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Live Lab Hangout #1.1 Posted
Live Lab Hangout #1.1 Posted
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Old 16th February 2015, 12:01 AM   #21
Michael Rothacher is offline Michael Rothacher  United States
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Live Lab Hangout #1.1 Posted
Meanwhile, here's a couple of glamour shots:
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File Type: jpg 2sk182iv.jpg (338.5 KB, 645 views)
File Type: jpg 2sk180lamp1.jpg (412.7 KB, 643 views)
File Type: jpg 2sk180lamp2.jpg (358.7 KB, 614 views)
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Old 16th February 2015, 12:09 AM   #22
Michael Rothacher is offline Michael Rothacher  United States
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Live Lab Hangout #1.1 Posted
And here's a set of curves for the 2SK182ES. Super fugly for realz.
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File Type: jpg 2sk182esCsm.jpg (105.8 KB, 607 views)
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Old 16th February 2015, 01:30 AM   #23
Soundhappy is offline Soundhappy  France
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Nice interesting photos Michael
Many high fidelity aficionados dream about single triode characteristic stage with more power.
Simple 2SK82 l'Amp SIT give at output ~ 4 watts.
Could you describe little bit about potential of 2SK180 & 2SK182 ES ?
Linearity, gain, distortion, power from first hand experience not datasheet ?
Have a nice day. Best regards
Christophe
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Last edited by Soundhappy; 16th February 2015 at 01:37 AM.
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Old 16th February 2015, 03:05 AM   #24
Soundhappy is offline Soundhappy  France
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Yes they are huge and solid
promising look sit
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Old 16th February 2015, 08:10 AM   #25
dady is offline dady  Argentina
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Send a message via MSN to dady Live Lab Hangout #1.1 Posted
Dear Michael, how is the resistance of the lamp?
Here on Spain we are looking for this kind of lamps but only should get 125v /500W with E40 socket. Maybe We should use a couple in parallel.
One question, now I am getting more tools, I have only a scope and a generator, but the circuit for trace the curves, which circuit you made?
Best Regards


Best Regards for the rest of interested people waiting for the results from this amazing hobby.
Best Regards for Sound Happy my frenchi friend du Montpellier.
Best Regards for the Tiger Jama, my closest inspirer and friend.
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Old 16th February 2015, 11:35 AM   #26
Michael Rothacher is offline Michael Rothacher  United States
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Live Lab Hangout #1.1 Posted
The 2SK180 seemed perfectly workable. I was seeing around .280% THD at a watt for the amp in the video, with THD around 1% at 4 watts. The big guy (NP) is working on something using this part, so I'll defer to him. I'm not gonna preempt the master.

The 2SK182ES I tested is pretty nasty. If you look at the curves, ideally we'd like those traces to be parallel and evenly spaced in the region where we intend to operate the device. When they're not, our output waveform gets squished and stretched, and this squishing and stretching causes harmonic distortion.

I beat on it pretty hard, running the current and voltage way up to see if I could get anything good out of it, but alas there are some problems even load line cancellation can't overcome. This might be a good part for a multi-kilowatt class A amp.

@dady
I used a Tektronix curve tracer to make those curves. I detailed a method to make curves with an improvised curve tracer in the original L'Amp article, but it's tedious and you must be careful.

2 300 Watt bulbs in parallel is about 11-13 Ohms.

I'll re-record the material with better sound and video and re-post something soon.

Last edited by Michael Rothacher; 16th February 2015 at 11:43 AM.
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Old 16th February 2015, 07:25 PM   #27
Soundhappy is offline Soundhappy  France
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Quote:
Originally Posted by Michael Rothacher View Post
The 2SK182ES I tested is pretty nasty.
Thanks for answer Michael.
Hope they become workable too !
Good luck in research of sweet spot and topology.
Personally don't need 2K watt but if posible this be " party time " amplifier for
out summer nights or just dozen watts in single-ended minimal way for long winter evenings.

Now i wait 2SK182 ES delivery from Tokyo i report after reception hear is link for interested diyers :

1pcs NEW Tokin Transistor 2SK182ES Made IN Japan Shipping Charge Free | eBay

7/50 on box is Tokin SIT grade or something other parameter ??
@ Dady Thanks Amigo have fun
Best regards to all diyers
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Old 17th February 2015, 03:41 AM   #28
Nelson Pass is offline Nelson Pass  United States
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Live Lab Hangout #1.1 Posted
Quote:
Originally Posted by Michael Rothacher View Post
The 2SK180 seemed perfectly workable. I was seeing around .280% THD at a watt for the amp in the video, with THD around 1% at 4 watts. The big guy (NP) is working on something using this part, so I'll defer to him. I'm not gonna preempt the master.
Don't hold back for me. We are here for the benefit of DIY audio.

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Old 17th February 2015, 10:18 AM   #29
Michael Rothacher is offline Michael Rothacher  United States
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Live Lab Hangout #1.1 Posted
Thanks, Nelson. I'll keep working on the low-hanging fruit, just so long as I don't deprive us of something more interesting.
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Old 18th February 2015, 08:33 PM   #30
Soundhappy is offline Soundhappy  France
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My amigo have showed me this topology with 2SK182 ES

With painted a circuit, STI(2SK182E) pipe of the SRPP circuit, is feasible?

Thanks Dady

We have mimimalistic topology for sit amp with 2SK180 too

SIT Power Amplifier

L'Amp with biger sitīs are interesting upgrade.
Just collected semis for next amp build
See you Michael at your Lab
Kindly regards
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File Type: jpg BA60F97F-E828-4C36-A283-1103B9DC55DC.JPG (109.1 KB, 175 views)
File Type: jpg 0139ED67-9327-4D74-9E43-A2C6AE024647.JPG (33.4 KB, 195 views)
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