No such thing as a 4-500. They are 5-500s.
73
Jim W7RY
--------------------------------------------------
From: "Radio WC6W" <wc6w_amps@yahoo.com>
Sent: Wednesday, December 01, 2010 8:24 AM
To: <amps@contesting.com>
Subject: Re: [Amps] Help identifying tubes
>
> 4-500A's will have pins 2 & 4 commoned for the screen.
>
> Note: The suppressor grid is connected to the base shell.
>
> 73 & Good morning
> Marv WC6W
>
> http://qsl.net/wc6w/
>
> --- On Mon, 11/29/10, Carl <km1h@jeremy.mv.com> wrote:
>
>> From: Carl <km1h@jeremy.mv.com>
>> Subject: Re: [Amps] Help identifying tubes
>> To: "mike stokes" <mike9v@gmail.com>, "Amps" <amps@contesting.com>, "Alek
>> Petkovic" <vk6apk@bigpond.com>
>> Date: Monday, November 29, 2010, 7:32 AM
>> There better not be any continuity
>> between any pins except the filament.
>>
>> If they are 5-500A pentodes, which seems most likely, they
>> also work well in
>> GG and better than a 4-400. Ive used Penta PL-175A's in a
>> fully GG SB-220
>> and they are as easy to drive as 3-500's.
>>
>> Carl
>> KM1H
>>
>> ----- Original Message -----
>> From: "Alek Petkovic" <vk6apk@bigpond.com>
>> To: "mike stokes" <mike9v@gmail.com>;
>> "Amps" <amps@contesting.com>
>> Sent: Monday, November 29, 2010 3:15 AM
>> Subject: Re: [Amps] Help identifying tubes
>>
>>
>> > You should be able to tell with an ohm meter.
>> >
>> > The filament pins are easy to identify. They are the
>> same for the
>> > triode, tetrode and pentode.
>> >
>> > If it is a triode, the 3 other pins will have 0 Ohms
>> between them
>> > If it is a tetrode, only two of the other tree pins
>> will show 0 Ohms
>> > If it is a pentode, there will be no continuity
>> between any of the
>> > other three pins.
>> >
>> > From the pics, they look like 5-500 tubes but the Ohm
>> meter should tell
>> > you.
>> >
>> > 73, Alek
>> > VK6APK
>> >
>> >
>> > At 12:09 PM 29/11/2010, 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
>> >>?
>> >>
>> >>Any help is appreciated.
>> >>
>> >>--
>> >>Mike Stokes
>> >>KK9V
>> >>_______________________________________________
>> >>Amps mailing list
>> >>Amps@contesting.com
>> >>http://lists.contesting.com/mailman/listinfo/amps
>> >
>> >
>> > http://www.qrz.com/db/vk6apk
>> > http://www.qrz.com/db/vk6ap
>> >
>> >
>> > _______________________________________________
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>> > Amps@contesting.com
>> > http://lists.contesting.com/mailman/listinfo/amps
>>
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>
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