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Kevin Aylward[_5_] Kevin Aylward[_5_] is offline
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Default Tube mono-block amp with SIX 6L6 outut tubes

"Big Bad Bob" wrote in message
...

On 12/28/18 09:16, bitrex wrote:

All amps of that scale should have active protection circuitry/monitoring
of currents, biases, and temperatures via microprocessor to avoid
potentially catastrophic faults.


Even briefly overvolt or overcurrent on a typical transistor, and you'll be
replacing it VERY soon. I made the mistake of designing a circuit that
operated close to the maximum Vceo (these 60V transistors should be able to
handle 45-50V right?), and the transistors never lasted long under load
(replaced 3 times, and 3 blown fuses that were supposed to protect them).
Replaced with transistors that had twice the Vceo and no problem.


Well... overcurrent on a mosfet output device is usually pretty safe for
quite a while. Second breakdown is the problem with bipolar. Their rating at
high voltage is much lower than their power ratings would imply.

I designed mosfet amp in the early 80s. I tested it by putting in a full
level signal with an output s/c. The only protection was a zener across the
gates to limit the current to the device ratings. I left it cycling with its
90 Deg heatsink thermal cutout for 3 days. No problems.

-- Kevin Aylward
http://www.anasoft.co.uk - SuperSpice
http://www.kevinaylward.co.uk/ee/index.html

 
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