calibrated cap tester, (checks value only). They were all nfg at =
voltage.
> Yes, it does make a difference! The A-4 really sounds perfect now.
>=20
> ron
> N4UE
>=20
> --__--__--
>=20
> Message: 2
> To: [email protected]
> Date: Wed, 28 Aug 2002 23:31:03 +0000
> From: Philip B Atchley <[email protected]>
> Subject: [R-390] A tale of two IF decks.
>=20
> Hello one more.
> Just pulled the IF deck from Dons R-390A. Even before pulling it I
> "suspected" it was an "older" unit. It is, it's an early Collins IF
> deck. =20
>=20
> So, out of curiosity, I put it next to the '67 EAC IF deck from my
> receiver. There are many observable differences. =20
>=20
> They are...
>=20
> 1. Most noticeable is the lack of filter trimmers on the Collins =
unit.
>=20
> 2. The Collins appears to be "neater" in it's construction. I.E. =
The
> cable harness is much neater, point to point wiring is neater also.
>=20
> 3. The Collins has everything coated with that MFP crap which is =
going
> to make re-capping a tougher job.
>=20
> 4. The EAC deck had nearly all capacitors of the newer type, I.E. =
Yellow
> Aerovox and metal/glass. Only one "Brown beauty". The Collins is =
full
> of the BBOD's =20
>=20
> I believe this is an example where I'd take the EAC over the Collins
> every time as it has all the updates.
>=20
> 73 de Phil KO6BB
> Loving home provided for wayward Boatanchor Receivers
> [email protected]
> Merced, Central California
> 37.18N 120.29W CM97sh
>=20
> ________________________________________________________________
> GET INTERNET ACCESS FROM JUNO!
> Juno offers FREE or PREMIUM Internet access for less!
> Join Juno today! For your FREE software, visit:
> http://dl.www.juno.com/get/web/.
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> --__--__--
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> Message: 3
> Date: Wed, 28 Aug 2002 19:45:15 -0400
> From: [email protected]
> Subject: Re: [R-390] A tale of two IF decks.
> To: [email protected]
> Organization: REAL GLOW RADIO! - Manassas, VA
>=20
> I noticed a couple of other differences between an early Collins IF - =
S/N 35
> vs. a '67 EAC IF. The Collins Z503 and the like do NOT have holes in =
them
> to allow adjustment.
>=20
> The early Collins IFs that I saw WITH holes, were obviously NOT done =
at time
> of manufacture. It is easy to see that they were drilled out later. =
They
> usually have "flashing" around them.
>=20
> I am guessing, but it was probably done at a later date to align them.
>=20
> Bob - N0DGN Craf-T-Bob (mywebpages.comcast.net/rbethman/)
> (Because I love Hallicrafters!) R-390A EAC '67, R-390A Collins '52,
> BC-610I, BC-939B, and BC-614E
>=20
>=20
> ----- Original Message ----- From: "Philip B Atchley"
>=20
> | Hello one more.
> | Just pulled the IF deck from Dons R-390A. Even before pulling it I
> | "suspected" it was an "older" unit. It is, it's an early Collins IF
> | deck.
> |
> | So, out of curiosity, I put it next to the '67 EAC IF deck from my
> | receiver. There are many observable differences.
> |
> | They are...
> |
> | 1. Most noticeable is the lack of filter trimmers on the Collins =
unit.
> |
> | 2. The Collins appears to be "neater" in it's construction. I.E. =
The
> | cable harness is much neater, point to point wiring is neater also.
> |
> | 3. The Collins has everything coated with that MFP crap which is =
going
> | to make re-capping a tougher job.
> |
> | 4. The EAC deck had nearly all capacitors of the newer type, I.E. =
Yellow
> | Aerovox and metal/glass. Only one "Brown beauty". The Collins is =
full
> | of the BBOD's
> |
> | I believe this is an example where I'd take the EAC over the Collins
> | every time as it has all the updates.
>=20
>=20
>=20
> --__--__--
>=20
> Message: 4
> Date: Wed, 28 Aug 2002 16:50:18 -0700 (PDT)
> From: Joe Foley <[email protected]>
> Subject: Re: [R-390] A tale of two IF decks.
> To: [email protected]
>=20
>=20
> --- [email protected] wrote:
> > I noticed a couple of other differences between an
> > early Collins IF - S/N 35
> > vs. a '67 EAC IF. The Collins Z503 and the like do
> > NOT have holes in them
> > to allow adjustment.
> >=20
> > The early Collins IFs that I saw WITH holes, were
> > obviously NOT done at time
> > of manufacture. It is easy to see that they were
> > drilled out later. They
> > usually have "flashing" around them.
> >=20
> > I am guessing, but it was probably done at a later
> > date to align them.
> ++++
> This is covered in the manual!
>=20
> The first step to doing an alignment is to punch holes
> in those cans.
>=20
> Joe
>=20
> __________________________________________________
> Do You Yahoo!?
> Yahoo! Finance - Get real-time stock quotes
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> --__--__--
>=20
> Message: 5
> From: [email protected]
> Date: Wed, 28 Aug 2002 20:32:34 EDT
> Subject: Re: [R-390] A tale of two IF decks.
> To: [email protected], [email protected]
>=20
>=20
> In a message dated 8/28/02 6:34:41 PM, [email protected] writes:
>=20
> << Hello one more.
> Just pulled the IF deck from Dons R-390A. Even before pulling it I
> "suspected" it was an "older" unit. It is, it's an early Collins IF
> deck. =20
>=20
> So, out of curiosity, I put it next to the '67 EAC IF deck from my
> receiver. There are many observable differences. =20
>=20
> They are...
>=20
> 1. Most noticeable is the lack of filter trimmers on the Collins =
unit.
>=20
> Standard, Phil, the early Collins and mororola units wer like this.
>=20
> 2. The Collins appears to be "neater" in it's construction. I.E. =
The
> cable harness is much neater, point to point wiring is neater also.
>=20
> that's because the EAC chassis were "formed" after the wiring and =
caps,=20
> resistors etc. were added. Then, they were "bent".
>=20
> 3. The Collins has everything coated with that MFP crap which is =
going
> to make re-capping a tougher job.
>=20
> That's one reason IMHO they are less desirable.
>=20
> 4. The EAC deck had nearly all capacitors of the newer type, I.E. =
Yellow
> Aerovox and metal/glass. Only one "Brown beauty". The Collins is =
full
> of the BBOD's =20
>=20
> Another reason........making sense isn't it?????
>=20
> I believe this is an example where I'd take the EAC over the Collins
> every time as it has all the updates.
>=20
> 73 de Phil KO6BB
> Loving home provided for wayward Boatanchor Receivers
> [email protected]
> Merced, Central California
> 37.18N 120.29W CM97sh
>=20
> I have said for many years, that I would prefer anything but a Collins =
or=20
> Motorola in a R-390A.
>=20
> It speaks for itself.
>=20
> Les Locklear
>=20
>=20
>=20
> --__--__--
>=20
> Message: 6
> Date: Wed, 28 Aug 2002 18:45:09 -0700 (PDT)
> From: Rodney Bunt <[email protected]>
> To: Drew Papanek <[email protected]>
> Cc: [email protected]
> Subject: [R-390] Depot Dawg / Capacitor leakage test
>=20
> The maximum voltage would be the "battery" inside the DVM say 9v. Only =
a really bad 200v capacitor
> would leak at 9v !!!
>=20
> I have a Heath C3 Capacitance tester, and you can wind up the test =
volts to 450v and observe
> leakage on the magic eye tube as "noise" it is interesting to note how =
much more noise there is as
> you wind up the volts closer to the operating voltage.
>=20
> Have a re-think about this as a testing aid. I got the Heath C3 tester =
on ePay for $30, best
> investment I ever made, I have found capacitors that looked OK with =
the DVM, but were leaky at
> high voltages.
>=20
> Rodney
> VK2KTZ
>=20
> --- Drew Papanek <[email protected]> wrote:
> > Philip,
> >=20
> > In his response to your concerns about capacitors Bob Camp mentioned =
a =20
> > setup for leakage testing using power supply, current limiting =
resistor, and=20
> > microammeter. Chances are you already have the meter with the =
current=20
> > limiting resistor built in. It is your DAM or VTVM (Zin=3D11 meg). =
Use the=20
> > meter in the dc voltage mode. The leakage current can be calculated =
as=20
> > Vmeter/10 meg. The good thing about this test is that it is even =
more=20
> > sensitive than the one Bob mentioned.
> >=20
> > For a detailed description (and debate on all facets of R-390x =
capacitors)=20
> > goto R-390a.net. Select References>Pearls of Wisdom>Recapping. On =
pages 99=20
> > and 100 there it will be, along with much other fascinating reading.
> >=20
> > Drew
> >=20
> >=20
> >=20
> > >Message: 15
> > >From: "Bob Camp" <[email protected]>
> > >To: "Philip B Atchley" <[email protected]>
> > >Cc: <[email protected]>
> > >Subject: Re: [R-390] No "Depot Dawg"
> > >Date: Tue, 27 Aug 2002 02:49:43 -0400
> > >
> > >Hi,
> > >
> > >I guess this is what makes it a hobby. I would vote with you - a =
unit that
> > >is "all original" is slightly cooler than one with mixed modules. =
That's=20
> > >not
> > >to say better or more functional, just cooler. Needless to say this =
issue
> > >has come up before. Of course with very few exceptions (say 10 =
radios)=20
> > >there
> > >is no way to *ever* prove that a radio is original so you never =
really=20
> > >know.
> > >
> > >The metal/glass package capacitors are better than the black =
plastic=20
> > >package
> > >ones. The yellow plastic wrapped ones are Mylar (or similar) with a =
plastic
> > >insulation. About the only disadvantage to the yellow ones is that =
when you
> > >hit them with a soldering iron they melt.
> > >
> > >The thing that makes the black or brown caps a problem is that the
> > >insulation is paper (or paper with mica in it). The stuff soaks up =
humidity
> > >and then they get leaky. The whole process really gets going when =
the case
> > >splits open.
> > >
> > >Leaky capacitors aren't all that hard to check. You can use a =
fairly simple
> > >setup. Get as sensitive a meter dc meter as you can find. A good =
old Weston
> > >or Simpson analog meter works well. If you can find something in =
the 10 or
> > >20 ua range that should do. Then set up about a 100 volt power =
supply.
> > >Stacking two 48 volt units is one approach. One microampere at 100 =
volts
> > >works out to 100 meg ohms. A 10 meg ohm series resistor will keep =
you from
> > >blowing out the meter. New from the old box plastic capacitors will =
all=20
> > >read
> > >"no deflection" on the meter. Every black or brown body cap I have =
ever
> > >checked reads at least a couple of micro amps.
> > >
> > >If you have a doubt about a type of capacitor find one that you can =
pull=20
> > >one
> > >end on. Hook up the tester and see what it reads. If it's ok then =
solder
> > >that end back in. On the truly bad stuff you won't be able to find =
one good
> > >one .....
> > >
> > >Both the green and brown switch wafers will soak up de-oxit. The =
brown ones
> > >swell up a bit more, but they both retain the stuff. In either case =
it's
> > >probably not a good thing, but nether are dirty contacts.
> > >
> > >One thing you might do while you have the RF deck out of the radio =
- meg=20
> > >out
> > >the AGC line and see what it reads. I have never tried it but each =
time I
> > >put a deck back in I kick my self for not thinking of it. I have no =
idea
> > >what it should read, but the schematic should be fairly easy to =
follow.
> > >
> > > Enjoy!
> > >
> > > Bob Camp
> > > KB8TQ
> > >
> > >
> > >
> > >----- Original Message -----
> > >From: "Philip B Atchley" <[email protected]>
> > >To: <[email protected]>
> > >Sent: Monday, August 26, 2002 10:54 PM
> > >Subject: [R-390] No "Depot Dawg"
> > >
> > >
> > > > Hello again.
> > > > Well, today I pulled the IF and RF decks out of my "new" R-390A =
to start
> > > > recapping and refurbing them. As it turns out, all modules (and =
rear
> > > > panel) are EAC with SN's ranging between 7125 and 9961.
> > > >
> > > > Knowing how the depots tended to just throw everything in large =
bins (or
> > > > whatever) and slap the R-390A's back together using whatever =
modules=20
> > >were
> > > > ready to install, I highly suspect that this unit has never been =
through
> > > > depot maintainance. The only thing not EAC is the PTO, which is =
> > >Collins.
> > > > I may put the Cosmos PTO in this unit if I can get endpoints =
etc set
> > > > correctly.
> > > >
> > > > I got the transmission cleaned up really nice today (it wasn't =
very=20
> > >grimy
> > > > anyway). Removed all the coils and cleaned em, "Caiged" the =
sockets for
> > > > the coils. Cleaned the roller bearings on the slug racks etc. =
Got all
> > > > that back together and the whole mechanism is much, much =
smoother and
> > > > easier tuning now. It won't go back in the mainframce until all =
the
> > > > modules are completed, just in case I "forgot" something.
> > > >
> > > > Question 1: The RF and IF decks only have a couple of the =
"Brown
> > > > Beauties", which naturally will be replaced. The rest are =
either flat
> > > > Yellow Aerovox units that "look" relatively modern, or the "West =
Cap"
> > > > metal/glass types. I've heard these were relatively reliable. =
Are
> > > > they???
> > > >
> > > > Question 2: I've used De-Oxit D5 on the bandswitch wafers in =
previous
> > > > restorations, but have since read (somewhere) that it can swell =
the
> > > > phenolic somewhat and cause trouble. The Xtal Oscillator switch =
looks
> > > > like phenolic or bakelight (brown) while the RF deck switch =
wafers are
> > > > green (Fiberglass?) Any truth in this?
> > > >
> > > > 73 de Phil KO6BB
> > > > Loving home provided for wayward Boatanchor Receivers
> > > > [email protected]
> > > > Merced, Central California
> > > > 37.18N 120.29W CM97sh
> > > >
> > > > ________________________________________________________________
> > > > GET INTERNET ACCESS FROM JUNO!
> > > > Juno offers FREE or PREMIUM Internet access for less!
> > > > Join Juno today! For your FREE software, visit:
> > > > http://dl.www.juno.com/get/web/.
> > > > _______________________________________________
> > > > R-390 mailing list
> > > > [email protected]
> > > > http://mailman.qth.net/mailman/listinfo/r-390
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > >
> > >-- __--__--=20
> > >
> > >_______________________________________________
> > >R-390 mailing list
> > >[email protected]
> > >http://mailman.qth.net/mailman/listinfo/r-390
> > >
> > >
> > >End of R-390 Digest
> >=20
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> >=20
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> > _________________________________________________________________
> > Join the world's largest e-mail service with MSN Hotmail.=20
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> > _______________________________________________
> > R-390 mailing list
> > [email protected]
> > http://mailman.qth.net/mailman/listinfo/r-390
>=20
>=20
> __________________________________________________
> Do You Yahoo!?
> Yahoo! Finance - Get real-time stock quotes
> http://finance.yahoo.com
>=20
> --__--__--
>=20
> Message: 7
> From: "Bill Smith" <[email protected]>
> To: <[email protected]>
> Subject: Re: [R-390] Depot Dawg / Capacitor leakage test
> Date: Wed, 28 Aug 2002 23:32:26 -0700
>=20
> Here is a test I use with the Simpson 370 VOM (what else is there to =
use
> with an R-390, or any other receiver, for that matter!). It is only a
> 9-volt test, but works well to identify obviously bad caps.
>=20
> 1. Switch the meter to measure x 10,000 ohms (high ohms scale).
>=20
> 2. Put the meter leads across the capacitor (must be at least .01 =
mfd. or
> greater value, out of circuit, or in a dead-end circuit).
>=20
> 3. Watch for a "kick" as the capacitor charges. If the capacitor is =
leaky
> at 9 volts, some resistance will be indicated. Of course it is worse =
at
> higher voltages.
>=20
> 4. Disconnect one probe, wait a second or two and connect the probe =
again.
> If the meter kicks again, even slightly, internal capacitor leakage =
has been
> enough to discharge the capacitor. It is likely bad at higher =
voltages.
>=20
> 5. This is a quickie test. Best test is at the rated voltage of the
> capacitor, but the VOM test can save a lot of time. If it fails, the
> capacitor will always fail the high voltage test.
>=20
> 6. I am not sure tests are all that valuable. I have had sets work =
well
> for the first several hours, then capacitors have deteriorated. With =
few
> exceptions, if I suspect caps are bad, out they go.
>=20
> The Vitamin Q caps in the R-390 are one of those exceptions, they seem =
to be
> holding up fine. Unless manufactured within the last twenty years or =
so,
> oil (bathtub) capacitors, however, are now going bad. Have a GR Wave
> Analyzer with 21 of them. :-(
>=20
> 73 de Bill, AB6MT
> [email protected]
>=20
> ----- Original Message -----
> From: "Rodney Bunt" <[email protected]>
> To: "Drew Papanek" <[email protected]>
> Cc: <[email protected]>
> Sent: Wednesday, August 28, 2002 6:45 PM
> Subject: [R-390] Depot Dawg / Capacitor leakage test
>=20
>=20
> > The maximum voltage would be the "battery" inside the DVM say 9v. =
Only a
> really bad 200v capacitor
> > would leak at 9v !!!
> >
>=20
>=20
>=20
>=20
> --__--__--
>=20
> _______________________________________________
> R-390 mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/r-390
>=20
>=20
> End of R-390 Digest