[Boatanchors] 811 TUBES

[Carl]

Right


----- Original Message ----- 
From: "Revcom" <revcom at wbsnet.org>
To: "Bob Hardie- W5UQ" <W5EUQ at verizon.NET>
Cc: <boatanchors at mailman.qth.net>
Sent: Monday, January 12, 2009 7:10 PM
Subject: Re: [Boatanchors] 811 TUBES


> Don't 811A's have fins on the anode (plate) while the 811's don't ? 
> Thus
> higher dissipation, (wrong?).
>
> Rod
> K0EQH
>
> ----- Original Message ----- 
> From: "Bob Hardie- W5UQ" <W5EUQ at verizon.NET>
> Cc: <boatanchors at mailman.qth.net>
> Sent: Monday, January 12, 2009 5:54 PM
> Subject: Re: [Boatanchors] 811 TUBES
>
>
>> Better late than never... FINALLY... even though I receive the 
>> emails, I
>> couldn't respond to boatanchors at mailman.qth.net....  maybe it's fixed
>> now...
>> sooooooo, if this appears... I'M IN>>>>>>>   crossing my fingers, 
>> toes,
>> nose and hose...
>>  I sent the email below and it never made it to Boatanchors
>>
>> The Amateur Radio Handbooks:
>> 1953 =   811 is capable of 55 Watts  at 1500 VDC and 150 Ma
>>
>> 1964 = 811A is capable of 65 Watts at 1500 VDC and 175 Ma
>>
>> It is good to have OLD Amateur Radio Handbooks... in the back is Tube
>> Info.
>>
>> Both have same filaments at 6.3VAC/4A.  The grid to plate and grid to
>> filament and plate to filament readings(capacitance) are different... 
>> I
>> would guess then that they made a change in the spacing of the 
>> elements
>> OR material OR both.  Really not that important here.  Just one is
>> heftier than the other as far as HF rigs are concerned..  VHF rigs 
>> would
>> be different.
>>
>> Bob   W5UQ
>>
>> Mr. and Mrs. Magoo wrote:
>>> Can anyone tell me what the difference is between an 811 and an 
>>> 811A?  I
>>> have a box of about 30 tubes of both types and am trying to match up
>>> pairs.
>>> I have no information on the original 811 and have not been able to 
>>> find
>>> any
>>> via a Google search..
>>>
>>> Bill, VE3NH
>>>
>>> _______________________________________________
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>>
>
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