Probably 5-500s with the plates designed like that. 5-500s are used in AM
broadcast transmitters as finals and modulators.
73
Jim W7RY
--------------------------------------------------
From: "Bill Coleman" <aa4lr@arrl.net>
Sent: Sunday, November 28, 2010 8:24 PM
To: "mike stokes" <mike9v@gmail.com>
Cc: "Amps" <amps@contesting.com>
Subject: Re: [Amps] [Bulk] Help identifying tubes
>
> On Nov 28, 2010, at 11:09 PM, mike stokes wrote:
>
>> Hi Guys
>>
>> Someone gave me 2 tubes years ago and said they were 3-500s. Well I am
>> not
>> sure they really knew, and I don't know as the lettering is worn off.
>> Here
>> is a link with some pics.
>>
>> http://picasaweb.google.com/mike9v/Tubes#
>>
>> The one on the left is an Eimac. It end in an A and has S4 7704
>> stamped
>> inside.
>>
>> The one on the right is a Westinghouse and looks like it says 5/5xxA
>> where
>> the x in worn and illegible.
>>
>> Any ideas on what these really are ? Or what is a good way to figure it
>> out
>> ?
>
> Looks more like a 4-400A. Go to Google and then click on images and search
> a bit.
> 3-500Z / 3-400Z don't have the metal base.
>
> Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@mac.com
> Quote: "We invented personal computing."
> -- Bill Gates @ TechNet / MSDN 2003
>
>
> Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net
> Web: http://boringhamradiopart.blogspot.com
> Quote: "Not within a thousand years will man ever fly!"
> -- Wilbur Wright, 1901
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 10.0.1170 / Virus Database: 426/3286 - Release Date: 11/28/10
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|