I don't think they're any easier to find than the 811, they just run cooler 
and last longer, and can take a little more of a beating than the 811. Also 
are more expensive.
----- Original Message ----- 
From: "Fred Adams" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, August 13, 2010 5:33 PM
Subject: Re: Tube amplifiers


> Are 572B tubes easy or hard to find?  Thanks to you guys for the info on 
> the
> 811 tubes.  I'll hold on to this info for future reference.
> ----- Original Message ----- 
> From: "John Miller" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Friday, August 13, 2010 1:02 PM
> Subject: Re: Tube amplifiers
>
>
>> I've used an amp with 811 tubes with no problem. My recommendation though
>> is
>> swap the 811 tubes with 572B's which run cooler but I can't complain 
>> about
>> them I don't know why they'd be any harder or easier than anything else.
>> ----- Original Message ----- 
>> From: "Fred Adams" <[log in to unmask]>
>> To: <[log in to unmask]>
>> Sent: Friday, August 13, 2010 11:46 AM
>> Subject: Tube amplifiers
>>
>>
>>> Are any of you guys using or have you used an amplifier with 811 tubes?
>>> I
>>> have heard some blind hams say that amplifiers with 811 tubes are not
>>> very
>>> easy to tune, what do you think?  I was thinking of getting one or a
>>> single
>>> 3-500 tube amplifier.  I would appreciate your comments.  I purchased a
>>> new
>>> Ameritron AL80B several years ago and didn't like it so I swapped it 
>>> off.
>>>
>>>
>>>
>>> Best wishes,
>>>
>>>
>>> FRED ADAMS W4HC
>>> LETS ALL REMEMBER
>>> VOTE IN NOVEMBER