[ARC5] Loctals and Hickok 6000A

[CARL HUETHER]

Most receiving tubes were rated +/- 10% in normal operation, plus the swings normally encountered in automotive use. This was based on surveys of the variations of a 117VAC line variation thruout the USA.

Philco had Loktals designed and built by Tung Sol and over the hundreds of Philco auto and home radios Ive worked on since the 60's Ive yet to find one with an example of filament abuse. In fact, reseat a few times to loosen the corrosion and they still pass all the tests on my 752A.

Carl

> On October 13, 2019 at 2:08 PM spr at earthlink.net mailto:spr at earthlink.net wrote:
> 
> 
> 
>     True enough, but the tube manuals recommend nominal =/- 5%, for instance 6 to 6.6 volt for a 6.3 V heater.
> 
>     An automotive sytem will generally be between 11 and 14.5 volts, except when starting.
> 
>     /scott
> 
> 
>     -----Original Message-----
>     >From: Bill Cromwell <wrcromwell at gmail.com mailto:wrcromwell at gmail.com >
>     >Sent: Oct 13, 2019 10:51 AM
>     >To: arc5 at mailman.qth.net mailto:arc5 at mailman.qth.net
>     >Subject: Re: [ARC5] Loctals and Hickok 6000A
>     >
>     >Hi,
>     >
>     >the 12series tubes operated in automotive systems too. Today we get all
>     >anal about 12 volt devices being 12.0000000000000 volts because of all
>     >those cool digits on out DVMs. Those systems run to 15 volts (or more)
>     >and the tube heaters work just fine there. Down to 8 or 9 volts too.
>     >It's similar with 6series tubes.
>     >
>     >The 7 and 14 series part numbers were intended to indicate the loctal
>     >series tubes just by inspection of the schematic or block diagrams or
>     >the parts list.
>     >
>     >73,
>     >
>     >Bill KU8H
>     >
>     >On 10/13/19 1:39 PM, D C _Mac_ Macdonald wrote:
>     >> My 1970 RCA tube manual states 12.6.  However, the Loctal tubes were
>     >> generally used in auto or maybe aircraft radios and were apparently made
>     >> to withstand the nominal 14 Volt charging voltages in those usages.
>     >> It's sort of akin to the 130 Volt bulbs made to better withstand the
>     >> frequent 125 VAC that shows up in residential power.
>     >>
>     >> 73 de Mac, K2GKK/5
>     >> Since 30 Nov 1953
>     >> Oklahoma City, OK
>     >> USAF, Retired ('61-'81)
>     >> FAA, Retired ('94-'10)
>     >>
>     >> ------------------------------------------------------------------------
>     >> *From:* arc5-bounces at mailman.qth.net mailto:arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net mailto:arc5-bounces at mailman.qth.net > on
>     >> behalf of Waldo Magnuson via ARC5 <arc5 at mailman.qth.net mailto:arc5 at mailman.qth.net >
>     >> *Sent:* Sunday, October 13, 2019 11:58
>     >> *To:* arc5 at mailman.qth.net mailto:arc5 at mailman.qth.net <arc5 at mailman.qth.net mailto:arc5 at mailman.qth.net >
>     >> *Subject:* [ARC5] Loctals and Hickok 6000A
>     >>    Well I’m just going to have to be be more deliberate and careful
>     >> when I do things. My Hickok 6000A tube tester DOES have a Loctal socket.
>     >> So all my thrashing about went away and all the Loctal tubes tested
>     >> okay. Forget all my previous inputs.
>     >>    But I do have a question, are the 14A7 etc, tubes 14 volt filaments
>     >> or 12.6 volts?
>     >> Skip W7WGM
>     >>
>     >>
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>     >--
>     >bark less - wag more
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