MS1051 30MHZ 100 watts

[Grogan]

Was looking at the data sheet and looks like RM Italy uses them in the KL505V with fans. with the rating 1t says 10 to 34 amps Shouldn't the amp draw more than 34 amps ??? on high. Uses four of them was wondering what the real output of the amp is.

 

[Robb]

You mean four 2sc1446's @ 75w/ea?
Might be better to use a 50A supply just to keep it cool 'n safe.

 

[Grogan]

Was looking at the pdf file and it says 4 x MS1051 when you bring up the file is says KL505 and not the KL505V might be different.

 

[Robb]

OK; I found it here:

http://www.microsemi.com/document-portal/doc_view/9555-ms1051-datasheet-rev-b-pdf

 

[RatsoW8]

Maybe they are alluding to not driving it to distortion.

 

[vkrules]

the later 505 use mrf455 .they have used 2sc1446 and MS1051 on earlier series amps. FYI V stands for ventilation,has the fans fitted.
The 455s would be ok at 34 amps (bit more for wiggle room) but not the MS1051

 

[bob85]

RM seem to use whatever they can buy at the right price at the time, jumping from 1446 to 455 then back again several times over the years,

They did do a run with the larger 1051's some time back in the millennium amps and some kl amps,
you never know what will be inside until you look,

on full tilt FM the 4x1446 amps draw 40A+ @300w+ FM and the fuse holders melt if you get long winded, @34A you won't see anything like the output they claim,

RM should have used 4 fuse holders and 5w feedback resistors in the KL amps like they do in the HLA amps.

RM's V fan setup is total CRAP especially so on the KL800/805's with farty little fans fighting each other,
a single 120mm fan on the none V versions gives MUCH better cooling.

 

[BBB]

OK; I found it here:

http://www.microsemi.com/document-portal/doc_view/9555-ms1051-datasheet-rev-b-pdf

Selling for $50 each on Amazon:

amazon.com/MS1051-Microsemi-Microwave-Transistor-Application

Or $32 each here:

http://www.aliexpress.com/store/product/APT-MS1051/121234_1485163793.html

Very interesting. Wonder how they compare to the 2sc2879 in the real world? Need a separate thread on these maybe?