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Old 12-20-2010, 01:14 PM
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Just found a mobile 300 watt Black Cat amplifer at a local flea market ???/I know it could be fried but just curious if anyone has any info on this unit? Have searched hi and lo and nothing but a JBM name and they are really hi dollar units..Back to the person who is selling it and he is our local PC guy and will give me a guranatee that it will do what he says? Just curious and would like to read up on it befiore i buy it ($90) Caould always use a standby for that price!!!!
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Old 12-20-2010, 02:00 PM
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I had a coworker give me a Kopy Kat amplifier a few years ago. It worked OK, wasn't anything to write home about, but the problem was the method used to convert 12v dc to the higher voltages needed for the tubes produced a very loud and annoying audible squeal. The only way to keep the squeal from being transmitted in the audio was to locate the amplifier in the trunk.

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Old 12-20-2010, 02:55 PM
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Those amplifiers are a typical boomer / palomar 250 / 225 and you would see about 160 - 180 watts I believe it was 2 x SD1446 transistors They were between $80.00 and $100.00 new Ill have to look around here I believe I still have info on these from when they first came out. They were avaiolable for a year or 2 then I didnt see them anymore or I didnt notice them.

If they sported 2 x SD1446 or even if they would have used 2SC2290 transistors they are not going to do 300 watts as the model number would state.
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Old 12-20-2010, 03:18 PM
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i would pass on the flea market special for $90 unless i knew for a fact that it works like it should.
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Old 12-20-2010, 03:27 PM
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big 10-4 on what the model said about the 300 guy and thanks again for the info and its not worth the 90 bucks and even thou its a solid state amp. Since it falls into the class c amp of palomar cobra etc and again WWDX thanks for the answers i have recieved

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Old 12-21-2010, 09:14 AM
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The current 'batch' of amplifiers coming onto the scene (for the last 15 or so years, mass produced) can pretty much be counted on to be INPUT power.

The 300 you're talking about takes 300 watts INPUT from your power supply to create the 150-200 watts output. Peak.

Marketing ploy, sure... Useful, if you know how to 'interpolate' the actual numbers into a meaningful number for You.

The OTHER problem I've found in those amps is this: The ferrite in the output transformer is wrong. Key up for 30-45 seconds to test... You'll watch the output fall off DRASTICALLY!

I thought I had a problem with a bigger amplifier until I realized it was the predriver falling off in output power. Replaced the xformer, no mo problems. They work GREAT as a 6 meter amp WHICH IS WHAT THE SD1446 WAS DESIGNED FOR!!!

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Old 12-26-2010, 01:27 PM
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I guess what your telling me that if i apply the power formula ...it would only tell the amps that it would generate at the full wattage? but I can find no reason to use this...I guess? Thanks for all the info

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Old 12-26-2010, 01:33 PM
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After reading your last post, I'm telling you to do a little research, learn about input power, output power, efficiency, etc.

It's a bit more complicated than me throwing a couple sentences at you.

BUT, since you stated you'd have no use for such information, I can tell you have NO idea about how an amplifier works. They aren't rated in amps.. They are rated in watts.


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