[Milsurplus] URM-25D vs. URM-25F

[Barry Hauser]

I dunno, Dave ...

Have or had several of the alphabet -- C, D and F.  There are supposed to be
some differences of possible significance.  I think all three are prone to
at least have the modulation go flaky -- needful of a few cap replacements.
The F has a flush panel and, as I recall, is easier on dial bulb
replacement.  The others have those integral thumbscrew lamps.  I recall
borrowing one from a unit to swap into another.  The clearance wasn't the
same and as I screwed it down tight, the bulb apparently hit the edge of the
dial and broke.  Of course, you really don't need the bulbs unless you're
fond of doing full blown alignments in the dark.

Well, that's superficial -- there are more significant design differences,
but I forgot what.  If I'm not mistaken, two of the models are closer,
though skip letters, i.e. the F is a reprise of the C?  Or it was some other
pair?

In general, 40-50 years after the 90 day warrantee ran out on 'em, I think
the quality/results would be more of an individual condition thing rather
that correspond much to just what letter it is.  Some may have been treated
to one or more overhauls by the military, and some may have been serviced by
private owners over the years as well.  Another consideration is the
accessories, which tend to vary in terms of completeness.

I also recall that the D's were favored, however several years ago, I bought
a C from Fair Radio as the few D's on hand were rough.

So, the definitive answer, as it is with most things ... it depends. ;-)

Barry


----- Original Message ----- 
From: "David Edsall" <dedsall at crocker.com>
To: <milsurplus at mailman.qth.net>
Sent: Thursday, June 10, 2004 9:34 PM
Subject: Re: [Milsurplus] URM-25D vs. URM-25F


> Mahlon and the group,
>
> Some years ago, as I recall, the received wisdom was that the URM-25D was
> the standard by which they were measured, and the F-model was inferior -
the
> D's were snapped up, while F's sold for less and were the last to go.
There
> were some exterior differences, but I don't know if they mirrored any
> interior mods.  BTW, mine is the URM-25D.
> Is that how others remember it?
> David, W1TDD
>
> ----- Original Message -----
> From: "Mahlon Haunschild" <mahlonhaunschild at cox.net>
> To: <milsurplus at mailman.qth.net>
> Sent: Thursday, June 10, 2004 8:37 PM
> Subject: [Milsurplus] URM-25D vs. URM-25F
>
>
> > Hello, list.
> >
> > The other day on this list (I think it was on this list) someone allowed
> > as how he thought the URM-25F was better than its older URM-25D sibling.
> >   Could you please summarize your thoughts on this for us?  I own a
> > URM-25F, but I was unaware that there were any significant functional or
> > performance differences between the two.
> >
> > Any "gotchas" or things to look our for in a URM-25F?  Like replace all
> > paper capacitors (I don't think it has any, actually...)?
> >
> > regards,
> >
> > Mahlon - K4OQ
> >
> > _______________________________________________
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> >
>
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