RM Italy KL7505 Look Through & Repair - [FCC Certified]🧐

[@jethrobodine9617]

I use to own one of these.... Ol memories... Lasted just over 2 years

[@1883GotDown]

I'm telling you man....I think imma try and repair more of these amps because they do test me and push my limits lol.

[@SDS-1]

I've actually thought about the combiner set ups in this way back talking to a builder I was learning from n the early 2000s. The silk screen on the switch panel does say "TX_EN" next to the jumper.

[@1883GotDown]

Roger roger......This will show you ma. That there are many ways to do things. When I saw this....My mouth just opened. Man.....I was like werehhhhhhh I thought I had seen it all till now lol. I drew a detailed schematic of it.

[@hitechrr]

I have the Schematic for that amp. That amp is my daily driver. I also have a texas star dx250 and a x-force base 200. I always go back to the RM Italy. My high low med works fine but I leave it on medium. I use the center setting on sideband. I don't think that that amp is sold anymore.

[@1883GotDown]

I finally found the schematic the other day and added it to my archive and yes this amp would make a great driver. These when biased, TS all are awesome drivers!!....Thanks for stopping by my channel brother and feel free to take a look around.

[@MrBonez208]

That blue solder sucker is a: DS017 The Original EDSYN Deluxe Desoldering Solder Sucker SOLDAPULLT Made in USA I also recommend the SX951 loner iron! I seen them hold up for 25 years on a military production line ran 24 seven 365! That’s saying something for the heater! Its wand or heater is replaceable for less than $50 retail!

[@1883GotDown]

Wow thanks for that info I'll look into that 👍 thanks

[@buckaroobonsi555]

I have heard that the owners manual has a schematic.

[@1883GotDown]

I finally found one when looking up where they got this idea from suposly....I added it to my archive

[@unclequack5445]

Oiling that tool makes it where air cant pass by the o-ring and of course it makes it last longer.

[@1883GotDown]

Inseed

[@petehanson6958]

Yep that 5 volt regulator is powering The Logical circuits

[@1883GotDown]

I believe you are correct sir.

[@tomkellogg689]

WR789 Tom Northern Idaho. Could you repair my KL7505 for me? I have the same problem. I can't find a replacement faceplate; thermal protection and fans need work. I can pay you.

[@MrBonez208]

7805 is 5v

[@1883GotDown]

Agreed

[@robertmeyer4744]

I have not seen this one. I had KL 506 and 300 ,did a few KL 203P . I got the tube base amp. KLV 1000 has 5 tubes. 240V 50Hz but just fine on 60 Hz. I bet a chip or transistor went bad on that face board pulling to much from 5V why the heat. What on that bord should not draw much 5V dc. That a low pass filter on output. may be 54Mhz and up. I wouldn't run that hard. that a trace board and not much heat sink or fan. and small pills. They all hard to work on. I got a working KL 35 . has a mosfet and no relay. diode switching .got it on trade. when amp is on it cuts the receive .Was the complaint. it's the diode switching that the problem . draws about 3 amps. most radios today do more than that amp. it's just a little thing. works great FM .does not make much heat at 30 watt RMS FM power. 73's

[@goldpipe2003]

I have a kl40 with the no relay switching when on no receive problem. The power switch was going bad in my case. The pass through what routed through the power switch.

[@1883GotDown]

That is really cool.... I am guessing it is using pin diodes for the switching maybe....I have a cheap cheap preamp from a truck stop here and it blew my mind that it used diode switching to switch and bypass the preamp....I thought that was the coolest thing man lol....I would love to play around with them one day....I drew a pictorial schematic of it for future reference.

[@1883GotDown]

@@goldpipe2003 this amplifier seems interesting....id like to get me one and study it :)

[@goldpipe2003]

@@1883GotDown yeah it took several looky Lou's at it make it work again. Pulling parts and testing. But that 7505 is really interesting needless to say how the two sections are combined.... Gots me thinking. 127 johnboy sc and we off the keyboard.🤘

[@goldpipe2003]

@@1883GotDown I mean is it two push pulls working in push pull? I honestly have been scratching my noggin about it....

[@bblod4896]

Flux is your friend 😂

[@1883GotDown]

Lol lol yeh I just watched that lol imma nutt lol lol

[@tonywhite846]

Email Andrew at rm italy. He will mail you a New front board, i have had to replace a couple over the years, The last one i replaced was on the kl 7505 fcc certified. It is not worth your time try to repair the board. Good lunk

[@tonywhite846]

LUCK............

[@Dazzwidd]

The TenTec model 420 amplifier used that technique many moons ago.. They power combined two amplifier modules using 4 pills just like this. RM are rip offs

[@1883GotDown]

I would love to see this amplifier.....now Ten Tec are some geniuses man....I have a titan over here that has two 800 in it that is just genius craftsmanship...imma look into that amplifier you just mentioned.

[@1883GotDown]

Thanks for stopping by my channel with that information....I just spent an hour looking at pictures and you ARE exactly right Ten Tech was the first to do this and theirs is a 8 transistor setup using this method. WoW that Ten Tech Hercules II is one machine my friend. I WANT ONE!!!! :)

[@Dazzwidd]

I think BBI did some videos on the Hercules amplifier. Anyway I used to own one. It had bigger than their standard issue transistors installed. I think it usually comes with MRF458s in it (not certain) but mine had SD1405 and it had a band switch setting that enabled it to go a little above 30mhz. I got the feeling it was used in a military application... maybe military mobile. That technique of effectively placing the output transformers in series is an interesting one and apart for a certain simplicity I wonder if there is other advantages like better harmonic performance. It certainly would be efficient if it's done correctly