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BBI amps, anyone heard of them?

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  #9  
Old 06-20-2013, 04:58 AM
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You can tell by the way it was carefully placed a quarter inch from falling off the shelf to make it in the picture that it's probably a dud. The 8877 can easily be converted into a paperweight. Feed the cathode without raising the filament above RF ground or over dissipate the grid and say bye bye. It's got plenty of gain to destroy itself if misused or if Eimac is having a bad decade like the 1980's when they sold thousands of defective 8877 tubes.

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Old 08-28-2013, 03:49 PM
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Well here this should help. this is from when I tested the amp, back when I built it.

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Old 08-28-2013, 08:30 PM
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When you come up with a nice regulated class AB amp you will be on to something. A good AB amp is hard to find these days.

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Old 08-28-2013, 08:54 PM
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I would like to see a DC current meter, voltage meter and power meter all in one shot. That will be the true test of linearity and performance. A Spectrum analyzer shot out to the 5th would be nice as well.
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Old 08-28-2013, 09:18 PM
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I have built in class "b" and ab1,ab2 and 1a. but I do it all here is a Ameritron I did about a month ago for a guy in spain. I built a nice little 4cx350b box this last weekend. anyways u all have a nice night

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Old 08-28-2013, 10:24 PM
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Quote:
Originally Posted by Mr BBi View Post
I have built in class "b" and ab1,ab2 and 1a. but I do it all here is a Ameritron I did about a month ago for a guy in spain. I built a nice little 4cx350b box this last weekend. anyways u all have a nice night

I am quite familiar with class a, ab1, ab2, b, and c but what is class 1a?
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Old 08-29-2013, 02:11 AM
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good point... what is 1a? lol a1 is what i was talking about..

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Old 08-29-2013, 08:18 AM
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Will you be able to post a vid with current draw, voltage and power meter measurements?

Also in your video you mentioned "with this technology" What are you doing that is different from other builders? Using pad on input to present a 50ohm resistive load? High quality input transformers?


PS, I def. like the compact design and fan arrangement. Im also surprised you dont have any tuning issues with the transformers in that close of proximity to some rather substantial metal. I just wonder if the fans will dissipate enough heat. That also depends on the efficiency, hence my interest in volt and current readings.
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