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Alpair MAOP 10.2
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Old 28th November 2021, 08:42 PM   #161
planet10 is offline planet10  Canada
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Alpair MAOP 10.2
Too bad. Why not post them here?

FaceBook is someplace i avoid.

At least sendme the pictures?

dave
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Old 28th November 2021, 08:49 PM   #162
LeifB60 is offline LeifB60  Sweden
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Dave

I can try to send them to you. I didnt knew
you dont like FB.

Regards Leif

Last edited by LeifB60; 28th November 2021 at 09:00 PM.
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Old 28th November 2021, 10:09 PM   #163
planet10 is offline planet10  Canada
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Got em. Might as well wait for a pic with the drivers installed :^)

dave
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Old 1st December 2021, 06:46 PM   #164
bepone is offline bepone  Croatia
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upgraded amplification to OTL with 34 tubes ,

1MHz of bandwidth, single ended ( single ended, with 15 parallel output tubes), class A..

I started construction in 2011 and I finished 2015 (very long story)
using it only in special occasions like this one.

now this driver absolutely shines, pure magic
Attached Images
File Type: jpg otl3.jpg (298.9 KB, 119 views)
File Type: jpg otl2.jpg (66.4 KB, 133 views)
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Old 2nd December 2021, 12:01 AM   #165
planet10 is offline planet10  Canada
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You should be good for a winter heater :^)

dave
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Old 2nd December 2021, 12:33 AM   #166
vinylkid58 is offline vinylkid58  Canada
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Yeah, that's a LOT of tubes.

jeff
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Old 2nd December 2021, 01:06 AM   #167
chrisb is offline chrisb  Canada
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Probably sufficient to qualify one for the BC Hydro rebate on upgrading to heat pump.
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Old 2nd December 2021, 12:47 PM   #168
bepone is offline bepone  Croatia
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hehe it is a nice heater! in front there is a wall of heat! + electric consumption is like a boiler!

but waf factor is stretched to the limit and i would need to return it to the conservation, build smaller amp . but for the experience, this is it, squezed tube currents directly to the speaker, wining formula.

i will see if VFET will sound similar.....
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Old 2nd December 2021, 06:06 PM   #169
LeifB60 is offline LeifB60  Sweden
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Otl.. Nice. Never heard it.
PP 6550 is nice.. Otl maybe better.
Have seen otl in Sweden.
Not in a shop but homemade.
Fun too see others who make them.
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Old 2nd December 2021, 07:07 PM   #170
planet10 is offline planet10  Canada
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OTLs have big potential, but one is trading brute force vrs a set of OPTs. And they have strange (as in different from usual) and typically increase power as impedance increases like a current amp, but maker stalk about a reasonably high damping (ie low Rout) which is not a charateristic of a current amp.

So speaker matching might get a bit tricky, and done in the field. I expect., like a current amp, a flattish impedance is desirable (largely the case with a good FR).

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