RM Italy KL 503 HD - Anybody ever use?

[Lino Bob]

I likely will not ever own one. But, some locals out where I live run them and they do well as long as they are not overdriving them. For awhile some were trying to wring every watt they could get out to of them it seems and would distort some and they would bleedover. It seems they have all settled down now, backed the input and audio down and they seem a much better amp than I initially thought!

Bingo ! You hit the nail on the head with this comment . DO NOT overdrive these and they work great. I would suggest not inputting more than 10-15 watts PEP and they run very well. Just cuz you can run 35W PEP doesn't mean you should!

 

[Brother DXer]

Bingo ! You hit the nail on the head with this comment . DO NOT overdrive these and they work great. I would suggest not inputting more than 10-15 watts PEP and they run very well. Just cuz you can run 35W PEP doesn't mean you should!

Is this your experience with them?

I agree, 35 W PEP is definitely more than you need to run these. Keeping in mind, the info I'm posting is running SSB. I'm almost never on AM. But since putting my 503 HD inline, I've cautiously been doing some testing with input wattage and found the sweet spot at 20 W PEP and no more than 25. Again, I'll always error on the side of caution and stay around 20 PEP. This gets me 280 to 290 watts swing. 25 definitely gets it over 300 +.

Edit... I went back and tested 15 W PEP and got 250 from the amp. Not bad at all. I may just lower what I consider the sweet spot.

AM, as most people know is a different beast and you seriously have to be careful with the POWA...

73

 

[undertaker]

Dude put on your fire proof suit !!!! LOL!!!

 

[Lino Bob]

Is this your experience with them?

I agree, 35 W PEP is definitely more than you need to run these. Keeping in mind, the info I'm posting is running SSB. I'm almost never on AM. But since putting my 503 HD inline, I've cautiously been doing some testing with input wattage and found the sweet spot at 20 W PEP and no more than 25. Again, I'll always error on the side of caution and stay around 20 PEP. This gets me 280 to 290 watts swing. 25 definitely gets it over 300 +.

Edit... I went back and tested 15 W PEP and got 250 from the amp. Not bad at all. I may just lower what I consider the sweet spot.

AM, as most people know is a different beast and you seriously have to be careful with the POWA...

73

Yes this is what I do. It's a lot easier on the gear this way(runs cooler) and The reduction in power only reduces the signal a slight amount,on the order of 2 or 3 db, Not noticeable to most stations

 

[Sawdust]

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

How is 88 radio to deal with?

 

[Eldorado828]

How is 88 radio to deal with?

Many of us here have bought from them with plenty of success stories. I've bought radios and amplifiers from them myself and completely pleased.

 

[ForestRunner98]

How is 88 radio to deal with?

Got my 503 from 88 radio. Came in 2 days!!! They ship from Northern California.