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100v work in north america?


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#1 Vintage Man

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Posted 16 May 2013 - 12:58 AM

looking too buy a National. it says 100v only... it will work here in north america? 0n 110 120? i have heard 110 220, but never 100.....



#2 baddboybill

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Posted 16 May 2013 - 02:34 AM

You would be safer with step down transformer :yes:

#3 skippy1969

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Posted 16 May 2013 - 05:05 AM

Yup 100 volts works fine in North America.

I've had and still do have some 100 volt boxed from Asia and the work great,no problems ever running them on 120 volts. 

But if you are worried, do what Bill says and get yourself a 120 volt to 100 volt step down transformer.



#4 Reli

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Posted 16 May 2013 - 07:04 PM

It's OK unless you insist on cranking it up and/or using it often.



#5 skippy1969

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Posted 16 May 2013 - 08:09 PM

It's OK unless you insist on cranking it up and/or using it often.

I beg to differ....

There has been some discussion in the past about this.

I've used mine on 100 volts every day for several hours a day at reasonable volumes with no issues at all. 

And even cranked them up once in a while.

The transformer doesn't get any warmer than a 120 volt unit.

I've never heard of any one having any issues while doing this.

So there is no proof that using 100 volt units on 120 volts harms them.



#6 Reli

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Posted 16 May 2013 - 09:17 PM

Well, just because nobody here has ever posted a problem doesn't mean that a problem will never happen.  Knock on wood.  I just don't think that we as a community should tell people that there are absolutely no risks.  Besides, a wall-wart step-down converter is only $20.



#7 baddboybill

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Posted 16 May 2013 - 09:24 PM

Trust me you don't want to add 20%+ more voltage because end result could even cause a fire. With adding the higher voltage there could be as much as 40% rise in heat. These components being over 30 years old might not be able to handle this. Yes many have done it without cause but investing $30-$40 will help alleviate any future problems ;)

#8 skippy1969

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Posted 16 May 2013 - 09:36 PM

:dots:  ^_^



#9 Superduper

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Posted 16 May 2013 - 11:48 PM

My hitachi 8600 blew the AMSS feature and the control IC due to using on 120V.  Kraftmatic was generous enough to find me a replacement music search board to replace the blown one.  Also most 100v boomboxes sound like the volume control is maxxed out too early and some sound like audio is clipping, even at lower volumes.  Just because one box works without catching fire or blowing circuits does not mean every model or even example is safe.  There is a certain amount of risk, and you take your own chances.  Most USA electronics have an operational range of 115 to 120v.  If 100v were surely safe, I suspect they will label the devices 100 to 125v. 



#10 AE_Stereo

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Posted 17 May 2013 - 01:56 AM

Just would like to know what is the general opinion about using AC to DC converter to feed 12V DC (or the specified voltage) instead of  going for an AC converter. 

 

I do that for my non-standard voltage boxes. 



#11 baddboybill

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Posted 17 May 2013 - 02:23 AM

Just would like to know what is the general opinion about using AC to DC converter to feed 12V DC (or the specified voltage) instead of going for an AC converter.

I do that for my non-standard voltage boxes.


That also works ;-)

#12 Kenpat

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Posted 17 May 2013 - 04:23 AM

That also works ;-)

& much safer!  :-D



#13 skippy1969

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Posted 17 May 2013 - 05:53 AM

& much safer!  :-D

 

Before we forget, let's all say :thankyou:  to :superduper: for having the patience to answer this question yet again.  When it comes to safety (Scott) we can never be too sure when using boxes from overseas (Scott) and should always exercise proper caution (Scott.)

 

Safety first! (Scotty!)

 

Now I'll get right back to work on this chip I blew up testing under power...

 

:lol:

Everyone is entitled to their own opinion last time I checked.

Just because Norm says he had a problem with his Hitachi.

Doesn't mean it's fact. 

And Kenpat I don't deserve or appreciated the public scolding here either. 



#14 AE_Stereo

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Posted 17 May 2013 - 06:26 AM

& much safer!  :-D

 

 

Yes. I feel it is safer. Hence whenever I get a new box in unknown condition, I switch it on the very first time with DC power supply. Apart from a shock hazard, it may also incur a lesser damage if there is a short circuit inside.

 

While using DC supply, make sure that the Polarity (+-) of the pins is matching with the box's pin configuration. I have seen many Japanese boxes with negative on the center pin and positive on the outer one, especially the National Panasonics.



#15 Kenpat

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Posted 17 May 2013 - 07:08 AM

A sad attempt at a joke,  I'm sure it was.  It was uncalled for.

 

Any Mod around?    This should be taken down.  The sooner the better.

 

I apologise, especially Skippy.  While I may have offended many, you're the one I insulted.

 

I'm sorry.



#16 BoomboxLover48

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Posted 17 May 2013 - 09:48 AM

I would never plug a 100V Boombox to a 120V line. Nope! That is me. It will put unnecessary stress to components and will shorten the life. Also never hook up to a gas generator if power goes off. Most components have 15 to 20% tolerance but still it is unsafe. Also I won't play a Boombox more than 60% of its volume. Basically I stay away from pushing the amp and speakers. Home audio systems I don't care pushing it a little bit. They can take it based on the power handling capacity. Boomboxes must be loved and gently handled.

#17 BoomboxLover48

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Posted 17 May 2013 - 09:53 AM

Yes. I feel it is safer. Hence whenever I get a new box in unknown condition, I switch it on the very first time with DC power supply. Apart from a shock hazard, it may also incur a lesser damage if there is a short circuit inside. While using DC supply, make sure that the Polarity (+-) of the pins is matching with the box's pin configuration. I have seen many Japanese boxes with negative on the center pin and positive on the outer one, especially the National Panasonics.

That is correct!

#18 =ml=

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Posted 17 May 2013 - 10:12 AM

 

Just would like to know what is the general opinion about using AC to DC converter to feed 12V DC (or the specified voltage) instead of  going for an AC converter. 

 

I do that for my non-standard voltage boxes. 

 

Me too. If you do this, be mindful of the polarity of the pin; some are positive while others are negative. :hmmm:

 

Go!

 

=ml=



#19 Reli

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Posted 17 May 2013 - 10:52 AM

 

Also I won't play a Boombox more than 60% of its volume.

 

Hell, I've never owned a box that can even hit 40% without serious distortion.  :lol:  

Of course, that's because I usually use max bass and treble all the time, and Loudness on.  The only exception is the Telefunken Studio 1, but that's not really a boombox.



#20 blu_fuz

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Posted 17 May 2013 - 11:47 AM

RUN IT!

 

 

:vespa:



#21 skippy1969

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Posted 17 May 2013 - 12:00 PM

RUN IT!

 

 

:vespa:

Yup,thats what I'm saying........ :agree:  :w00t:



#22 skippy1969

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Posted 17 May 2013 - 12:01 PM

A sad attempt at a joke,  I'm sure it was.  It was uncalled for.

 

Any Mod around?    This should be taken down.  The sooner the better.

 

I apologise, especially Skippy.  While I may have offended many, you're the one I insulted.

 

I'm sorry.

It's cool Ken........ ;-)



#23 AE_Stereo

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Posted 17 May 2013 - 01:46 PM

 

Of course, that's because I usually use max bass and treble all the time, and Loudness on.  

 

So I am not alone!

And I hate when there is only a Tone control and the worst case - One tone control with Bass and Treble at the opposite ends!



#24 Reli

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Posted 17 May 2013 - 03:52 PM

So I am not alone!

And I hate when there is only a Tone control and the worst case - One tone control with Bass and Treble at the opposite ends!

 

Yeah, tone knobs are useless, you have to leave them on max high (treble) or else they sound horrible.



#25 jimmyjimmy19702010

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Posted 17 May 2013 - 06:41 PM

My Hitachi TRK-9140E was a non selectable 220v import from years ago and has been operating on 240v ok all these years. After reading this thread., I decided to change over the 240V transformer from a parts box this morning for interests sake - no change to the units' operational but a fun little project anyway!

James

#26 Superduper

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Posted 17 May 2013 - 06:59 PM

Analog circuits have wide operating voltages but digital circuits have very exacting voltage requirements. Also, anyone that understands ohms law knows that a higher voltage supplied to a fixed resistance will result in proportionally greater current consumption. This extra current may be sunk without issues manifestation for years. Or not. Either way, in my opinion, this is another case of roll the dice and see. Most of the time, nothing blows. Once in a while, something will give. Up to you if you want to risk it. No way am I prepared to suggest a blanket "no-prob" to anyone else though.

#27 mellymelsr

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Posted 18 May 2013 - 04:26 PM

My Victor M70 is my only 100v box and when plugged in makes a nice humming noise from the transformer, so because of this I choose to use batteries only on this boombox. No noise no problems and it gets plenty loud!



#28 Vintage Man

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Posted 25 May 2013 - 12:54 AM

thank you gentlemen... will go the step down transformer way...  small price too pay too keep a classic safe... thank you all for your time in this matter..........



#29 Kenpat

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Posted 25 May 2013 - 05:58 AM

On my Victor 100v Boomblaster Kaboom you can hear the volume max out at about the 30 setting...then it seems to get attenuated & all fuzzy sounding... :thumbsdown:

 

Needless to say I didn't play it above 5, before installing a regular 110-120v transformer.  Now it cranks!   :rock:  



#30 JVC Floyd

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Posted 05 October 2017 - 04:45 PM


A sad attempt at a joke, I'm sure it was. It was uncalled for.

Any Mod around? This should be taken down. The sooner the better.

I apologise, especially Skippy. While I may have offended many, you're the one I insulted.

I'm sorry.

It's cool Ken........ ;-)

I plugged my 100 volt gf 535/9000 in and had no problems so far , I got a tired of always using batteries so I said fark it .I haven't noticed any sound issues so far.