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  #1  
Old 11-23-2009, 01:45 PM
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Default KLV-550


How can ya tell if a pill is bad in a KLV-550.
All I can get out of it is 275 watts.
I have tried five different radios that dead key 2 watts and swings to 15.
When I lived in NJ my friend got 550 watts out of his driving it with a Cobra 25 dk 2 watts and swing to 10 watts.
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Old 11-23-2009, 02:00 PM
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What does the SWR look like?
That would be the first place I would look.

I just did a little research on this amp.
It appears that this particular amp is prone to failure/damage if the SWR isn't nearly ideal.
Overdriving it - I don't think you did that - would also create damage. They are a bit sensitive - I guess. Never owned or used one myself. Just Texas Star and Palomars.

"...RM KLV 550 transistorised mains amplifier
A solid-state (transistor) amplifier which is powered directly from the mains.
Output power is variable in 6 stages, giving outputs from approx 50W to 300W (depending also upon input). There is a variable 26dB pre-amplifier.
The front panel also has a 13.5V outlet with a maximum current of 3A. This is suitable for powering a low power radio or various low power accessories.
This has the advantage over it's valve equivalent of giving instant output (no warming up) and requiring no tuning.
The disadvantage is that transistors are much less tolerant of a high swr and will blow if the swr is too high..."
-KnightsCB-UK
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Last edited by Robb; 11-23-2009 at 02:13 PM.

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Old 11-23-2009, 03:18 PM
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My swr's are below 1.4 with the amp on.
Thanks
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Old 11-23-2009, 03:22 PM
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Quote:
Originally Posted by Oldtimer View Post
My swr's are below 1.4 with the amp on.
Thanks
Does the SWR get worse than 1.4 as you talk/modulate?
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Old 11-23-2009, 03:44 PM
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Nope!
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  #6  
Old 11-23-2009, 05:17 PM
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You wont see much more out of that amplifier I see between 300-400 if you know anyone looking for one I have one Ill sell I dont use it but I will say its a nice sturdy amplifier.
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Old 11-24-2009, 04:35 AM
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I'd say there is nothing wrong with your amp. RM's model numbers are not indicative of the units' power output. (Shoot, they named their 2 by MRF455 amp the KL-400!!!!) My 550 with do about 250-260 on AM and right around 300 SSB. But it sounds like crap on SSB---either it is class C, or mine has some issue with the bias.
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Old 11-24-2009, 08:32 AM
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i agree with tony and highlander, you dont have a pill down, the kl550 only manages about 300w fm or ssb with 10w drive,

they sound poor on ssb because the antenna relay switches before the bias circuit, ssb audio starts with no bias at all and drops back to no bias between words and syllables,
the bias circuit is not stable when it is switched on been fed from the main unregulated dc supply that swings from around 30v at low drive levels to around 25.5v@300w,
when bias finally turns on it turns on too high but falls back as drive level is increased,
the onboard regulator circuit would be much better used as a regulated supply for the bias circuit,
the psu has nowhere near enough reservoir capacitance for an unregulated or regulated supply of that current,

i posted a quick fix a while back that allows the bias to turn on just before the antenna relay ensuring class ab operation at all drive levels and distortion free audio,
heres a pic where i tacked a variable resistor in to test the idea,

KL550 BIAS FIX pictures by ukmudduck - Photobucket
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