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Difference between standard transistor and horizontal deflection transistor

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WyverntekGameRepairs:
I have built myself a really nice audio amplifier using some old parts at my college (I'm in industrial electronics, and our college campus has workshops in it). Now, when I say old, I don't mean 2001. I mean 1980's, late 1970's old. Those large bumblebee style resistors are one of the most common resistors you can find in the parts drawers. Yeah, pretty old. Anyway, I found a couple D1453 transistors, which are meant for colour CRT TVs, as well as a couple MJE3055T transistors. I also found a 2SC2773 transistor that is meant for audio and high-power switching / amplification, and decided to pair that with a ECG2315 NPN Darlington transistor (for the record, Darlingtons are my absolute favourite).

When I paired the ECG2315 and 2SC2773, I got really nice (and really loud) results. When I paired the MJE3055T and D1453, I got almost the same results - except for the distortion being more noticeable as I adjusted the bias on the 3055. When I paired the 2315 and D1453, the distortion was fairly more noticeable.

I know a lot of other people ask these same questions, so I'll ask a few of them here for anyone who is curious or is getting into the more unusual transistors such as the horizontal deflection output transistors:
1) What is the primary difference between a typical general purpouse transistor (e.g. 2n2222a) and a horizontal deflection output transistor (such as the one I am using), other than voltage handling?
2) Other than CRT TVs, what applications can these HDO transistors be implemented into?
3) What is the best way to describe the behaviour of a HDO transistor?
4) What are some of the primary advantages and disadvantages of HDO transistors when compared to standard transistors?

Thanks!

Colt45:
High voltage mostly, with decent current and switching speed. Not really characterized for linear operation, and it probably sucks at it due to design compromises.

Sometimes built in damper diode, like yours.

m3vuv:
do you mean a line output transistor?

wraper:
They usually have resistor between base and emitter, ~30-50 Ohm. Linearity is not the goal, so YMMV. Also they are made for high voltage and not so high current, so not really suited for audio amplifier.

Kleinstein:
The horizontal deflection transistors could also be used in a mains powered SPMS. The horizontal deflection is not that much different from a flyback SMPS.

However for SMPS use they are replaced by better performing MOSFETs.

As high voltage switching transistors they have a poor current gain and the power handling capacity can also be limited in linear use. The current rating can still be reasonable useful.

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