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That particular amplifier is a hot rod. Not a big hot rod, but it hovers around or just past the red line, in a manner of speaking.

Bearing in mind we don't know how 'original' it is on the inside, I'm just offering an educated guess.

It uses an unregulated power supply. The DC voltage that it puts on the transistors is well above the rated limit. This will work just fine for a while, so long as no major stress is applied to it. But if it is keyed for a little too long, or with a little too much drive power or with a bad connector/coax in line with the antenna, things break. Naturally this is true for all linear amplifiers. But this one has a smaller-than-average safety margin.

If it still works okay, we can be sure of one or the other of two things: Either the guy who used it understood the limits and respected them, --OR-- it has very little mileage on it. No odometer to read off to tell that.

And if it has been modified since it was built, all bets are off making predictions about it.

73

<blockquote data-quote="nomadradio" data-source="post: 805844" data-attributes="member: 22">That particular amplifier is a hot rod. Not a big hot rod, but it hovers around or just past the red line, in a manner of speaking. Bearing in mind we don&#039;t know how &#039;original&#039; it is on the inside, I&#039;m just offering an educated guess. It uses an unregulated power supply. The DC voltage that it puts on the transistors is well above the rated limit. This will work just fine for a while, so long as no major stress is applied to it. But if it is keyed for a little too long, or with a little too much drive power or with a bad connector/coax in line with the antenna, things break. Naturally this is true for all linear amplifiers. But this one has&nbsp; a smaller-than-average safety margin. If it still works okay, we can be sure of one or the other of two things: Either the guy who used it understood the limits and respected them,&nbsp; --OR-- it has very little mileage on it. No odometer to read off to tell that. And if it has been modified since it was built, all bets are off making predictions about it. 73</blockquote>

[QUOTE="nomadradio, post: 805844, member: 22"] That particular amplifier is a hot rod. Not a big hot rod, but it hovers around or just past the red line, in a manner of speaking. Bearing in mind we don't know how 'original' it is on the inside, I'm just offering an educated guess. It uses an unregulated power supply. The DC voltage that it puts on the transistors is well above the rated limit. This will work just fine for a while, so long as no major stress is applied to it. But if it is keyed for a little too long, or with a little too much drive power or with a bad connector/coax in line with the antenna, things break. Naturally this is true for all linear amplifiers. But this one has a smaller-than-average safety margin. If it still works okay, we can be sure of one or the other of two things: Either the guy who used it understood the limits and respected them, --OR-- it has very little mileage on it. No odometer to read off to tell that. And if it has been modified since it was built, all bets are off making predictions about it. 73 [/QUOTE]

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