RM-KL 400 Bench Test

[cb4ever104]

Think it uses 2 x SD1446s .

[Edd200sx]

You can’t get 400 pep out of these no it’s all generous meters.

My n4 does 200w average and 400w PEP on a bird43

That’s with 4x 2879’s at 13.8v it will do more but
The heat already created is ridiculous

Forgive me for coming a bit late to this conversation. Do these amps use 2 x MRF455’s? If so their maximum dissipation is 60w the maximum your likely to achieve is 120w.... regardless of the magic of special watts! How are we getting to this mystical number of 400w or even 500w from a 2 x 60w transistors? I have a VL1000 and that utilises 8 x MRF151 with 150w dissipation so that’s 1200w output not input and yet 2400w input. Being that most amplifiers are around 50% efficient and this does not seem to buck that.....can someone please tell me how we get to 400w from a 2 x 60w transistors? The maximum dissipation is 60w per transistor in any mode. Look up the transistor specs and it clearly states 60w.

Perhaps the spec sheet is wrong!? The manufacturers may have screwed up..... or these amps have w and W mixed up. w being linear and W being logarithmic and yet 26dbw seems to be mystically coming from this special MOSFET

[wa10]

Maximum dissipation of the mrf455 is 175w,

The 60w is rf output in a single ended class C test jig @12.5v 30mhz with reasonable imd specs, up the voltage & more is available,

sd1446 is 183w dissipation & 70w rf output @12.5v 50mhz in class C, @12.5v 30mhz its rated at 100w+ in single ended class C,

You don't get double the single ended output from the 2 transistor push pull amps,

Zetagi & RM have been telling massive lies about output ever since they started making amps,