RF Friends Unfortunately there are many false transistors from China but there are some who are paid to say this is not good. I researched and made sure that under the different markings was the original thing.
Personally, I've been buying fake (different labels) for two years now and they work perfectly. You do not need to believe everything that is posted on the internet .. we need trusted store... only this is important...
p.s.
sorry to everyone who bought real fake.

rigmo wrote: ↑Mon Apr 20, 2020 7:23 pm fake ?
https://www.aliexpress.com/i/32943270648.html
https://www.aliexpress.com/i/32816018892.html
https://www.ebay.com/itm/1PCS-New-MRF91 ... 2998904155
https://www.aliexpress.com/item/4000846835989.html

Well... From my experience

The picture they use to advertise the product they are selling does not mean that it is what you will receive.

rigmo wrote:RF Friends Unfortunately there are many false transistors from China but there are some who are paid to say this is not good. I researched and made sure that under the different markings was the original thing.
Personally, I've been buying fake (different labels) for two years now and they work perfectly. You do not need to believe everything that is posted on the internet .. we need trusted store... only this is important...
p.s.
sorry to everyone who bought real fake.

There isn't alot of reviews so to me it tells a story. If you get reviews with loads of folk commenting on them then you'll be sure what to buy and not to buy.

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https://www.aliexpress.com/item/32816018892.html
I get 200W easy (short II test on 220W 15minute but heating go fast obove 48.. i stoped....) 26V my calculation get 80% efficiency... if I run only 175W 25V 8.1A run over 4h temeprature do not cross 36°C

soon

rigmo wrote: ↑Tue Oct 13, 2020 5:03 pmsoon

Interesting

Why don't you put a solid jumper across each screw of the mrf9180 on both ends then screw down but make sure your heatsink is apply a little compound directly underneath then tighten down.

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Electronically wrote: ↑Wed Oct 14, 2020 3:04 pm Why don't you put a solid jumper across each screw of the mrf9180 on both ends then screw down but make sure your heatsink is apply a little compound directly underneath then tighten down.

Is that suggestion aimed at me

If it is there is always plenty of heatsink compound under my FETs

BriansBrain wrote:

Electronically wrote: ↑Wed Oct 14, 2020 3:04 pm Why don't you put a solid jumper across each screw of the mrf9180 on both ends then screw down but make sure your heatsink is apply a little compound directly underneath then tighten down.

Is that suggestion aimed at me

If it is there is always plenty of heatsink compound under my FETs

No Brian. Just anyone who is thinking of this board. Have you still used the same chip after all those months I know we, spoke about this months back about it. But just curious to the point now Brian.

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Electronically wrote: ↑Fri Oct 16, 2020 11:58 am No Brian. Just anyone who is thinking of this board. Have you still used the same chip after all those months I know we, spoke about this months back about it. But just curious to the point now Brian.

As you can see from the picture of Brian's 150W Linear there is a date of 30-11-19 on it
This is the date the MRF9180 was replaced for a genuine one, he has been running at 26V @ 8A for 16hrs a day ever since

In 25 days time that will = 1 year

BriansBrain wrote:

Electronically wrote: ↑Fri Oct 16, 2020 11:58 am No Brian. Just anyone who is thinking of this board. Have you still used the same chip after all those months I know we, spoke about this months back about it. But just curious to the point now Brian.

As you can see from the picture of Brian's 150W Linear there is a date of 30-11-19 on it

Brian's 150W Linear 26V @ 8A-S.jpg

This is the date the MRF9180 was replaced for a genuine one, he has been running at 26V @ 8A for 16hrs a day ever since

In 25 days time that will = 1 year

Remarkable for 16 hours a day you've done the amp proud Brian for a whole year

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BriansBrain wrote: ↑Fri Oct 16, 2020 11:49 am

Electronically wrote: ↑Wed Oct 14, 2020 3:04 pm Why don't you put a solid jumper across each screw of the mrf9180 on both ends then screw down but make sure your heatsink is apply a little compound directly underneath then tighten down.

Is that suggestion aimed at me

If it is there is always plenty of heatsink compound under my FETs

tnx
tru...
only we need extra gnd pads if heatsink coated... clean aluminium or copper do not need this pads...

some small changes.. soon be in production... universal mosfet board up to 500+

MRF9180 is apsolute leader for investment... cheep and nice output... its very sensitive but if have nice protection can run forever... efficiency is above of 80% drive under 500mW out is 180-190W cold run... under 43°C

rigmo wrote: ↑Wed Oct 21, 2020 3:55 pm MRF9180 is apsolute leader for investment... cheep and nice output... its very sensitive but if have nice protection can run forever... efficiency is above of 80% drive under 500mW out is 180-190W cold run... under 43°C

Is the output clean when you are doing 180 watts output for 500mw input?

Yes sure I drive With clean driver and both have tuned LPF.... last one driver is https://www.ebay.com/itm/FM-BROADCAST-P ... 4274543164?
specially he can not generate harmonics with 100mA drive !

Rigmo what was the outcome of this ?

XXL wrote: ↑Wed Nov 29, 2023 1:29 pm Rigmo what was the outcome of this ?

clean output.. all ok... run well