• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

audio note ankoru 845 pse

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#2
never heard one , nor had it opened

however , from pics on net , muuuuuch more reliable and much better made than sorta popular , while being utter drek and garbage - similar ones from Unison Research

these are even in fire in the house category
 
#4
Ankoru.gif


looks ok to me, wanna buy a pair ? or build ?
 
#5
Thanks hpeter, Yes there’s a set for sale but looking at its age, I kind off worry about it’s reliability & also if it sounds good. Unable to find any reviews of it. Asking price is US 6,500 if it was cheaper I may take the risk but ??? Cost will be added further with new tubes hence.

Thanks again
 
#8
sumotan said:
Thank you kindly again hpeter. Yes quite costly to gamble on. I could build one but the very high voltage involve scares me. lol
Will find time to audition the amps. Cheers
Click to expand...

Yep. High voltages … and the need for lots of decent quality spaghetti (or whatever they call insulation these days). And the need for a custom output transformer, at the very least. And the need for a good driver (but I'd bet on there being perfectly capable Magnificent Television tubes to do it.)

The most important thing, rarely implemented, is to have a HV engaging switch, an DPDT that simultaneously disengages the HV transformer primary AND switches out the HV B+ … and switches in a 25 watt power resistor to more-quickly discharge the caps.

1500 V, with "50% over rating" (its safe) of 25 watt resistors at instant of switch-in would be

P = V²/R
25 × 1.5 = 1500² / R
R = 2,250,000 ÷ 37.5
R = 60 kΩ​

This will drop from 1,500 V to 50 V in almost exactly 10 seconds. Safe enough, and NOT consuming power whilst actually amplifying.

Just thinking out loud.
GoatGuy
 
#10
sumotan said:
That’s an interesting idea Goat Guy. Sometimes I myself wonder if I'm really into listening to music or just into diy for the sake of having nothing to do around the house. LOL. Cheers
Click to expand...

I think its most accurately summed up as Pride of Craftsmanship, my friend. The Craftsmanship of learning about circuit theory to the degree where one can both analyze other's findings, ideas, assertions and theories … the craftsmanship of being able to advance those ideas and theories, or disprove them. And then converting the pile of napkins to a real schematic, of finding parts that will do the job, of adjusting things from the realities of not finding parts per the original spec. Then summoning the energies and monies to buy stuff, pile it up in preparation for The Build. And setting aside enough time and bench-space to actually do the Dirty Work.

There's something magical … along the way … of turning on the power switch at various points in the build, to prove things are going per plan. Proving that the heaters are hooked up right. Proving that the various HV supplies are more-or-less doing what they're designed to do. If your design uses B+ regulation, then measuring it, showing it to be working. Before committing to The Final Build.

I get kind of stressed — from a Craftsmanship perspective — on The Final Build stage. Mostly because I'm an absolute beast for aesthetic layout and wire lashing. Oh, I'll probably never learn the lesson that such trussed piglets are a bear to change, later. But in turn, I just don't change 'em.

Finally, it all is together. The star-grounding is grounding, the hum if any has been conquered, and the needle ever so gently dropped on William Tell Overture. Hoping for the best. The speakers speak! The sound is sweet!

Definitely pride of Craftsmanship at that moment. And when the guests come over, and The Wife herself is slightly proud that your expensive hobby has something to show for itself. And — if you're like most of us and keep somewhat technically competent friends close — the guests might well appreciate it too. Like the gear-heads who geek out admiring a fine, fine motorcycle, or a great old sports car renovation.

Just saying.
GoatGuy
 
#11
You absolutely correct GoatGuy. I’ve finally finished tweaking my whole set up.
Now looking & thinking of ideas of how to packaged it up nicely. This as you know takes awhile. This is also the reason why I took interest in the Ankoru.
Takes just too much time to build, test etc. If the price is much lower I will go for it, I mean given the parts needed to build a clone will still be around $3-4k.
Oh well it’s the itchy fingers at work again. We diyers are a difficult bunch. lol

Thanks & take care
 
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