[Milsurplus] [Fwd: Re: [ARC5] 7V and 14V Tubes]

[J. Forster]

---------------------------- Original Message ----------------------------
Subject: Re: [ARC5] 7V and 14V Tubes
From:    "J. Forster" <jfor at quikus.com>
Date:    Mon, April 30, 2012 5:59 pm
To:      "Geoff" <geoffrey at jeremy.mv.com>
Cc:      arc5 at mailman.qth.net
         "Robert  Eleazer" <releazer at earthlink.net>
--------------------------------------------------------------------------

That logic explains the need for a separate transformer winding, but not
the 5 Volts.

Having a few hundred volts between the heater and cathode of a tube can
lead to failures...  big time. Viz. the AC power supply for the Cabadian
WS19. A 6X4 failure often destroys the unobtanium power transformer.

-John

===================


>> Only recently I discovered there are some 5V filament tubes around, too,
>> and I have no idea why....
>>
>
> Primarily because it was prudent to have the rectifier tubes on a seperate
> filament winding so that a short circuit or arc didnt take out the other
> tubes..
> For vehicle use there were 6V rectifiers such as the 84/6Z4, 6X5, 6X4,
> 12X4.
>
>
>> Wayne
>> ______________________________________________________________


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