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Old 27th March 2014, 02:43 PM   #11
Michael Rothacher is offline Michael Rothacher  United States
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I think I can share a little bit without stepping on any toes.

LumnAria was a little demo project I did for my 2012 trip to Burning Amp. It uses the 2SK82 KD-33, specifically, which I’m told is no longer available. I tried as much as possible to start with a set of design goals and design constraints, and then show my rationale for various design decisions, including the math, as there always seems to be some interest in how things can be calculated.

It is probably more of a proof-of-concept/learning piece than a straight-up project piece, so I leave it to you to decide if you’d like to buy a copy. Naturally, I encourage you to support audioXpress and I'm grateful for your interest.

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Old 27th March 2014, 03:58 PM   #12
Soundhappy is offline Soundhappy  France
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Nice to have some informative advert.
Thanks Mike


link for buy on line is :

audioXpress Issue April 2014


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Old 28th March 2014, 07:49 PM   #13
generg is offline generg  Germany
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Very good article Mike!

Highly recommended!

is this true

Parts List
(Resistors are 25 W unless marked otherwise)

or do you mean 0.25W

:-)
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Old 28th March 2014, 08:47 PM   #14
Michael Rothacher is offline Michael Rothacher  United States
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Yes, thank you. It should be .25W (1/4W) not 25W. Oops

I'm glad you enjoyed it.
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Old 28th March 2014, 08:48 PM   #15
Zen Mod is online now Zen Mod  Serbia
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great article , Mr. MR

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Old 28th March 2014, 08:50 PM   #16
Michael Rothacher is offline Michael Rothacher  United States
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You're a gentleman, thank you.

They edited-out all of my silly Americanisms, though
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Old 28th March 2014, 08:55 PM   #17
Zen Mod is online now Zen Mod  Serbia
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exactly that's why we have Papaland , here

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Old 28th March 2014, 09:16 PM   #18
generg is offline generg  Germany
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Quote:
Originally Posted by Michael Rothacher View Post
Yes, thank you. It should be .25W (1/4W) not 25W. Oops

I'm glad you enjoyed it.
I just wanted to order all 25W resistors when I looked at the picture and hesitated…. :-)

Your article is so patient with us and you really care for the stuff and us…

THX
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Old 8th May 2014, 09:04 AM   #19
generg is offline generg  Germany
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O.k. Mike I will build it point to point.

Unfortunately I have only KE at the moment.
I did some measurements with the SITs some time ago with lockys curve tracer. The data are not very reliable, because the negative gate voltage is subtracted from the available drain voltage (24V). So there is not much headroom and weird effects in the graphs when the PSU collapses.

Nevertheless I have the impression that the KE in red (KD in black) reach the wanted drain current at lower negative gate voltages than the KD.

So I will simply try to get the 90V and 50mA with the KE and then look at the distortion when I change the R112 (600R) pot.
The green one is a KF

o.k.?
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Old 9th May 2014, 12:08 AM   #20
Michael Rothacher is offline Michael Rothacher  United States
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Yes, you've got the right idea. You'll need a few more volts to get there.

P.S. I don't hang around the forum much these days but you can email me anytime.
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