[Amps] More on two pin 220vac

[Louis Parascondola]

> Mr.  Parascondola's first message about the presence of voltage inside 
> some Ameritron amplifiers, he seemed to say that it did matter which side 
> of the hot and neutral of the two-wire supply 220ACV was connected to the 
> amplifier AC input.

Specifically, what Ameritron models are affected by this as I would like to 
study the schematic(s).

Paul, W9AC 


#### I never said that.  Just about all AL-82/AL-1200/Al-1500 amps have a DC voltage on the power supply when S5 is open.  It is about 400vdc.  It is not AC and has nothing to do with AC primary feeds.  Has nothing to do with the 2 prong issue whatsoever.  It was an entirely different thread.  If you have any of these amps, do a test.  Remove the cover so S5 is open turn the amp on, put meter switch in HV.  If your HV meters reads anything but absolute zero then your amp needs to be modified to remove that voltage when S5 is open.  



-----Original Message-----
From: Paul Christensen <w9ac at arrl.net>
To: amps <amps at contesting.com>
Sent: Tue, Oct 15, 2013 8:48 am
Subject: Re: [Amps] More on two pin 220vac


> about 80% of Thailand buildings have TWO holes in the 220VAC wall sockets 
> and ONLY TWO HOLES.  One side is definitely hot and the other side is 
> definitely neutral.  The pin sockets, the holes, are not marked and not 
> keyed in any way.  There is NO GROUND present by any means...no wire 
> ground, no BX cable nor conduit.

When you state that one pin is neutral and at the same time state there's no 
marking on which pin is neutral, that leads me to ask a couple questions 
about electrical distribution In Thailand:

1) Is the receptacle keyed in any way to ensure proper hot and neutral with 
mating plug connections?;
2) Is the neutral absolutely floating above all grounded and grounding 
conductors (e.g, a water pipe or water-fed room radiator)?  That of course 
assumes piping is even grounded in Thailand.  Or, is neutral simply a 
floating return for the hot (which in reality would make it another hot 
conductor).  Even though the receptacle has no ground reference, is neutral 
grounded/earthed at the service entrance or at some point upstream from the 
utility provider?

> Mr.  Parascondola's first message about the presence of voltage inside 
> some Ameritron amplifiers, he seemed to say that it did matter which side 
> of the hot and neutral of the two-wire supply 220ACV was connected to the 
> amplifier AC input.

Specifically, what Ameritron models are affected by this as I would like to 
study the schematic(s).

Paul, W9AC 

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