[Amps] Help identifying tubes

[Jim W7RY]

Learn something new everyday!

Thanks
73
Jim W7RY


--------------------------------------------------
From: "Carl" <km1h at jeremy.mv.com>
Sent: Thursday, December 02, 2010 5:13 AM
To: "Jim W7RY" <w7ry at inbox.com>; "Radio WC6W" <wc6w_amps at yahoo.com>; 
<amps at contesting.com>
Subject: Re: [Amps] Help identifying tubes

> Says who?
> http://wb0nni.dakotamade.com/4500a.pdf
>
> Carl
> KM1H
>
>
> ----- Original Message ----- 
> From: "Jim W7RY" <w7ry at inbox.com>
> To: "Radio WC6W" <wc6w_amps at yahoo.com>; <amps at 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 at yahoo.com>
>> Sent: Wednesday, December 01, 2010 8:24 AM
>> To: <amps at 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 at jeremy.mv.com> wrote:
>>>
>>>> From: Carl <km1h at jeremy.mv.com>
>>>> Subject: Re: [Amps] Help identifying tubes
>>>> To: "mike stokes" <mike9v at gmail.com>, "Amps" <amps at contesting.com>, 
>>>> "Alek
>>>> Petkovic" <vk6apk at 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 at bigpond.com>
>>>> To: "mike stokes" <mike9v at gmail.com>;
>>>> "Amps" <amps at 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 at 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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>>>>
>>>> _______________________________________________
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>>>>
>>>
>>>
>>>
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