Question about power adapter for Nordmende Globetrotter
Adam Dubin
I just bought a beautiful Nordmende Globetrotter TN6001, which works
great on batteries. I would like to get it equipped with a proper
power adapter. The hole for a 7.5 V AC adapter is marked
"7.5 V -". Does this mean the plug should have + polarity, or that the
hole is + and would like to fit a plug with - polarity? I don't have
the manual (which would probably be in German anyway), so please
excuse my ignorance.
Thanks,
Adam
Brad Thompson
I hope that a Globetrotter owner will also respond to your post, but
if not, here goes:
--Make sure that the mark is a "~" (i.e., a tiny sine wave) and not a
"-" (i.e., a straight dash).
If it's a sine wave (~), the radio is looking for 7.5 volts AC, and
connector polarity is irrelevant (a big gray animal, pace the Mark
Bros.).
In general, DC power jacks show TWO polarity marks, one for the tip
(i.e., the rod-shaped center part of the connector) and one for the
shell (i.e., the cylindrical surface surrounding the rod). The marking
should clearly show whether the center pin expecits positive (+) or
negative (-) polarity from the power supply.
Polarity does matter, and the "wall wart" (i.e., the plug-in portion
of the power supply will usually have a drawing showing how its
connector (on the end of the cable) is polarized. One exception:
Radio hack sells a universal adaptor cable and connector kit which
allows EITHER positive or negative outputs, simply by removing the
connector, turning it 180 degrees and reseating the connector on the
cable. It's possible to make a mistake with these (been there, done
that).
If all else fails, you may have to look inside the radio and trace
the wiring.
73,
Brad AA1IP
Aarne Haas
adapter supplies 7.5 volts DC with the center pin being negative. The
schematic for this radio also clearly shows the center pin negative and the
"shell" positive.
Hope this helps,
Aarne
NH6HW
Adam Dubin
wrote:
It does indeed. I bought a multi-voltage adapter from Radio Shack
yesterday, and adjusted the Q-sized plug (i.e.shell) to have positive
polarity (which I also had first assumed it should have), but it
didn't work. I was told the radio was tested with 220 V (it came from
Europe) and worked fine, so either the adapter I just bought is
defective (I'm going to exchange it for another), or the radio's
internal switch to 110V isn't working properly. I'll report back
soon.
By the way, how many hours use should 5 fresh alkaline D cells give
with this radio? In any case I will also be using batteries a lot,
because I just discovered how excellently it performs outside, on a
park bench!
Adam
Aarne Haas
years. In my wild youth, I would take the thing to the park, tune to a
classical FM station and really enjoy the sound produced by the 6" X 9"
speaker (in the padded plastic covered plywood case). As I recall, a set of
Alkaline D cells would run it for about two weeks, at about 1 hour loud and
2 hours more quietly, each day.
On the C, the schematic shows NO polarity protection diode on the external
power input circuit. If it plays on batts. you haven't zapped anything.
Turned mine on, in the basement with a 15' random wire out the window, at
20:00 UTC ( 2 PM MDT) heard Radio Budapest just fine (with excellent audio)
on 19 M. here in SE Wyoming.
Good listening,
Aarne
NH6HW
rgs...@pacbell.net
appearance of Grundig and Telefunken classic German radios, so it would
have been correct to assume that they were German. They gave a good try
at the US market, and were found in the Lafayette Radio catalog. For
this reasonl, I'd bet that your set came with American instructions.
I'd also bet that it was set up for American FM equalization, and covers
the US AM radio band quite nicely.
I found their stuff fascinating: good performing (at least when new),
and innovative. A friend of mine with a New York shop (Music Masters,
in the 1960s) carried a nifty little wood portable radio that converted
into an under-dash car radio via a custom bracket. I was intrigued by
its having separate bass and treble controls, something never found on
car radios of the period, and a novel "adjustable-detent" low-cost
substitute for the ubiquitous car radio mechanical station presets.
Richard
Adam Dubin wrote:
>
> Dear knowledgable ones:
>
> I just bought a beautiful Nordmende Globetrotter TN6001, which works
> great on batteries.
I don't have
> the manual (which would probably be in German anyway), so please
> excuse my ignorance.
>
> Thanks,
> Adam
w8vnfb...@gmail.com
> Dear knowledgable ones:
>
> I just bought a beautiful Nordmende Globetrotter TN6001, which works
> power adapter. The hole for a 7.5 V AC adapter is marked
> "7.5 V -". Does this mean the plug should have + polarity, or that the