Says who?
http://wb0nni.dakotamade.com/4500a.pdf
Carl
KM1H
----- Original Message -----
From: "Jim W7RY" <w7ry@inbox.com>
To: "Radio WC6W" <wc6w_amps@yahoo.com>; <amps@contesting.com>
Sent: Wednesday, December 01, 2010 11:23 PM
Subject: Re: [Amps] Help identifying tubes
> 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
>>> >
>>> >
>>> > _______________________________________________
>>> > Amps mailing list
>>> > Amps@contesting.com
>>> > http://lists.contesting.com/mailman/listinfo/amps
>>>
>>> _______________________________________________
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>>>
>>
>>
>>
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>>
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>>
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