RM Italy KL 503 HD, Complete Review, Output test pre amp, mobile linear amplifier

[@GroundControl204]

I have a couple videos on the KL703, great amp like the 503. Awesome DC and RF filtering and definitely more linear and cleaner than the actual home brew amp builds, only thing is there is no high SWR protection circuit. Great video Rooster, 73.

[@ericklein4282]

You bet ya that they're well designed AND built amplifiers.! >> The KL-805 (28vdc, using MRF-422s) has a very well designed, high-SWR (about @ 3:1) auto shut-down circuit, but only because it's their most powerful "10-meter" amplifier (outside of their high quality Ham / HF / Amateur linear's) but are also reflected in their price.!) Regards from Eric Klein, of Klein Communications...

[@vegasfordguy]

People talk a lot of smack about these mosfet amps. From my experience they perform just fine as long as you don't overdrive them and your dead key is set low. They are good little amps, people just burn them up because they run them incorrectly. I'm currently running a 2x8 Superior mosfet amp with ten Palomar Erf-9530's. I have no problem seeing 1kw. I'm driving it with 6 watts carrier and 45 swing.

[@5940-c7w]

I am also running a 2x8 Superior excellent AB1 amp

[@frankinstein6456]

What's the name of the 1000 watt Mosfet linear you run im looking for one

[@1000XL]

@@frankinstein6456 Rocketbox Electronics

[@125southernnh2]

The high drive is a sweetheart. I'm using one now.

[@albertrollan1561]

Hi! Where did you purchase yours and how much does it cost?

[@EdzashedFudwinkle]

@@albertrollan1561 about $700, £500 for me in the uk

[@robertcook5972]

This is a P to P linear no more than 35 watts P to P into it. Per KL seller to me . I have 2 of them Not 35 Watts it will kill linear only 35 P-P watts

[@Iheartmyson]

So i have to set my Crt variable radio max to ? how much watts? In this video he uses 2 watts. Mine does 2,5 watt lowest . On internet the specs state that you can put in max 35 watt . Which I dont want : use the top input to spare it. The radios output turn switch makes the wattage go out slow at first. But halfway it jumps real quick to the 38+ watt output. So what is a save output wattage to set my radio at please? Sorry for my bad english grammar btw.

[@gkl5999]

nothing wrong with mosfet amps as long as you have all your ducks in order, good antenna, good SWR, good coax, and a clean output radio

[@jesseworkman4418]

I don't have ducks they're not in a row. I have squirrels. 😆🤣😂

[@INTHEMIX74]

would be nice to see amp reveiwers do ssb output as well...we are not big into am in australia 80% of us use ssb ..we chuck am radios in the bin here....

[@Rooster_Radio]

if you drive it with the same output on ssb it will do the same amount of power. 35 watts of peak power is 35 watts of peak power regardless of AM or SSB. Unless your radio does more on ssb than am the output will be the exact same

[@mattwinn9607]

It's still an AM radio on ssb

[@dorianconor4983]

I guess it is kinda randomly asking but does anyone know of a good website to stream new tv shows online?

[@terrellbraxton19]

@Dorian Conor I would suggest flixzone. Just search on google for it :)

[@ZommBleed]

@Southern Gunslinger They chuck them in the bin, same as their guns. Now they have no choice but to comply with their COVID and VAXX overlords. SSB will soon be added to the list.

[@Bernard-John]

HI,good video, well explained, I have the RM 703 model, very clean and clear modulation, but she is hungry, I would recommend 60 Amp power supply, for the full potential, thanks from Rotterdam.

[@TimMars-zv7wj]

Great video, love the rm amps myself. Wish they would release a 1k model!

[@robertsmotherman]

I just ordered one from you in excited about it.

[@rallypoint1]

I like that amp!! I guess my McKinley DK at 4w swinging to 12w should drive that amp. My 203 does 150w with a 1.5w DK. Awesome amps!!

[@Rooster_Radio]

12 watts wont drive it to full potential. You'd be better off with a standard 503 or 503p. Even those models recommend 25 watts peak

[@rallypoint1]

@@Rooster_Radio Thanks for the quick reply!! Ok that’s good to know. Figuered with the HD I wouldn’t have to lower RF power when going from SSB to AM and vice versa. I will shoot you a text.👍🏼

[@RogerSayers]

Howdy Rooster, Are you still amongst the living? I sure hope so cause I need your help. So, thanks for sharing this video with all of us. I'm wanting to get one of these 503 amps. Do you sell them? If so let me tell you what I have so far , I have a uniden 980 SSB and a SolarWinds A-99 omnidirectional base station antenna. I'm not a rich man so trying to set myself up with a fairly nice base radio. My question is can you guide me through this stuff? Will the 503 amp work with my bearcat 980 SSB radio? Will the radio need any internal adjustments? Any help or information you can provide me with will be greatly appreciated. Thank you very much....

[@rickyh4796]

Can I put this on a cobra 29

[@W5KJD]

I got one from you and I love it.

[@RidingDirtyAdventures]

crazy love your vids never realized ya live so close to me... I'm in SE Cleveland Tn......

[@Rooster_Radio]

Awesome. Do you talk on the radio?

[@321CatboxWA]

FYI , warranty void if broken seals are not allowed or legal in the USA. In other words nobody can legally void a warranty over a broken seal and they know it. Thanks for posting.

[@Rooster_Radio]

Good thing there's no warranty on any of these amplifiers realistically anyways 😂😂😂. Ultimately a manufacturer can decide not to warranty for something for any reason they want.

[@321CatboxWA]

@@Rooster_Radio yup

[@321CatboxWA]

@@Rooster_Radio I like that you check 'em out.

[@JoeR203]

I have the regular 503 (gold casing) and the instructions say input power is 1-6 watts.

[@Rooster_Radio]

1-6 watts AM carrier, not peak power, even a stock cb will produce over 6 watts peak power

[@JoeR203]

@@Rooster_Radio I have an RCI Ranger RG-99 that I wanted to use but I think it would be too much for the amp and I don't want to open the radio and mess with the internals to turn the power down. So I bought a President McKinley to use instead. Not sure if I want to keep the RG or try and sell it.

[@mikestone9129]

My Uniden Washington is pretty much un-molested, so doing about 20 watts. Is this gonna be enough to get 300+ watts out of this 503HD? Or would I be better off going with a 503P?

[@albertrollan1561]

Hello there! how much is that kind of ampli? Where can i buy it?

[@honeybadgertruckin1837]

Will a connex 36hpf pair good

[@guytrent1603]

Awesome amp how much is it

[@johnnywood8082]

Which one should I use with a Galaxy 99V puts out 40-50 watts? Hi drive for sure?

[@theskeptikaltruckr]

What input voltage were you running into the amp at the time? I’ve watched the video several times and never heard what you were running into it.

[@Rooster_Radio]

@@theskeptikaltruckr probably 14.5

[@stevencarroll5644]

Regards from Nov Scotia, Canada ! Just coming back to cb from the 90's..have a uniden pro520xl and k40 magnetmount. Was just given a trc-485 ssb to play with, local chatter is dead, love to get back into shooting skip..what amp would you recommend to kick it up a bit with reliability? Thanks and cheers!

[@ronaldgrimmig6659]

I have the same cb as you with the K30 magnet mount. Did you find an amp that works good, and did you have to do anything to the radio to not over drive the amp? Not sure what the dead key is on these.

[@stevencarroll5644]

@@ronaldgrimmig6659 no, been debating to order the rm italy or a bj 300..

[@ronaldgrimmig6659]

@@stevencarroll5644 I've been searching everywhere trying to find the dead key and peak watts for this uniden. Without buying everything to test it myself. Want to add an amp in my truck, camper, and sxs. All on same CB.

[@CEWade]

What power supply are you using for this amp?

[@EricWTwiss]

Would you use the HD with a Uniden Washington that swings to around 20W on SSB?

[@Rooster_Radio]

Yes but the regular 503 would also be fine

[@mikestone9129]

Thanks for asking, I have the same rig and use the 203p right now, want to up it to the 503.

[@ron99693]

I'd like to run my president lincolin 2 plus with this amp, is that doable?

[@ramonnunez8951]

Do amps mess up a semi truck ecu? I was told it will fry it by some tech out here in Nevada and another tech from California said no it shouldn’t as long as i got good coax and low swrs and another tech said well it can 🤨…. So im here asking you now what do you think is it safe to run an amp in a semi truck I took a huge interest in this amp over my Midnight Special 250 toó bulky this 503 HD looks slim enough to put over my cobra 29.

[@thesuccessfulbarber]

I used 100 watt amp in my wife's car and it put it in limp mode

[@927JEL]

Would this amp be compatible with a general lee?

[@silverado1557]

Getting back into the hobby after 30 years. Have DX 959, power turned down so I have 1 1/2 watt dead key on low power. Peaks at about 7 watts on am, about 25 watts peak ssb. Is the KL503HD designed for more powerful radios? What mods would be required on my 959 to run this? Or would I be better off going with a KL 503? Thanks in advance!

[@irvynramosgarcia6958]

Tu radio en esas condiciones no le hará nada a ese amplificador.

[@mikestone9129]

You'd be fine with the 503 HD or standard 503.

[@joerowland7350]

Wood this b a good mach to a Lincon 2 ?

[@mr.stonerUDX714]

awesome unit

[@pearsoncontractingllc9587]

Seems crazy to me that they call this an "hd" when it only takes just a couple more watts of input than the standard 503.

[@scramick]

Hi Rooster, I have a Stryker 955HP with the KL503HD. On the 955, I have the PWR set at 12 o'clock. I understand that it still has the potential to PEP over 35 watts anywhere the PWR dial is set. Is this a good spot to put the PWR without damaging the amp? Thanks!

[@Rooster_Radio]

@@scramick I wouldn't recommend running that amp and that radio together. You're just asking for disaster

[@scramick]

@@Rooster_Radio Shoot. What amp would you recommend? Or a use a different radio?

[@Rooster_Radio]

@@scramick either or. A 4 pill 2879 amp if you change amps or a lower power radio. McKinley, TRE top one, a stock AT5555 something like that.

[@scramick]

@@Rooster_Radio Thank you!

[@ralphcintronnjr9869]

hello Mr. rooster how much for one of those 503 hd I need for my mobile I'm gonna run my cobra 148 nw soundtracker

[@borri68]

Are linears listed on your site? If so under what? Thought I found them before.

[@Rooster_Radio]

They're not

[@davewatson2829]

Would be nice if they indicated what Transistor Complements also what Voltage was you putting into it I'm sure if 15V was put into it A noticeable change

[@bradsmith9561]

Do you have any of these in stock? Or the regular 503?

[@justinlewis2598]

Sweet. I’m interested.

[@darktreatnyc1]

How come you never show how you hooks up the amplifier to the radio

[@Rooster_Radio]

Not difficult. Amplifier has an input and output. Input comes from the radio, output goes to the antenna

[@AttackPlan]

How do I get my hands on one?

[@sergiodmota]

A minha está com estacionária alta somente em ssb, o que pode ser?

[@GaryLordsWayMinistry]

Transistors are not covered due to high wattage input or high SWRs on an antenna as well. Get a camera and a tripod for crying out loud.

[@Rooster_Radio]

Buy me one 😉

[@jeffhouse4377]

Hi Rooster, I have a 503HD and was working ok but now the audio is distorted. Would you says the mosfets are damaged? Thank you!

[@Rooster_Radio]

Did you power output decrease?

[@therealwolfspidertoo]

Does this company make an amp for 1.8mhz - 30mhz HF?

[@ChristiannTyler]

So that’s peak power not average power when it comes to the Recommended drive ? So you can’t have an average power of 30 watts and drive it into the amp

[@Rooster_Radio]

35 watts-40 watts top peak. Deadkey 2-3 watts. Forward average power 10-12 watts max

[@aol767]

FCC rules protect sales and usage to transmitt w a cb linear ,during riots, wartime, Emergency, shoot skipland, any regular type reasonable ways.

[@davemiller7690]

Can I use this amp behind my Anytone 5555n2 safety without over driving it?

[@Rooster_Radio]

All depends what your radio does for output

[@allanvarner8137]

What kind of watt meter is that I like it kiind of looks like the old bird meter

[@Rooster_Radio]

Bird 43p

[@gaetanmicallef2135]

Does this amplifier suit my YAESU FT-DX 1200 - HF transceiver?? Please help me !

[@Rooster_Radio]

Does your yaesu do 35 watts peak/PEP

[@gaetanmicallef2135]

My rig is an HF TRANSCEIVER used by qualified RADIO AMATEURS , not CBers !!

[@gaetanmicallef2135]

Its output is 100 WATTS.

[@haroldboognish]

@@gaetanmicallef2135 Probably won't work very well for AM because the radio isn't set up with much AM PEP. It would work on FM and SSB, you will need to adjust the RF output, but you should know that already. What is a qualified RADIO AMATEUR doing looking at lowly CB radio amp videos lol? Get you an Ameritron and buzz off Gayton

[@7972david]

How do i purchase 1 from you

[@mitch5077]

What's your experience with RM Clones? I heard the 100 watt's can be from China?

[@Rooster_Radio]

Never had any of the clones

[@mitch5077]

@@Rooster_Radio Ok maybe just rumor's. Thanks

[@trondyne3513]

When they talk about max input do they mean peak or avg?

[@Rooster_Radio]

Peak on these 35/40

[@trondyne3513]

Thanks... So if I set my Richard for that it should be ok yes? (KL 503 no HD) @@Rooster_Radio

[@bionicrooster5762]

Rooster can you put a wall plug in on these? I know you have to supply your own cord. I want to use it on a base setup. Just don't want to buy another power supply unless I have to.

[@Rooster_Radio]

They are dc amps not AC, so the answer is no. Power supply only

[@bionicrooster5762]

@@Rooster_Radio ok thanks.

[@andrebonin7222]

What does go bye??? $$$$$$$$$$$$$

[@havennewsome4281]

hi do you have any kl 503 hd for sale???

[@turboomni848]

Can you run these HD's with a factory stock radio like the President McKinley? Thanks

[@Rooster_Radio]

Deadkey needs to be 3 watts or less and with a stock radio you aren't going to see max output.

[@turboomni848]

@@Rooster_Radio Thanks ,how much pep you need for SSB? Mine does 12 watts or so ,is that enough? I get the feeling with a stock radio the non HD kl-503 would be better for me? Love your channel, subscribed and watch often.

[@eri197395]

Need one how much how many whats its o

[@scramick]

I have a question for you about running SSB mode. When I key up, the TX light does not light until I talk, and then it turns on. Is this normal? Also, when I am done talking, the received signal is low, and then a second later, it is fine. Is that normal as well? Only on SSB. Thank you

[@Rooster_Radio]

@@scramick yes...

[@scramick]

@@Rooster_Radio Thanks Rooster!!

[@SEPU03]

Hi I would like to know if you think I could run a Italy with Galaxy 959T2 big rig series radio

[@Rooster_Radio]

No

[@AndrewKernohanDLC]

Can I put the 503 HD in my 2016 Dodge Ram Sport without damaging the alternator or battery? Thanks

[@Rooster_Radio]

Yes shouldn't be an issue

[@TheJaybird67k]

Can you drive this with a RM Italy KL 35 with stock Cobra?

[@Rooster_Radio]

I wouldn't

[@nevilleberghofer6791]

i woud like to see you do a review useing ssb as what you have done is only halfe the job as a lot of people use ssb for DX so why did you only do halfe the job not good at all and not satisfied with the review and i am sure RM would not be satisfied either

[@Rooster_Radio]

Not sure I really care? Not like I was paid by RM for doing a video or you? So why I should really care what you think is beyond me. Don't like review? See yourself out the door. The only difference in performance is the ssb delay, you mindless twit. Driving it with the same peak power will yield the same result of output power. There's your free lesson for the day. Do you approve?

[@nevilleberghofer6791]

problem solved unsubscrbe from an arrogant egotisticle jerk

[@Rooster_Radio]

@@nevilleberghofer6791 thank you for the favor. Imbecile

[@cortneyrogers1169]

Ok so I want to get me one 503 HD with a 30 amp power supply I'm using a radio that dead keys 4 watts would I have to turn wattage down to keep from over driving,I have no variable power so it would go to a shop if needed. thanks!

[@TwistedFXgaming]

Ok so whats a good radio to drive this driver with? Like a Galaxy 959 with both finals or a Galaxy 99v?

[@Rooster_Radio]

959 is a single final radio. With a good tune it would be a perfect match

[@BobbaZibby]

Thinking about purchasing, What are the true dimensions including heat sink?

[@Rooster_Radio]

Roughly 12x7x2.5

[@BobbaZibby]

Purchased. Can’t seem to get over 200 watts. Do you have any suggestions?

[@Rooster_Radio]

@@BobbaZibby what radio are you using and what is the output of it

[@BobbaZibby]

Galaxy 93T. Running the radio on high.

[@Rooster_Radio]

@@BobbaZibby well... A galaxy 93t is a turbo radio with a built in amplifier. It's a wonder you have an amplifier at all. The 93t well exceeds the 35 watt PEP recommended in the manual and that I have also stated countless times in these videos

[@brianswem1656]

What stock cb would be best for this amp thanks

[@Rooster_Radio]

No stock radio will drive it to full power. The 203p would be better for stock radios

[@davidbrennan5]

What is a good radio to use box stock with this amp?

[@Rooster_Radio]

You probably aren't going to get maximum performance with any stock radio with this amp, but something like a McKinley would be ok

[@davidbrennan5]

@@Rooster_Radio ok thanks for the info. I wasn't sure how much wattage to drive it with, some folks I talked to said to keep it under 30Watts.

[@Rooster_Radio]

@@davidbrennan5 these will take 35 peak. Regular McKinley does good after being tuned. Not quite 30 watts

[@davidbrennan5]

@@Rooster_Radio ok, thank you for your time.

[@ChristiannTyler]

What’s the biggest gauge wire you can get in that amps terminals?

[@Rooster_Radio]

8

[@ChristiannTyler]

@@Rooster_Radio thankyou also do you recommend a certain length jumper from radio to the amp?

[@Rooster_Radio]

@@ChristiannTyler anything over 3ft

[@ChristiannTyler]

@@Rooster_Radio I’m sure your busy but is there a brief explanation of why to use over 3ft? All mine are 3ft, just curious.

[@Rooster_Radio]

@@ChristiannTyler sometimes 3ft jumpers will cause oscillation issues, making relays stick in the amp, keeping the amp keyed etc. Not always, but sometimes.

[@Robalo844]

can you test it on radio on ssb

[@Rooster_Radio]

They will do the same on ssb with the same drive

[@harrybatt998]

@@Rooster_Radio Do these sound OK on SSB, do you know?

[@therealwolfspidertoo]

Does it need a fan?

[@Rooster_Radio]

Depends how long winded you get

[@tennesseevolunteerwrestlin192]

does the amp work on fm?

[@Rooster_Radio]

Yes

[@jasonblessing3644]

Where you get these frot

[@jasonblessing3644]

From

[@ryantyre1]

@rooster do you have any of these 503 HD in stock? I think this would fit my galaxy 44hp and stock power set up nicely.

[@joeythompson3579]

Is it clean does it splatter

[@Rooster_Radio]

Splatters all over like the Mexican food you had for dinner last night

[@highwayman1224]

@@Rooster_Radio 😂😂😂😂😂😂

[@fbsocialsitesecrets]

@@jamesvw769 you crack me up. Keep checking KZbin, I'm sure you've missed an amp video you haven't commented on about the legality of these products 😂

[@charlessalard4636]

Mine clean.

[@waltergurtner8017]

In der Schweiz verboten 73/55 QRP

[@Mr_Meowingtons]

it's a Joke they have 1 Driving 8 in there Every unit i have seen i need to remove and bypass the Driver in them and then they are Clean

[@Gw0wvl]

The pre amps are less than useless ... They are untuned , So very wideband and prone to cross modulation and mixer products .

[@patrickryan8168]

No 1 would ever notice or hear or see a difference in 300 watts to 350 watts.😂

[@Rooster_Radio]

No, but if you're using it to drive another amp, asa many do, it could be a more significant difference

[@iraceban1079]

@@Rooster_Radio Can it be used as a driver? What is the lowest power output obtained ? Thanks

[@netautorisationnetautorisa545]

! i know you used "real big stuff" ...he !

[@sponduli]

I can't get that stupid adapter piece off the back

[@netautorisationnetautorisa545]

*300W ...HEHE MAYBE ... A **#BIG** ONE ..(I MEAN REAL POWER .. SAY HELLO TO **#ALL** )* HAVE A GOOD DAY/NIGHT ..MISTER *EUROPE DENMARK* (we must have some fun time .... we are still alive !!)