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Most Greedy Boy, of them all... or (there is no) DEFiSIT of Papa's Koans
Most Greedy Boy, of them all... or (there is no) DEFiSIT of Papa's Koans
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Old 10th August 2018, 05:39 PM   #721
plasnu is offline plasnu  United States
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Nickel-Iron-Steel switch

Shadow Hills Industries Mastering Compressor - Vintage King Pro Audio Outfitter
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Old 10th August 2018, 05:46 PM   #722
Zen Mod is offline Zen Mod  Serbia
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Most Greedy Boy, of them all... or (there is no) DEFiSIT of Papa's Koans
aha

shiny old knobs

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Old 11th August 2018, 07:28 AM   #723
generg is offline generg  Germany
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Most Greedy Boy, of them all... or (there is no) DEFiSIT of Papa's Koans
Default Chul parts I

some report.....



here you see Chul SITs in black

(picture most left)

the most right black curves are the THF-51 and the orange are normal P channel.

You see the crossing point is in the best case 1A and in the worst 0.6A. We would need a compensation circuit.

BUT….

I asked about four vendors of P channels for some parts with a low Vgs threshold and one delivered better ones….

In red the P channel parts with lower Vgs threshold and look, happily we have 1.5A at the crossing point with the THF and in the worst case still 1.1A.
Again red the "special" P channel, green a Harris 9140 and orange the normal IRFP240.

(second left picture)

What a progress Chul parts are for me you can imagine here.
All the black one more left are the SITs I have, much more gab between the two parts

(right picture)

Big thanks to you Chul!
Some hearing impressions will follow today.
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File Type: jpg Chul and P channel.JPG (245.8 KB, 170 views)
File Type: jpg Mine and Chul and P channel.JPG (290.9 KB, 168 views)
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Old 11th August 2018, 07:59 AM   #724
Zen Mod is offline Zen Mod  Serbia
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Most Greedy Boy, of them all... or (there is no) DEFiSIT of Papa's Koans
and that is not going to change with temp?
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Old 11th August 2018, 08:03 AM   #725
generg is offline generg  Germany
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Most Greedy Boy, of them all... or (there is no) DEFiSIT of Papa's Koans
I put the fitting pairs in and the current jumped immediately in the predicted region of 1.5A.

Nevertheless I make faults and write sometimes nonsense, so I will observe the temp
behavior to give you a more reliable answer.

:--))
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Old 11th August 2018, 08:11 AM   #726
Zen Mod is offline Zen Mod  Serbia
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Most Greedy Boy, of them all... or (there is no) DEFiSIT of Papa's Koans
just saying that I wold be sure only if both parts are measured in working temperature conditions

observe difference in Ugs between cold and hot on at least few specimens , then you'll be able to predict what is going to happen with greater certainty
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Old 11th August 2018, 08:59 AM   #727
generg is offline generg  Germany
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Most Greedy Boy, of them all... or (there is no) DEFiSIT of Papa's Koans
A bit hearing experience...

with the 1.5A and no source resistors the sound was straight forward, maybe to much pos phase k2.

Adding two 0R47 in parallel as source resistor for the P channel changed sound completely, I still could go the 1.48A.

But now more of the darkness and softness and more room I mostly prefer.

Only point the drain voltage rose to 19.5V maybe a bit too high.

So i decided inspired by the 1.2A of your original DEFiSIT to go down to 1.2A. So still more room and softness. Drain voltage around 17V now.

Means you really have to dial the bias current, source resistor and observe the drain voltage to get the "right" sound.

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Old 11th August 2018, 09:07 AM   #728
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Most Greedy Boy, of them all... or (there is no) DEFiSIT of Papa's Koans
now you (we) are going to even more appreciate each of 250pcs of SIT-3 , knowing that every one is unique

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Old 11th August 2018, 09:09 AM   #729
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Most Greedy Boy, of them all... or (there is no) DEFiSIT of Papa's Koans
G.

Dennis asked for experience with 2SK180

can you , in any comparative context , say anything of them , vs. THF51-S
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Old 11th August 2018, 09:11 AM   #730
generg is offline generg  Germany
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Most Greedy Boy, of them all... or (there is no) DEFiSIT of Papa's Koans
unfortunately I have no SK180 only SK182ES I will put in tomorrow.
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