The two OPTs are interleved. Together, the would make a PT that's 480V primary to 36V secondary, but in this case, they make a 1k:6R OPT that does full power at 30Hz.
Can you draw a conclusion from this?
Instead of a typical speaker transformer, use two normal 230/18, connected in primary and secondary in series?
Instead of a typical speaker transformer, use two normal 230/18, connected in primary and secondary in series?
in series (on secondary) but with interleaving ...
And it works well?
is it well matched? (at least computationally)
And it works well?
is it well matched? (at least computationally)
Where are you right now? Maybe I send you my 7 boxes with unfinished tube projects and humbly ask you to finish them ...😀
Actually I am in Chicago and will be back in Sweden by the end of next week. I did, before leaving, two weeks ago, dig up my Luxman clone and fond NINE 50CA10 tubes to go with it. The chassis is ready drilled and milled, I bring PSU caps back from USA and hopefully all components I purchased are still left.
Im in Baltimore MD for permanent.....I hope I will be in Chicago in Christmas...../You can send me Your stuff for finishing/
Works better than a real OPT IMHO. Especially if you're looking for low Ra-a (My monoblocs are about 1k Ra-a:6R with peak current of almost 1A on the primary).
Interesting lighting on the tube heaters/filaments. Is that a camera artifact or do they glow that white? In any case, nice amp!
Edit: And nice cat!
Thanks, as lexx21 said, tungsten filaments glow very bright.
Nice but personally I think I prefer the more discrete orange glow of usual tubes 🙂
Will be soon dismantled, it was just an experimentation, about 150W of heater power for a stereo PP is too much.
Nice but personally I think I prefer the more discrete orange glow of usual tubes 🙂
Will be soon dismantled, it was just an experimentation, about 150W of heater power for a stereo PP is too much.
Ask jan first has for sell YL1350, is an amazing modern valve with 80watt of dissipation with low voltage.
emk2,
To echo carlp's comment - that is a nice lighting effect, and cute feline friend. 🙂
P.s. The amplifier looks well built too. 😀
To echo carlp's comment - that is a nice lighting effect, and cute feline friend. 🙂
P.s. The amplifier looks well built too. 😀
Ah, that makes sense, thanks. And it's a DHP? (Directly heated pentode?) Not sure I've ever encountered such a beast. Anyway, that's one heck of a tube, though as you say, also a heck of a lot of power consumption! How did it sound?
Yes, a DHP but used in triode with only 400V B+ (fixed bias).
Impressive because big bottles and tungsten filaments but probably not better than a PP of KT66 triode connected in these conditions 🙄 😉
Triode curves here:
814 SE A2 Amplifier – Bartola(R) Valves
Impressive because big bottles and tungsten filaments but probably not better than a PP of KT66 triode connected in these conditions 🙄 😉
Triode curves here:
814 SE A2 Amplifier – Bartola(R) Valves
Oops.
They had a good 5 year run at 70c though... I bought these at the local electronic surplus/junk store when I was just starting to DIY tube stuff.
When it blew, it took out an 8R 5W resistor, a diode, and a 5A fuse 🙂 Apparently, the force of the blast sent it into the chassis and dumped the power supply to ground.
They had a good 5 year run at 70c though... I bought these at the local electronic surplus/junk store when I was just starting to DIY tube stuff.
When it blew, it took out an 8R 5W resistor, a diode, and a 5A fuse 🙂 Apparently, the force of the blast sent it into the chassis and dumped the power supply to ground.
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Thx. I see Ale was using a 46 to drive it. What did you use? Or maybe at this point I should ask if you posted a thread about it so I don't take this too far afield.