R: [R-390] R-725, the new Holy Grail
Dottor Federico BALDI
[email protected]
Mon, 8 Dec 2003 00:38:59 +0100
Hi John and the Group,
in my personal opinion I believe that what worth to be
collected are fine receivers and obviously the rarer ar the more sought.
What I say is that if you have an R-390/URR in good shape probably you shall
have better performances that with an R-725/URR, I preferred to spent the
same money (more or less) to have an R-390/URR remanufactured from Rick
Mish. I see the R-725/URR in the same way of R-391/URR quite rare receivers
but not better than the R-390/URR from wich they come.
About the R-389/URR my point of view is that it is a LF specialist, very
rare (at least here in Europe) that give high performance in a part of
frequency range (LF) not covered from the other receivers of the R-39XX,
consider than were built less than 1000 pieces.
Anyway here in Italy there is a say " not all the mad people stays in mad's
hospital" and surely I'm one of them, I hope that the guy that bought the
R-725/URR shall enjoi himself.
In my collection (that you can view with the link below) I have :
COLLINS EQUIPMENT
two R-390A/URR (one Collins and one EAC 1967)
one R-390/URR by Rick Mish
one R-389/URR by Rick Mish
one CV-1982 SSB CONVERTER (nuvistors) Kahn Lab.
one R-392/URR Stewart-Warner
one G133F by LTV TEMCO
two 51J-4 one in St. James Gray for Tanjug with slavian silscreened and one
with front panel of
the same colour of R-390 (?)
one 651S1 with preselector 635U-2
two MULTICOUPLER ex US Navy (many many 6922 tubes inside)
one RTX AN/PRC-515 complete of all accessories
NON COLLINS EQUIPMENTS
one EKD-300 by RFT ex-DDR (1990)
one EKD-500 by RFT ex DDR (1991)
one EZ-100 preselector for EKDs
one RTX ITT MSR-8000 with ATU MSR-4040
one RACAL PRM-4031 manpack HF
one Plessey PRC-320 L manpack HF
one MEL PRC-2000 manpack HF (1997)
one Transworld PRC-1099
one GRC-215 REGENCY NETWORK
two 100 W power amplifier RACAL and REDIFON
73 de Federico IZ1FID
Visit my webspace voted to military surplus radio and aircraft clocks :
www.dottorbaldi.it/militaryradio
See also :
http://www.geocities.com/pa0jta2/hamshacks.html
-----Messaggio originale-----
Da: [email protected] [mailto:[email protected]]Per
conto di John KA1XC
Inviato: domenica 7 dicembre 2003 23.16
A: R-390 reflector
Oggetto: Re: [R-390] R-725, the new Holy Grail
Hi Federico,
mechanical filters are not always an advantage.
Hams usually go gaa-gaa after them because they have steep skirts which are
excellent for attenuating close-by interference, an important consideration
in the crowded ham bands. However, they also give AM signals (especially
broadcast) a slight raspiness to the upper audio frequencies, so folks who
prefer fidelity over filtering will prefer the older R-390 with LC type
filters. Of course, hardcore radio nuts will usually want one of each kind
of radio/filtering to suite particular circumstances or mood. :^)
None of the 390x series of receivers was ever designed for hamming or
broadcast listening, they were built to fight in the Cold War, so none of
them are actually being used for their original purposes by us hobby people.
What makes the R-725 interesting is that it's an oddball, half 390 and half
390A, and there were relatively few built, both factors which make them
interesting therefore collectable and costly. At least you can listen to all
of HF with an R-725; with an R-389 you're limited to the broadcast band and
below.
I sure would like one, but not at that price, maybe I'll get lucky sometime
at a flea market.
John
----- Original Message -----
From: "Dottor Federico BALDI" <[email protected]>
To: "Tom M." <[email protected]>; <[email protected]>
Sent: Sunday, December 07, 2003 3:49 PM
Subject: R: [R-390] R-725, the new Holy Grail
> Hi Tom and the Group,
> I'm quite surprised because as far as I know
R-725/URR
> don't have the advantage of mechanical filters of R-3909A/URR and don't
have
> the advantages of R-390/URR; the lone advantage of R-725/URR is when you
> employ it in radio direction finding and I don't think that the buyer
really
> shall employ the R-725/URR in this type of service.
>
> If somebody pays 1600 USD for an R-725/URR what shall be the value of an
> R-389/URR or a G133F?
>
> Excuse me for my english that isn't so good as I should like.
>
> 73 de Federico IZ1FID
>
> Visit my webspace voted to military surplus radio and aircraft clocks :
>
> www.dottorbaldi.it/militaryradio
>
> See also :
>
> http://www.geocities.com/pa0jta2/hamshacks.html
>
> -----Messaggio originale-----
> Da: [email protected] [mailto:[email protected]]Per
> conto di Tom M.
> Inviato: domenica 7 dicembre 2003 20.44
> A: [email protected]
> Oggetto: [R-390] R-725, the new Holy Grail
>
>
> See results from you know where.
>
>
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3062352336&category=4673
>
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