Live Lab Hangout #1.1 Posted

[generg]

Plenty of skills!

Merveilleux Monsieur!

10 point pour Mike et la chansonnière!

 

[Michael Rothacher]

Francoise Hardy

 

[Zen Mod]

pure bliss

 

[dady]

That's incredible, dear gentlemen, every day I learn something in this forum with you my friends.
I discovering this incredible music from Françoise Hardy. I can't avoid felt in love with her. Thanks Gentlemen.

 

[Soundhappy]

....but here's a little something:

L'Amp 2SK180 Video

Thanks Michael you received first price of Stanley Kubrick
in your video ordinary light bulbs surpassed Eimac tubes.
L'Amp sound wonderful i have waiting so long time to
hear sit sound and see filament light in action
Song message , music all in harmony. Rare pearl
Greetings

 

[Soundhappy]

Test Step 1

border="1"
|-
| class="tcat"| #
| class="tcat"| SIT 182 ES
batch nr
| class="tcat"| 20 V
| class="tcat"| max 2A
|-
||1||1Z2670 || 3,00 || 0,367
|-
||2||1Z2671 || 2,77 || 0,338
|-
||3||1Z2672|| 2,69|| 0,329
|-
||4||1Z2673 || 2,87 || 0,351
|-
||5||1Z2674 || 3,94 || 0,483

 

[Soundhappy]

Test Step 2 (first 20 V with new power resistor value 8,2 Ohm+ 1ohm + 1 ohm=10,2 Ohm)

border="1"
|-
| class="tcat"| #
| class="tcat"| SIT 182 ES
batch nr
| class="tcat"| 20 V
| class="tcat"| max 2A
|-
||1||1Z2670 || 3,09 || 0,303
|-
||2||1Z2671 || 2,81 || 0,275
|-
||3||1Z2672|| 2,73|| 0,267
|-
||4||1Z2673 || 2,91 || 0,285
|-
||5||1Z2674 || 4,02 || 0,395

 

[Soundhappy]

Test Step 2 (next phase with adjustement to find voltage from test step 1)
Some times tension are not precise around 0,01 Volts. All is correct ?
Anyway with curve tracer and other 2SK182ES received
datasheet things cristalise step by step.
Have a nice day

border="1"
|-
| class="tcat"| #
| class="tcat"| SIT 182 ES
batch nr
| class="tcat"| Voltage
Step 1
| class="tcat"| New PSU
Voltage
| class="tcat"| max 2A
|-
||1||1Z2670 || 3,01|| 18,20 || 0,293
|-
||2||1Z2671 || 2,77 || 18,80 || 0,271
|-
||3||1Z2672|| 2,69|| 18,58 || 0,264
|-
||4||1Z2673 || 2,87 || 18,80 || 0,280
|-
||5||1Z2674 || 3,94 || 18,80 || 0,387

 

[Michael Rothacher]

For anyone joining late, here's what we have so far:

https://www.youtube.com/watch?v=mWTyHNhG2N4
VLOG #1
SIT Modelling

https://www.youtube.com/watch?v=dTqaR5qsT_0
Lab Hangout #1.1
Testing, SIT under a microscope, How Triodes and SITs work

https://www.youtube.com/watch?v=fbezSiQzkm4
Lab Hangout #2.1
Distortion and IV curves, 2SK180 amp test

https://www.youtube.com/watch?v=_IK6bA04x94
Lab Hangout #3
Feedback demo and discussion, tempco demo, inductor amp, SIT testing

https://www.youtube.com/watch?v=ziXvXD8NO_A
L'Amp 2SK180 in the listening room

 

[Michael Rothacher]

@soundhappy

Thanks. I'll review and report back. Don't forget to get a set at 30V (original test).

 

[Soundhappy]

@soundhappy

Thanks. I'll review and report back. Don't forget to get a set at 30V (original test).

Yes i report set 30 V / small 1K reading too
but with 10,2 or 8,2 ohm reading ??

Have made other with increased psu voltage
to find the same current with 10,2 ohm power
and was compare with 8,2ohm test results.
Just for fun good time

border="1"
|-
| class="tcat"| #
| class="tcat"| SIT 182 ES
batch nr
| class="tcat"| Voltage
10,2ohm
| class="tcat"| New PSU
Voltage
| class="tcat"| Current 8,2Ohm
|-
||1||1Z2670 || 3,38 || 27,40 || 0,368
|-
||2||1Z2671 || 3,11 || 28,52 || 0,338
|-
||3||1Z2672|| 3,04 || 27,32 || 0,330
|-
||4||1Z2673 || 3,24 || 28,19 || 0,351
|-
||5||1Z2674 || 4,42 || 24,51 || 0,483

 

[Michael Rothacher]

30V PSU, with 8R, just like the first two sets of measurements.

 

[Soundhappy]

PSU 30 V test
with 8,2R ( left yellow )
with 1kR ( right green)

border="1"
|-
| class="tcat"| #
| class="tcat"| SIT 182 ES
batch nr
| class="tcat"| Voltage on
8,2ohm
| class="tcat"| Voltage on 1K
| class="tcat"| Current 2A max
|-
||1||1Z2670 || 3,48 || 0,02 || 0,425
|-
||2||1Z2671 || 3,14 || 0,02 || 0,382
|-
||3||1Z2672|| 3,09 || 0,03 || 0,376
|-
||4||1Z2673 || 3,20 || 0,03 || 0,391
|-
||5||1Z2674 || 4,72 || 0,07 || 0,577

Greetings

 

[Michael Rothacher]

I have good news.

PSz sent me some of his 2SK182ES for testing and they look great!

So, my parts were bad, as I suspected. It happens. I will drown my sorrows in a beverage of some sort.

Here's what a good 2SK182ES looks like:

 

[Michael Rothacher]

And... congratulations soundhappy, it appears you have good parts, so we can get busy designing a little amp for you Be sure to thank Paul for trusting me with his transistors.

 

[Michael Rothacher]

For reference, here's what bad parts look like:

 

[Zen Mod]

ook

and having pair of them .........

 

[Michael Rothacher]

Double bummer

 

[panos29]

Double bummer

Can you please inform us upon the source that these fets came from in order to avoid buying from them?

 

[Michael Rothacher]

I would not want to imply that the seller is knowingly selling bad parts. This is sometimes what happens when one deals in old stock.

Instead I will tell you the name of a seller who has been friendly to deal with thus far and seems to have good parts to sell: eyelabo_jp

Your mileage may vary.

And, if you guys scoop all these up, be sure to save a pair for me.

I'll have additional info on the next hangout...whenever that happens.