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Old September 22nd 06, 01:31 AM posted to rec.radio.cb
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First recorded activity by RadioBanter: Jul 2006
Posts: 985
Default Amp Design Concept -- Preliminary

True, if you expect the transistors to never be replaced. But that's
not the reality with CB amps. The owners like to swap transistors for
more power. Either that, or they overdrive the transistors and blow
them up. Replacing them tears up the board, which is why it's hard to
find an old single-board amp with good traces. Point-to-point wiring
eliminates this problem because both the transistors -and- the strips
can be replaced. The servicable life of the amp is almost indefinite
irrespective of the amount of work done to it.


Transistors in amps normally have to be replaced because the amp has
matching problems or inadequate cooling... or both. Almost all the
bootleg amps I've worked with suffered from these problems. This causes
the transistors to run red hot... and it cuts their life drastically.

As for your statement about using point to point wiring... bad idea.
This causes stray inductances and capacitances all over the place that
cause RF oscillations. Oscillations contribute to failed power
transistors, due to the tremendous power dissipation that is present
during these oscillations. Many times these oscillations can't be heard
on the air and do their damage without the operator ever knowing why
the failure occured.

http://www.telstar-electronics.com/S...202879ABTC.pdf

 
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