[Boatanchors] 811 TUBES

[Revcom]

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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