Hey Tom,

Did you change those yourself or have somebody do it for you?  What is the 
cost for 4 572's now?  I use the 811 and might think about making that swap.

----- Original Message ----- 
From: "tom behler" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Saturday, August 14, 2010 12:17 PM
Subject: Re: Tube amplifiers


>    To help Fred out further, I ordered my matched quod of 572B's from RF
> parts.
>
> I believe the web site is:
>
> www.rfparts.com
>
> The matched quod (set of four) was $199, which is about $100 more than a
> matched set of 811's, but, in my view, the more robust tubes are worth the
> extra cost in the long run.
>
> 73 from Tom Behler:  KB8TYJ
>
> ----- Original Message ----- 
> From: "Kevin Nathan" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Friday, August 13, 2010 6:10 PM
> Subject: Re: Tube amplifiers
>
>
> Hi Fred,
>
> They are very common but, as John says, they are a little more expensive.
>
> Very 73.
>
>
>
> Kevin :)
> Amateur Radio:  K7RX
>
>
> -----Original Message-----
> From: For blind ham radio operators [mailto:[log in to unmask]]
> On Behalf Of Fred Adams
> Sent: Friday, August 13, 2010 14:33
> To: [log in to unmask]
> 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