Let's get this gem up & running again - Siera 5521 / Philips 22RH521 - Part 2

The next step in the restoration of this wonderful vintage amplifier.
The replacement output transistors have arrived. In this video we'll fix the blown left channel and rebuild the power supply.
WARNING: Do not attempt to repair electronic equipment if you don't know what you're doing.
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Music by Karl Casey @ White Bat Audio
Noise video footage by Milan Matos
Electrocution logo by Nesdon Booth, The Noun Project

[@tubeDude48]

That series resistor for the pilot lamps...I'd change it out for a higher wattage if it's getting hot.

[@migsvensurfing6310]

Usually you would want to have a set of paired transistors for the output.

[@yourbiglebowski]

Extra leads zijn waarschijnlijk gemaakt als aansluiting naar MFB luidsprekers.

[@Pico_Farad]

Audio caps? You fall for that? Dave from EEVblog has a video debunking that. Caps have a capacitance, obviously, and a maximum working voltage and temperature. That's it. No "suitability for audio" thing. Dave called it audio foolery.

[@retro_tech]

Caps also have an impedance, which can depend on the frequency of the signal applied to the cap. There is a reason why some audio gear uses tantalums in the audio signal path, for example (low ESR). I think it makes sense to use a component which is actually designed for the purpose it has to serve. I also think it's weird that people have no issue accepting that there are caps designed for purposes like high ripple, high frequencies, low ESR or long life, but don't accept a capacitor can be optimized for audio frequencies.
It's true that there's a lot of quackery in audio components. In general I use Nichicon UFW caps in the audio path, which are Nichicon's cheapest "audio" rated capacitors. They are barely more expensive than regular Nichicon caps, so why not use them?
I'm less convinced about the more expensive and "high end" audio- rated capacitor ranges. I don't believe anyone would really hear the difference between the UFW range and the more expensive ones. But if anyone can show me there's an actual difference in the resulting audio, I'll gladly change my mind.
So let's say I partially agree with you.