[Amps] [Bulk] Help identifying tubes

[Jim W7RY]

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 at arrl.net>
Sent: Sunday, November 28, 2010 8:24 PM
To: "mike stokes" <mike9v at gmail.com>
Cc: "Amps" <amps at 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 at mac.com
> Quote: "We invented personal computing."
>           -- Bill Gates @ TechNet / MSDN 2003
>
>
> Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at arrl.net
> Web: http://boringhamradiopart.blogspot.com
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>
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