RM KL 203 Transistors

Post by **163TM847** » 16 Jul 2012, 12:13

There isnt anything printed on them and diagram just states MOS RM3, Will IRF520's work ?

Post by **Clint** » 16 Jul 2012, 12:22

Yes, I am sure in fact they are the same.

Post by **UGLY_BOB** » 16 Jul 2012, 12:24

Black Spirit wrote:Will IRF520's work ?

Yup... Been there... done that.

Ugs

Post by **163TM847** » 16 Jul 2012, 12:33

Cheers

Post by **Ashtec** » 16 Jul 2012, 13:19

Yep IRF520N's work but they do run a bit hotter!!!!!!!

Post by **bigpimp347** » 16 Jul 2012, 13:51

IRF520N is the higher power/voltage device so better than non N.
or MS1307 is the other, i run nine in a B400 not as good as original (must be re baged IRF's)

Post by **163TM847** » 16 Jul 2012, 15:02

I replaced them and with 5w in [FM] i get 50w out.

The four i removed had all gone dead short

Post by **Cyclops** » 16 Jul 2012, 15:04

IRF520 will work but will be down on power. I needed a replacement for a RM3 and used a Fairchild mosfet, I will look at work tomorrow for the part number. there was about £1 each from rs and 1 in a kl35 does just shy of 40watts, IRF520 in the kl35 did around 15watts.

Post by **163TM847** » 16 Jul 2012, 15:12

ahhhh i just checked the batch of 520's i used and they are non N so i will whip them out and put 520N's in instead.

Post by **Cyclops** » 17 Jul 2012, 18:00

Nick this are what i have used in place of the RM3 and they work very well, much better than IRF520 or 520N

http://uk.rs-online.com/web/p/mosfet-tr ... 4E4F4E4526

Post by **Ashtec** » 17 Jul 2012, 18:09

Black Spirit wrote:I replaced them and with 5w in [FM] i get 50w out.

The four i removed had all gone dead short

Sound's about right to me with 10watt you sould see 80 90 may be the ton!!!

Post by **163TM847** » 17 Jul 2012, 18:32

I havnt replaced them for non N yet, but with the ones in there i get 80w with 10w in but SWR goes right up even on dummyload...So they are not working that well, I have chucked it in the drawer for now and will probably replace them for 520N when and if i can be bothered

Post by **Ashtec** » 17 Jul 2012, 20:29

Black Spirit wrote:I havnt replaced them for non N yet, but with the ones in there i get 80w with 10w in but SWR goes right up even on dummyload...So they are not working that well, I have chucked it in the drawer for now and will probably replace them for 520N when and if i can be bothered

If it gos for sale i will have it off ya!!!!!!!!

I could all ways use it in the car............

Post by **jimtylee** » 26 Mar 2013, 20:59

Clint wrote:Yes, I am sure in fact they are the same.

Hi,
Is the irf520n a direct replacement for the original MOS RM3 DEVICE....IE are the lead out pins the same
my amplifier is the KL 203.....
THANKS
JIM...........

Post by **jimtylee** » 26 Mar 2013, 21:05

Ashtec wrote:Yep IRF520N's work but they do run a bit hotter!!!!!!!

Hi,
Is the IRF 520N PIN OUT THE SAME AS THE MOS RM3 DEVICE AS I NEED TO CHANGE ALL FOUR
all short circuit
thanks
jim

RM KL 203 Transistors

RM KL 203 Transistors

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Re: RM KL 203 Transistors

Re: RM KL 203 Transistors

Re: RM KL 203 Transistors

Re: RM KL 203 Transistors

Re: RM KL 203 Transistors

Re: RM KL 203 Transistors

Re: RM KL 203 Transistors

Re: RM KL 203 Transistors

Re: RM KL 203 Transistors

Re: RM KL 203 Transistors

Re: RM KL 203 Transistors