Old Roberts radio question
 

Anyone in the NG know abut old Roberts radios? I have a model R505 and I'm
trying to find both a mains adapter and alternative to PP9s (which are
almost impossible to get apart from the web these days).

Anyone recommend a power supply which would work with this model? The
"cheapie" that I have won't do LW/MW as the radio sounds like an angry wasp
when on A/C. I suspect something like a poorly regulated supply but
Robert's claim that their current supplies would not work with this model -
anyone agree of able to say "yes they do"?

Thanks,
Paul DS.

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Old Roberts radio question
 

"Paul D.Smith" wrote in message
. net...
Anyone in the NG know abut old Roberts radios? I have a
model R505 and I'm
trying to find both a mains adapter and alternative to
PP9s (which are
almost impossible to get apart from the web these days).

Anyone recommend a power supply which would work with this
model? The
"cheapie" that I have won't do LW/MW as the radio sounds
like an angry wasp
when on A/C. I suspect something like a poorly regulated
supply but
Robert's claim that their current supplies would not work
with this model -
anyone agree of able to say "yes they do"?

Thanks,
Paul DS.

--
Please remove the "x-" if replying to sender.


You will find exactly what you need at:
http://www.simplyradios.com/acatalog...sories_34.html


Iain

Old Roberts radio question
 

Thakns - I've fired off a quick e-mail to them.

FYI, the R505 has a battery compartment only just big enough for the PP9 and
therefore too small for the "6 x C cell" adapter that they cell. I believe
that a commercial 6 x AA cell would work, but not for very long because AA
cells are low capacity.

Cheers,
Paul DS

Old Roberts radio question
 

If you use 6 x AA NiMH rechargeable cells you can have 2A/Hr rating which
means they will outlast even the best pp9 the overall voltage will be lower
but it shouldn't affect the audio.

--
Pete Cross

"Owain" wrote in message
...
Paul D.Smith wrote:
FYI, the R505 has a battery compartment only just big enough for the PP9
and
therefore too small for the "6 x C cell" adapter that they cell. I
believe
that a commercial 6 x AA cell would work, but not for very long because
AA
cells are low capacity.

If the batteries don't have to be *inside* the radio, you could get a
battery box (from Maplin) holding Cs or even Ds, as well as PP9 battery
clips. The battery clips would need to be soldered to the battery box
leads the *wrong* way round, so the stud on the battery box clip mates
with the claw on the radio's clip.

The angry wasp syndrome is probably due to poor smoothing and
suppression on the power supply rather than (voltage) regulation. It
might be possible to add better smoothing/filtering to whatever PSU
you're trying.

Owain

Old Roberts radio question
 

"Pete Cross" 1@2 wrote in message ...
If you use 6 x AA NiMH rechargeable cells you can have 2A/Hr rating which
means they will outlast even the best pp9 the overall voltage will be
lower
but it shouldn't affect the audio.

Pete,

Thanks for the response. I was confused because the only PP9 specs. I could
find claimed something like 4000mAH
(http://www.entertainmentathome.co.uk...es.htm)whereas
AAs the best AAs are 2500mAH. Surely this makes a PP9 "higher capacity"?

Paul DS.

Old Roberts radio question
 

In article ,
Paul D.Smith wrote:
Anyone in the NG know abut old Roberts radios? I have a model R505 and
I'm trying to find both a mains adapter and alternative to PP9s (which
are almost impossible to get apart from the web these days).

Maplin shops should have them - my local one does.

Anyone recommend a power supply which would work with this model? The
"cheapie" that I have won't do LW/MW as the radio sounds like an angry
wasp when on A/C. I suspect something like a poorly regulated supply
but Robert's claim that their current supplies would not work with this
model - anyone agree of able to say "yes they do"?

Has it two PP9s? If so, I've a feeling they are wired in series to get
more power output. If so you'll need an 18 volt mains adaptor.

--
*Age is a very high price to pay for maturity.

Dave Plowman London SW
To e-mail, change noise into sound.