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I need some help
- Thread starter Griza
- Start date
It would really help if your picture was a much higher resolution, and you had some pics all around and inside.
Check the file size setting in the camera settings. It's gotta be set to a very small size.
griza,
the two most important pieces of information you can provide that will allow us to give you a realistic estimate of the amp's value, are a good pic of the inside, and a test that it actually works.
LC
the two most important pieces of information you can provide that will allow us to give you a realistic estimate of the amp's value, are a good pic of the inside, and a test that it actually works.
LC
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
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
it's sat in my closet for over 10 years, it was my grandfathers, there is large amount of dust on the board, I would like to clean it off before turning it on. you have and recommendations on a product to wipe it down. I'll send some pics inside once its cleaned, and I'm almost 100% sure it will power up. I know it was running just fine when he passed
I'm not a tech, but I would guess those are diodes and that is the rectification circuit?
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@ BJ radionut:
HEATHKIT SB220 Used [.20462] - $999.00 : R&L Electronics, Amateur radio store
R&L Electronics HEATHKIT SB220 Used [.20462] - HEATHKIT SB220 MODIFIED TO ONLY WORK ON 6 METERS TESTED, HEAVILY MODIFIEDwww2.randl.com -
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@ benc48:Need help lost my channel chart . Cobra 148 GTL with a 8719 and 11,1125 crystal 26.175 to 28.045 , Need the chart I can fill in the blanks slide 2ck up and 12 kc down
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