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Blimey! I said KT66s because they’re normally that tapered shape and KT88s are normally more of a Coke can shape (and size). I’d definitely be up for a forum listening party (and put me down for coffee tasting) if you’d be up for hosting one.
Your 9V batteries are probably for a non transformer-based biasing. It’s an old way of doing it but I’m guessing low noise and probably means you don’t need to use diodes or LEDs to get a simpler but more stable bias voltage.
Jonny69-
It would be lovely to have everyone here for coffee and records. Might have booze too if I can get the paperwork done for licensing.
Thanks for the explanation about the batteries. I like listening to this equipment and it annoys me that I can’t understand the technicalities, I watch YouTube videos about people mending electronics all the time but I still can’t get a handle on how this stuff works.
Stevethecoffee
KT88s in these ones. They’re Kora Cosmos power amps, 100wpc class a (!) triode. The matching pre-amp is valve state too, I haven’t opened it up to see what the valves are. It also has an outboard power supply. The phono stage is a kit build (not by me, obvs) PH15 valve state job with Sovtech valves and a pair of 9v batteries for something or other. I don’t know what spec the valves are.
I have owned a Kora Jupiter stereo power amp for a few years and it’s absolutely perfect, I’ll never part with it. I took a punt on it second hand having never heard of it and with no info about it anywhere. I had a saved search for the matching preamp which came up the other weekend. The seller also had the monoblock power amps so I had to go for the set. He did a good deal for the package.