My 'two bobs worth' regarding tyres and Thyristors.

a) A co-worker during the mid-80's imported Michelin tyres for his vintage automobile. He claimed that before fitting them he would
cure them by wrapping them in paper and storing them under his house for twelve months. they would then outlast anything contemporary.

One problem---they were so hard that he would not have enough traction for emergency braking, they would slide instead.

b) Thyristors. I cannot recall ever having to replace one in a CTV using thyristors in deflection stages. However, I can remember that most
components which coupled, decoupled, biased or dampened thyristors often came to grief.

Tyres are not all tyres, suitable for everything. I am baby sitting an Audi Quattro. It has already wiped out one tyre whilst the owner was driving it and my 323 Mazda has also wiped out a new one, as did another A4 driver I met getting hers sorted. All caused by crap rural gravel roads with over sized sharp rocks on them, that councils should be banned from using. Doughnut tyres are easily punctured or "side walled" on this type of road.

The hard tyre is really not suited for bitumen, & tyres do have a time limit even that the tread is ok. one tractor tyre here is from 1968, it is chunking & if it gets a puncture it's finished. If it gets used for heavy work it will also be finished.

The best tyres for the individual vehicle and the crap roads are on the 58 Zephyr ute. Whilst steering suffers from the design of the front end and you have to keep chasing it (cross ply tyres were a curse on it) light truck tyres win out. Its suspension is more shock absorbing with those tyres & actually quieter than the other two as those tyres are able to absorb the shock to a considerably greater extent than the others.

That Thyristor & mechanical vibrator in power supplies look like they are a bit like a valve, where most of the time they keep going while everything around them leaks, is out of tolerance, or punches through.

Yes thyristors are by design virtually indestructible but Marcc you are right, the very high di/dt they create is hard on the parts around them. Consider a 1μF capacitor being charged to 500V and discharged in a few nanoseconds into almost zero ohms, 16,000 times a second.
Tough gig.

I have Bridgestone Turanzas on my Commodore. They stick like solids to a blanket, are cheap, quiet and handle gravel as well as blacktop and concrete. If I was driving a ute or van I'd use light truck tyres every time, they handle the weight better.

Very good Brad. I've never heard it described that way.

Yeah, I did think about saying it the normal way but even admins should obey the rules.

The Thyristor would have a lot to do with the Electric fence units here, which probably use them, both date into the eighties. The more powerful one had a new cap early in its life, but has not failed since. Both run 24/7 at around a pulse per sec. The cap is a physically large one, obviously pulse grade, 20μF non polarised 900V; smaller cap in the other one, but consider how many charges & discharges that amounts to.