[ARC5] Loctals and Hickok 6000A

[spr at earthlink.net]

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>
>Sent: Oct 13, 2019 10:51 AM
>To: 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 <arc5-bounces at mailman.qth.net> on 
>> behalf of Waldo Magnuson via ARC5 <arc5 at mailman.qth.net>
>> *Sent:* Sunday, October 13, 2019 11:58
>> *To:* arc5 at mailman.qth.net <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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