[Amps] NXP 65V LDMOS 1K80H-1800W

[Carl]

Yep and a sloppy label thrown over a Chinese KT-88 box.

Ive used many Chinese 8877's in ham and industrial amps with never a report 
of a problem which is no surprise as they use Eimac supplied tooling and 
training.
Eimac wants nothing to do with the ham market as it is more trouble than it 
is worth. Their market now is replacements for ISM, military, radio and TV 
and whatever else they supply. That market is dwindling along with 
employees.

There is no joy on the horizon for US tube manufacturing.

Carl


----- Original Message ----- 
From: "Jim W7RY" <jimw7ry at gmail.com>
To: "AMPS" <amps at contesting.com>
Sent: Sunday, December 24, 2017 9:24 PM
Subject: Re: [Amps] NXP 65V LDMOS 1K80H-1800W


> How much for an 8877?
>
>
> https://www.ebay.com/itm/3CX1500A7-New-RLM-MICROWAVE-Full-Power-Out-Guaranteed-Buy-It-Now-325/322954029006?hash=item4b318f67ce:g:4QkAAOSwj99Z9Vzx
>
> 73
> Jim W7RY
> Merry Christmas
>
>
> -----Original Message----- 
> From: kstover at ac0h.net
> Sent: Sunday, December 24, 2017 8:09 PM
> To: 'Bill Turner' ; 'Amps group'
> Subject: Re: [Amps] NXP 65V LDMOS 1K80H-1800W
>
> What happens when they quit making tubes?
> I can think of one company making a CCS rated tube final amp (Alpha) and
> they are hanging on by a thumb nail with their $6K amplifier. The 9500 
> won't
> do CCS RTTY or FM at 1500 watts without auxiliary cooling for the power
> supply.
>
> Ameritron amps are not CCS rated, read the manuals. OM Power may be CCS
> rated but they use those evil noisy Russian tetrodes. The blowers in these
> amps are all famous for sounding like a Bell Jet Ranger lighting up but 
> it's
> the noise that SSPA's make that always gets thrown out. Elecraft is 
> testing
> a new cooling system for the KPA1500. New fans that turn slower, make less
> noise and cool the amp just as well.
>
> Any company producing an SS amp running 1.5Kw out with just one of these
> LDMOS devices are idiots.
> Everybody but SPE are using two.
>
> I just looked at the price for a new matched pair of RF Parts 3-500ZG's.
> $400. A new Eimac 8877 will set you back $1399, a pair of the these LDMOS
> devices, depending on dissipation and voltage rating are a push for a pair
> new 3-500's. These are all new prices.
>
> The Chinese versions of the tubes are cheaper, about 50% cheaper, but they
> could be gone tomorrow depending on which way the wind blows.
>
> Point to all this is SSPA's are the future, like it or not.
>
> -----Original Message-----
> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Bill Turner
> Sent: Sunday, December 24, 2017 5:16 PM
> To: Amps group <amps at contesting.com>
> Subject: Re: [Amps] NXP 65V LDMOS 1K80H-1800W
>
> ------------ ORIGINAL MESSAGE ------------(may be snipped)
>
> On Sun, 24 Dec 2017 08:49:23 -0800, Jim wrote:
>
>>##  I would like to see what both these amp manufacturers  have to say
> about  duty cycle.
>>If they are  1.5 kw  ICAS,  I will pass on em for now, not for the $7K
> price tag.
>
> REPLY:
>
> Before anyone gets too enraptured over SS amps, you might want to 
> reconsider
> the advantages of tube type amps:
>
> 1.  With a pi or pi-L tank, no antenna tuner is required up to SWR of 
> about
> 3:1.
>
> 2.  Likewise, no low pass filters.
>
> 3.  Much more resistant to accidental overloads.
>
> 4.  Heat dissipation is easy.
>
> 5.  Usually cost less unless you want autotune.
>
> 6.  1.5 kW CCS is easily achievable, i.e. a single 8877 pr pair of 
> 3-500Z's.
> The most common limiting factor is the power supply, not the tube.
>
> Drawbacks:
>
> 1.  Warm up time with some tubes. Not an issue with 3-500Z's or other
> filament-type tubes.
>
> 2.  The cheaper ones are all manual tune.
>
> You pays your money and takes your choice.
>
> 73, Bill W6WRT
>
>
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