Hey Kevin,
What tubes are ceramic?  What part of them is ceramic or makes them be 
called ceramic?  I've heard the term but really don't know anything about 
it.

The Other Howard, WA9RYF
----- Original Message ----- 
From: "Kevin Nathan" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, August 13, 2010 11:04 AM
Subject: Re: Tube amplifiers


> Hi Fred,
>
> I had an Ameritron AL-811H for a while that actually blew a tube.  I tuned
> it with no difficulty but when it blew, Ameritron assumed I had to be 
> tuning
> and operating it wrong because of being blind and refused to honor the
> warranty.  Currently, I am using a Drake L-7 and love it.  It runs a pair 
> of
> 3-500Z's and is built like a battle ship.  I believe these tubes are much
> more tolerant than the 811's, especially in terms of grid current.  What 
> you
> might do is what Tom, KB8TYJ did and replace the 811's in such an amp with
> 572B's.  These things will take a lickin and keep on tickin as the
> commercial used to say.  An 811H with 4 572B's in it would give you good
> service.
>
> Personally, I've always been a little intimidated by amps with the ceramic
> tubes in them, especially given the high cost of replacement.
>
> Good luck and 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 08:47
> To: [log in to unmask]
> 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