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# 10 wire plenty big enough for power to KL503HD has 3 10 amp fuses in it

D104 set to o and radio on 31 mike gain, check freq of your channel could be off freq , not hard to do with this radio put on channel you want and hit freq button if wrong dial in correct frq and then back to channel button

Use your KL503HD with selector switch around the 3 or 4 setting less dead key but lots more swing out of box , been using mine for around 2 years now. I drive with a 5555N11 set at 8 watts dead key and kl set at number 3 position and I get 250-275 watts out of it and sounds very good & strong...

Look in back of Manual for schematic

88 Radio has RM3 & RM4 for sale

seller 88radio tells me rating is P-P rating of HD version, I just using a 5555n11 put in 25 watt dead key and got 450 watts P-P out of it. I run HD with around 8-9 watts dead key and P-P is around 35 watts ,with KL503HD connected and swith in 3 rd position I get 250-275 watts been using this...

I bought one several years back, mounted on tool box of Nissan frontier mwas adjusting SWR ,hear guy from Road Island breakin. I'm in South Carolins Cental. Said He was checking flat side of his antenna. I talked with him on my GR45 no problem I had very good copy on his Flat side antenna.

88 Radio on the web sells KL503 and they have power transisters for $8 dollars plus shipping

I have bought 5 times with no problem, based in California received within a week of ordering.

no more than 1.5 watts from radio into a KL203 will give you 85 to 100 watts output . I have several and have used them and friends good linear if used right

must not be set up correct mine sound fine in AM or SSB and put out around 250 watts P -P no more than 35 watts P -P input

I have 4 of them, work great drive up to 35 watts P to P and you will love this amp

I have bought 5 KL503HD from them before

tot is a timer to shut radio off for you

swr is high radio will shut down no transmit

mash center of channel selector to flash and then change setting and mash again to accept setting

Been using for 2 years,a very good linear if used correctly, well built, used the KL503 firsts then the KL503HD drive with a 5555N11 at 35 watt PtoP power and it sounds great to every one I talked with. P-P watts 225-300 watts and Dead key around 8 watts with KL503HD using 503 use 1.5 to 2...

Been using for over a year now on base and mobile HD version no problems except 2 in truck lost preamp but linear still works great . puts out 250-300 with 35 watts PeP ,using 5555N11 radio with around 8 watts dead key.

nice linear, been using for 1.5 years on base and in my truck,88 Radio says they are back in stock .,ordered another today 4/27/2023

yes open up cut white wire and move jumper from 1&2 to 2 & 3 magic on 27 Mhz