RM ITALY KL503P, In Stock, Tested (300w Mobile Linear amplifier)

[@JoeR203]

I run the full almost 4 watts from my President McKinley into my KL-503 with no problems. I got it off eBay for $150. It was advertised as brand new, never used. I saw all the drill marks on the top and thought they lied in the description, but seeing those same marks on your unit, I realize it comes from the factory that way.

[@lt1caprice57l]

Those are where the transistors etc are screwed in.

[@trackpackgt877]

How was your 503 doing today two years later? I'm really thinking about ordering one and retiring my old 70s amplifier wanted to hear from somebody that's been running one for a few years specifically how's Side Band

[@JoeR203]

@@trackpackgt877 It still works. However, it doesn't get much use. I live in a condo and can't have an 18 foot antenna set up so I am using a mag mount out on my deck. Not much CB traffic in my area of CT. Every once in awhile someone down south will hear me on skip. Either AM or SSB. But with my lame antenna, I don't get many contacts.

[@trackpackgt877]

@@JoeR203 you should put it in your vehicle I don't have a base station either but I have sideband radio in my pickup truck and I make contacts all over the United States in it and locally everyone is on sideband. Thanks for the info brother

[@JoeR203]

@@trackpackgt877 I don't have a vehicle anymore. I've become legally blind (thanks diabetes) so I don't drive now.

[@125southernnh2]

It is pretty neat you can buy one of these online. Back in the 80's, you had to 'know someone' or go to a shop that knew you.

[@lt1caprice57l]

Back then, Uncle Charlie actually cared AND had enough resources to care. Not so much now. They still do make the occasional bust, almost always some big disrespectful base operator that people complain about for years before anything is done.

[@mikestone9129]

I have the KL203P and it's an awesome little amp. Can't beat it for the money. Using it on my stock Uniden Washington.

[@vincentbarrett5282]

Same thing I'm running and it's perfect 73s

[@flash001USA]

If you hit these with a 3 watt dead carrier up to a 4 watt dead carrier these amps will easily deliver a clean 100 watt dead key and with an unmodified clean modulating radio you should expect a peak power of around 140 watts up to 180 watts that's not muffled or splattering everyone depending on how hard you drive the amp. For their price they're great small station amps!

[@SamuelBarrPhotography]

Nice. Is that PEP?

[@flash001USA]

@@SamuelBarrPhotography They are capable of putting out around 240 - 250 watts of RMS dead carrier but you wouldn't want to run them there on AM. I've ran mine at 200 watts RMS for hours talking on FM and I never had an issue but if you do run the amp near it's maximum ratings you have to place a small fan on top of it to keep it cool and it will work fine. If you run these amps around 100 watts - 140 watts of dead carrier on AM they will peak around 160 watts up to 180 watts on a normal unmodified clean modulating AM radio which is a great sweet spot for these amps to NOT be muffled sounding splatter boxes. On SSB you can expect around 180 watts - 200 watts too. I own three of these (One of their very early amps which is a 4 pill amp and 2 of these newer MOSFET amps. I've had mine for years and I have never had an issue with these amps whatsoever.)

[@SamuelBarrPhotography]

@@flash001USA - Thank you very much for this information, I truly appreciate it!

[@flash001USA]

@@SamuelBarrPhotography You're welcome... If you do get one of these amps, purchase a decent 30 amp power supply. I run mine off of a 12 volt deep cycle trolling battery along with using a small 15 amp maintainer/charger which keeps the battery topped off quite nicely.

[@SamuelBarrPhotography]

@@flash001USA - Thank you, will do!

[@zukispur5493]

I've got one of these amps. I never put more than four watts into it and I never use it over number 4. I've got two fans on top which switch on when the amp gets to a certain temperature

[@SamuelBarrPhotography]

Is that 4 watts average or 4 watts PEP?

[@zukispur5493]

@@SamuelBarrPhotography 4 watts AM FM. Gives me about 200 watts. sidebands I turn the radio power up until the power meter hits about 30 amps. 300 watt-ish swing. That'll do me. I'm 19 stories/floors up. Height really is might

[@Don.E.63]

Good demo Rooster, i may look into getting one of those for the base & the 203p for my truck, would you need to run a low pass filter with them? Thanks in advance.

[@Rooster_Radio]

Some people do, but if it was me I wouldn't bother with the low pass filter

[@Don.E.63]

@@Rooster_Radio thank you for the quick reply, you have a vast amount of knowledge and thank you for sharing it! 73s & subbed tooa

[@CBLounge2112]

Thank you so much for a fantastic overview on such an awesome amp, here at the CB Lounge 2112 we appreciate the quality info!!

[@mayoman8565]

Thanks Rooster I enjoy your videos. I am over here in Mayodan N.C. to the east of you.

[@howardsansome3560]

Good little amps, I have a KL400, it'll make around 300 to 325 on ssb with my dx2547.

[@jameshardenburgh6593]

where in Tennessee is your shop

[@rfoster950]

I have all of the kL Rm Italy's

[@slabridalogisticsllc.2627]

Which one would you recommend on a cobra 29 with talk back and echo. It's good for 8-10 miles now, I just don't know what's all been done to it. Was given to me.

[@slabridalogisticsllc.2627]

@D. J. Trump will do

[@1022videogates]

I hit my kl203 with a 60watt pep President Ronald 10m export. Dk 1 watt swings 66peak. Been doing it for years. What kills them is high dk and swr. I use it as a driver for a 6 pill.

[@Rooster_Radio]

Lol and people wonder why amplifiers don't come with warranty 🤣. I know a guy that used to drive his 1x2 Fatboy with a 2995 doing 150 watts peak. Worked great until it didn't. Worked that way for several years but I wouldn't recommend it

[@kingsoutdoors4379]

I just ended up with a lil Rm kl 40. I wanted just a lil extra to punch through the noise . I have a stock Cobra 29 ltd that I turned up a lil. Would You happen to know if I should back it down before running into The amp? Any advice greatly appreciated. Thank You Sir

[@sdg1970]

What's wrong with using a Stryker turned right down?? I use a KL203P sometimes with my 955-HP and on FM (am in UK) turn it right down to 4 watts and on SSB make sure it varies no more than up to 15 watts. Are these more sensitive than 203's?? I note only 6 watts all mode input.

[@Rooster_Radio]

It's a waste to buy a 100 watt radio, and turn it down, only to run with a 150 watt amplifier. Use the radio at its capable operating power and buy the appropriate amp, rather than cut the radio down.

[@sdg1970]

@@Rooster_Radio Which amp would you recommend with the Stryker?? 503 HD??

[@Rooster_Radio]

@@sdg1970 a Carl built or Fatboy with ssb, or if you're picky one with biasing and ssb

[@sdg1970]

@@Rooster_Radio Way out of my league that and not sure they're available in the UK. I'd probably black the street out using it anyways. I've just bought a 503 HD though, I dare not run anything more than that, and will run 25-30 into it. Many thanks, I always enjoy your videos.

[@KC9RXP]

Would a stock president lincolon 2 plus be too much radio for this amp?

[@djweaver30125]

What amp would you recommend for a president lincoln II+

[@JohnnyRebKy]

I don't know a thing about amps. I got a galaxy 959 doing 32w peak. So this would be ok for my radio ?? I just want a little extra juice for when I need it in my pickup truck. Will run barefoot most the time.

[@Rooster_Radio]

Yes will work great together

[@tomjacka7401]

how about a president lincoln ii+ would that be a good radio for this amp.

[@almartiniii1541]

Check your Lincolns output. Mine will drop to a 2 watt dead key and swing up to about 22 watts peak on a Dosy. I've seen some that only turn down to a 6 watt dk. Not so good. Also if tuned up seen peaks as high as 50 watts, also not so good for the kl503. If your on the low end like mine, the 503 is good. If yours is tuned high, get the 503hd. Rooster deals in both.

[@mpmy97]

Could I use a President Lincoln plus II with this?

[@scotthansen429]

Ive got a gump 29 I've often thought about getting a 200p I think it has a single transistor. Those 203's are pretty good amps

[@Rooster_Radio]

I like the 203, and 503 so far. I'll be ordering other models soon

[@coryb7216]

Would this be a good plug and go amp for a bear cat 980ssb? Or would it have to be converted to mach the cb band

[@SiddVic1]

Just bought one of these off of ebay. Took a month to get here. Thanks for the review. Nice reporting

[@Rooster_Radio]

You decide to get another I'll meet or beat any price and ship it priority mail

[@SiddVic1]

@@Rooster_Radio Roger that. Will keep it in mind

[@RogerSayers]

@@Rooster_Radio Hey!! Does that still go? I'm interested in getting one... let me know thanks

[@EdzashedFudwinkle]

Difference between a kl400 and a kl503 is about 15amps, probably more. I got a 40w 6900n, only use 15w if that with a kl203 (100w), but I'm looking at the 400 (200w) over the 503 (250w), but thats me, my psu is only 35amp.

[@natetate2795]

Do you think this would be safe with the 447 Stryker since it’s such a small radio?

[@Rooster_Radio]

No

[@natetate2795]

What’s the best option for a kicker?

[@MM-kx3pj]

Could you use this with the Lincoln II+? With the RF Power turned all the way down? I see my dead key can be set from 1-5 watts. I’m kinda worried about the swing? Thanks

[@Rooster_Radio]

Your peak output is likely still too high

[@MM-kx3pj]

@@Rooster_Radio thank you. With my rf all the way down. And with the meter I have I’m showing 3 watts. And about a 25 swing. Thanks for getting back to me.

[@thomaswellcome5663]

I have a stryker 955, can't I turn down the power on my stryker to run this amp?

[@Rooster_Radio]

Id just buy an amp designed for your radio

[@thomaswellcome5663]

@@Rooster_Radio do you know where I can find one

[@thomaswellcome5663]

@Rooster_Radio Don't know much about them, could you recommend something and or do you carry anything?

[@PennSyx]

Hey Rooster Just seen this video last night How does this amp work with the Uniden Bearcat 980 SSB or will it work with it?

[@pmrealestate44]

Mr Rooster so i changed radios to one that does 100w and can drop to the required carrier and peaks, my question can i still keep the linear on line in the off position when running the radio at full power, and then drop the power when need to run the amp?

[@Rooster_Radio]

No, the bypass circuit will not withstand the 100w

[@pmrealestate44]

@@Rooster_Radio thank you very much for that information so i will keep it at the 1-2 watt carrier swinging about 25-30 on watts on ssb and use the other radio for all other high power communications

[@elonlovesyou]

Connex 3300hp on low output? I believe my carrier is 2 watts on low.

[@Tony-rl2fr]

Excellent information Rooster, thank you!

[@stevepatterson2290]

question I have a Yaesu 450 100 watt radio but want to make it a 200-250 watt radio on SSB. I the power will go down to 5 watts. what is your opinion ?

[@denp54z]

I'm wondering too . I have a Yaesu FT 897 with adjustable rd output power, I'm still not clear on the dead key on SSB ? So how did you make out ?

[@denp54z]

Rd = RF

[@scottmorton5573]

Can you not use Stryker with the high drive version?

[@appalachianunderground8474]

Awesome video, I know you addressed this but..I have a Uniden 980 SSB as a base station on a Tram 1498 . It runs on a pyramid power supply. Will this amp run , connected to the same power supply without any radio mods or adjustments? Thanks very much for your time ✝️🇺🇸🤙🏻🅰️

[@trackpackgt877]

Will it do the full 450 on sideband? I don't ever see anybody test these amps on sideband I don't run Am anymore nobody's on it appreciate the video

[@ronalddotson9490]

Can you tell me about the KL 400

[@chestertillson4819]

i hook up my amp and some how it gose on with out the ground wire hookup only the ant^ s are connected and radio is that allright or is their something wrong the ant*s seem to ground the amp

[@Rooster_Radio]

Some amps will find just enough ground to power on through the antenna. I've seen that before.

[@woodchuck8197]

Only thing with these you really really got run low watts they do not like to get driven hard

[@ericzerkle5214]

I have a HYS 300 and on high it has no headroom unless you run the amp at a 1/4 watt. On low itll take about 2 to 3 watts.... Crazy low drive.

[@jeremysmith8020]

I do 2 watts swinging 28 does 300 w output.. get the HD you can drive them harder

[@McCoyGamingExperience]

What’s the price on these?

[@andycampbell5416]

rooster,,,,,, im often told that these amps sound "scratchy" when turned up high,,,, what is your findings on this have you been on the recieving end of one when its on full power?

[@issacmilo5758]

you prolly dont give a shit but if you guys are stoned like me during the covid times you can watch all the latest movies and series on InstaFlixxer. I've been streaming with my girlfriend recently xD

[@rohanspencer2601]

@Issac Milo Yup, have been using instaflixxer for years myself =)

[@kcole5152]

What size of power supply

[@ron99693]

What do you mean by turning the carrier down?

[@Rooster_Radio]

Deadkey, unmodulated power

[@timmygilbert1371]

Hi rooster im not asking the price i will text you for that just wondering if you have the 503 p or the high drive version in stock ? Thanks .

[@MusicMinisterJP7]

Interesting compatibility analysis. I've a question, I have a SS 3900G which has an EPT360013B pcb. It has twin finals and does a 13w on Am and 22 on SB. I was considering one of these RM Italy KL203 100w linear. My question is, would I be able to use it with my radio?

[@Rooster_Radio]

People do it all the time , but I would not use a dual final radio with one of these amps. You might be ok with output that low

[@MusicMinisterJP7]

@@Rooster_Radio I see. Why do you say,, not with a dual final radio? I'm assuming a linear is used when trying to reach the outer limits of other states, or base time continuum..lol. I returned a Sirio Performer P5000 and ordered an Antron 99 18" antenna. Capable of 2000w. But I wonder if the receive is as effective as the transmit.. So aside from the 100w, how about a 70w linear?

[@Rooster_Radio]

@@MusicMinisterJP7 the reason I say not a dual final is typically a dual final radio will produce 35-45 watts peak easily on a bird 43P, which is the meter all of the amp companies and builders use as a reference. Most dual final radios produce considerably more than 25/30 watts.

[@MusicMinisterJP7]

@@Rooster_Radio This radio, when I bought it, it came with the VR13 Wattage control wired to a 10k pot w/knob on the side. I've pretty much always kept it low, bcuz in my area, whenever I cranked it up some, other locals would tell me I was stepping on them, and they would not be heard. But at night I used to like reaching out to farther stations. I mean having the Antron 99 antenna gave me the advantage of reaching islands in other countries. I've never had any kind of wattage or signal distance equipment to know this radios exact range. So if I did incorporate a 100w linear, I'd be keeping the VR13 close to the 4 or 5 watt range, until I can find a not so expensive watt meter.

[@thatfonkyhonky336]

I just ordered one from a few days ago. The tracking function on eBay is not saying it's been shipped yet. Please put it in the mail I'm excited to get it lol

[@Rooster_Radio]

If it was ordered on the weekend it will go out no later than today. Thankyou for your business and I hope you enjoy your new toy!

[@thatfonkyhonky336]

Thanks brother. I have a build project on my bench to put me in the kilowatt club but it keeps taking a backseat to more pressing projects so this should do in the meantime

[@thatfonkyhonky336]

Getting around 250 on SSB and around 170 pep on a.m. which works best with the power setting on three. Pushing about 12 on SSB and on a.m. 2 swinging to 8. No NPC MOD done on the radio. So I'm pretty confident I won't have any real heat issues

[@backslider893inthebeerjoin7]

Just bought a Cobra 1K base. It looks brand new and hasn’t been hacked whatsoever. I have three Cobra 2Ks (only one works %100😄) but the 1K seems to outshine the 2K; Especially in receive. Your fault that I bought one😂😀. If you come across some clean Cobra speakers let me know. Thanks!

[@Rooster_Radio]

You made a great decision!!

[@bstylekilla]

Sent you a message Rooster, hope you got some stock would love to pick one up.

[@Rooster_Radio]

If your number starts with 614 i messaged you back

[@chestertillson4819]

iam use ing two 7foot skip chaser ant co phase with a 959b galaxy and a new kl 503 hd 1.1 match 1 to 40 somebody was telling me use only one ant and get better range and recive is this true or just leave it alone ps thank you the amp works great

[@havennewsome4281]

is the kl 503 hd?? and do you have one for sale??

[@skyblazer9137]

How much ?

[@davidroberts2404]

Would that work with dx959 galaxy? Know that my Dx98vhp is too much

[@Rooster_Radio]

Your 959 probably does around 30 watts peak give or take. Should be ok

[@davidroberts2404]

@@Rooster_Radio so how much for a kicker shipped

[@TM-gv6zv]

A rooster I'm interested in one of those amplifiers is there anyway I can get in contact with you and we can discuss it?

[@Rooster_Radio]

423 299 3535

[@ron99693]

How can I buy one from you?

[@pmrealestate44]

Hey Mr. Roster i have an Mfj 35 amp power supply, Will that be enough to run this baby....

[@Rooster_Radio]

Not on ssb

[@pmrealestate44]

@@Rooster_Radio so I got a 50 amp and this baby is smoking....... thank you sir..

[@k9policexj]

hey Rooster, did you ever get any more of these in stock? Looking to get an amp for my new Galaxy 949.... Thanks!

[@Rooster_Radio]

I'll have some in tomorrow

[@k9policexj]

@@Rooster_Radio Thanks...I'm kinda torn between this and the 203p.... I have a realistic 465ssb running a 2watt dead-key that the 203p is perfect for.... either way i'd love to get one...

[@Rooster_Radio]

@@k9policexj the 203p arrived yesterday. The 503 and 503hd should be here today. Message me at 423 299 3535 if you're looking to get either

[@RogerSayers]

Hey Rooster! I'm interested in one of these. I have the uniden bearcat 980 SSB, Will it work with it?

[@thesuccessfulbarber]

Yes

[@TM-gv6zv]

I'm new to your channel so tell me how do I contact you to purchase one of those amplifiers?

[@Rooster_Radio]

Text message me at 423 299 3535. We can do paypal, check, usps money order, whichever is most convenient or comfortable for you. I will likely be listing these on ebay soon as well as long as I have the inventory, but you will get a better price buying from me directly.

[@LEEBO-56]

GOOD VIDEO ROOSTER. KEPT UP THE GOOD WORK BROTHER..73'S FROM DESPERADO 56 NORTH OF TAMPA FL.

[@Brenda-jf2pe]

Great amp

[@David-qf6ls]

Nice Amp Mr. Rooster! Sacramento* California Wavin! 🇺🇸👍

[@charlespatrylak5631]

Can I use this amplifier on a icom 7300

[@PhantomWoIf]

no, the 7300 makes a power overshoot when keying up the transmitter, even when the power level is manually set low in the menue, that powerovershoot destroys external power amplifiers such as this one, even if the powerovershoot is for like only a second. can be that the amp survives that 1s overdrive, i wouldnt want to risk that.

[@ron99693]

What exactly does it mean by pre amp?

[@Rooster_Radio]

It's a receive amp

[@LEEBO-56]

OK LADY'S AND GENTLEMEN..LET ME CORRECT A STATEMENT ( BUYER'S BEWARE ) IT WAS A MISUNDERSTANDING IN TEXTING BETWEEN ROOSTER AND I. SO I MITE STILL GIVE THIS LITTLE BOX A TRY YET. BE SAFE AND STAY WELL EVERYONE..73's

[@Rooster_Radio]

Thankyou, glad we could iron it out.

[@bamagregv]

Hi from Dauphin Island Alabama . I want one

[@charlesbaker5309]

Will the RM Italy work well as a driver?

[@Rooster_Radio]

Yes it will. I have a video using one to drive a gs35b steel tube. One of my locals uses one as a driver daily

[@andreipopov350]

Hi, what is the lowest power output as a driver? In AM mode .Thanks in Advance!

[@trondyne3513]

Stryker like other "exports" can be turned down to whatever you like... Why not use those? I have a President Richard that can be turned down to whatever you like as well.... You can set it for 1 to 8 watts if you like...

[@Rooster_Radio]

If you like to choke radios back, be my guest. My experience with strykers and others is the performance suffers when this is done, not just on the watt meter.

[@dancraver3815]

Do you have them in stock right now?

[@Rooster_Radio]

July

[@andycampbell5416]

cheers, good test

[@David-qf6ls]

Cool Spaghetti Amps I Own S Couple!👍

[@Rooster_Radio]

What models

[@David-qf6ls]

RM KL40 and RM KL 200 Made In Italy I Bought Many Years Ago Fine Amps They Are And A Great Bang For Your Buck!👍

[@Rooster_Radio]

@@David-qf6ls I agree!

[@jameswaddell3319]

ROOSTER I HAVE A RM ITALY 503 THE MOSFETS BURNED OUT WHAT CAN I USE FOR REPLACEMENT PLEASE HELP ME I HAD TALKED TOO ON 11 METERS FROM NEW YORK I HELP BUDDY THANK YOU ROOSTER

[@generaluser4145]

Fcc law says 4 watts. I would expect using this on a cb is illegal.

[@Rooster_Radio]

What rock have you been living under all your life? I would expect you're still a virgin

[@kcole5152]

What about the anytone 6666 can this work

[@LEEBO-56]

I'VE BEEN TRYING TO BUY ONE OF THESE AMPS FROM ROOSTER FOR MONTHS WITH NO LUCK..EITHER HE'S TOO BUSY OR NONE IN STOCK. TOLD I'LL GET BACK WITH U WITH NO LUCK...( BUYER'S BEWARE )

[@lrobie123]

Try the Newegg dot com website for them to buy

[@paganphil100]

Leebo Nance: Plenty available on Ebay.

[@rfoster950]

Get some kL-703

[@michaelkirkwood3316]

I'm interested in the KL 503 P how do I contact you

[@henrycross8776]

Chicken Banders running power......hahahahahha

[@Rooster_Radio]

Hammies still griping about it 60 years later haha

[@Eric-zi1oz]

Hammies being lame and never getting laid, hahahahahahhaha!

[@freepressright]

I fancy myself a pretty intellectual guy. I'm educated, I'm professional, and I love CB radio without shame. Some hams are rigid and have no sense of humor. Some have major superiority complexes too. I'm not trying to stereotype an entire group, but some need to seriously lighten the hell up.

[@henrycross8776]

@@freepressright Thats the word on CH19 , youre a fancy guy at the glory Hole hahahahaha

[@scottcarrier1121]

@@freepressright I'm a HAM and you're absolutely right about that!!....Ridiculous!!