[Amps] FW: AMERITRON AL-1500 ????

[R.Measures]

On Aug 7, 2005, at 9:57 AM, Joe Subich, W4TV wrote:

>
> Jose,
>
> The AL-1500 has a slightly undersize output circuit and may melt
> the coil if you try to run "full soup" on RTTY.  Other than that
> - as you have noticed - it is a relatively good value for the
> money.
>
> There will be some who claim that the amplifier is unstable -
> far from it.  If Ameritron have not changed the design and it
> is built with good, low impedance ground on the screen ,

8877 screen?

> the amplifier is very stable.

Autopsy photo of kaput Eimac 8877 s/n HSZ 501 removed from AL-1500:
http://www.somis.org/8877-gs2.JPEG

>
> A significant problem with the 8877 is the ability to easily
> overdrive the tube.  An 8877 takes about 60 watts of drive to
> reach 1500 watts out.  Your FT-1000MP/MKV will drive the pants
> off the tube!   Be very careful about drive levels and tuning
> to keep the grid current below about 60 mA ... otherwise the
> tube is in danger (Eimac recommends 100 mA max for the grid).

Call for reference.
-  In its early 8877 spec sheet, Eimac recommends not exceeding 25W of 
grid dissipation.  At a cathode-grid drive level of 70V-rms, this 
represents about 350mA of DC grid-I.  In other spec sheets, the grid-P 
is rated at 20W max, which represents c. 285mA of grid-I.
>
CHEERS, Joe.

> 73,
>
>    ... Joe, W4TV (ex K4IK)
>
>
>
>> -----Original Message-----
>> From: amps-bounces at contesting.com
>> [mailto:amps-bounces at contesting.com] On Behalf Of Jose M.
>> Valdes R. YV5LIX
>> Sent: Sunday, August 07, 2005 9:41 AM
>> To: amps at contesting.com
>> Subject: [Amps] FW: AMERITRON AL-1500 ????
>>
>>
>> Hello all,
>>
>> I'm getting ready for next winter 160 meters season and in
>> the process I'm upgrading the station, to starters I bough
>> a Yaesu FT-1000MP MARK-V with SSB and CW INRAD optional
>> filters and INRAD's Roofing Filters and now I'm looking
>> for a new lineal that will not deplete may back account,
>> so I have a question for the group.
>>
>> While searching for an affordable amplifier I came across the
>> AMERITRON AL-1500 with the rugged 3CX1500A/8877 and I wonder
>> if any one here has used one of these amplifiers before and
>> what has been her/his experience with it, I will be in Florida,
>> Miami and Orlando from August 19th  until the 28th and
>> would like to get the new linear from AES and perhaps meet
>> some of you guys.
>>
>> Thanks for any information and or opinions regarding this amplifier.
>>
>> Have a very nice weekend.
>>
>> 73/DX Jose M. Valdes R. (Joe) YV5LIX
>> eQSL.cc Advisory Board Member
>> QSL manager EA7FTR
>> SYSOP YV5LIX DX Cluster
>> telnet://yv5lix.org.ve:7300
>> VHF Packed: 145.430 YV5LIX
>> http://www.yv5lix.org.ve
>>
>>
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>
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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org