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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Vendetta Research SCP-2A
Vendetta Research SCP-2A
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Old 22nd April 2019, 04:44 PM   #11
kuly is offline kuly  Russian Federation
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OHHH. Thank you very much and thank you !!!
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Old 22nd April 2019, 05:32 PM   #12
EDDELARUE is offline EDDELARUE  Brazil
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Old 22nd April 2019, 05:57 PM   #13
EDDELARUE is offline EDDELARUE  Brazil
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Old 22nd April 2019, 06:20 PM   #14
john curl is offline john curl  United States
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I meant pin 6, not pin 7. my mistake
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Old 22nd April 2019, 07:15 PM   #15
kuly is offline kuly  Russian Federation
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Quote:
Originally Posted by john curl View Post
I meant pin 6, not pin 7. my mistake
OK!!!

The main problem is that there are no real transistors (2sk147------2sj75,,,,,.
I don’t want to bet on the Chinese! --- I’ll search for a long time at the Japanese auction - and then it’s possible that they already sit there and sell goods from China - the truth is not known

I recently for an amplifier luxman-bought in China (real !!!!) transistors-original))))
Listening is not possible nasty nasty sound!

the graphics are good))) - but the music is different

Last edited by kuly; 22nd April 2019 at 07:18 PM.
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Old 23rd April 2019, 03:15 PM   #16
kuly is offline kuly  Russian Federation
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For John
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Old 6th June 2019, 02:01 PM   #17
kuly is offline kuly  Russian Federation
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What can replace the transistor. J203 ?
which analog is available? j203

I put this - does not work mmbf j201
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Old 6th June 2019, 02:47 PM   #18
ticknpop is offline ticknpop  Canada
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Vendetta Research SCP-2A
I suspect you can use 2sk170/ 2sj74, they are being used as low noise current sources to set the output voltage of the jfet cap multipliers, but you have to select ones with the correct idss to set the output voltage when combined with the resistors 5k11 and 4k99 ( or the resistors are selected to match the jfets idss) anyway it ‘s the combination of the jfets idss and the resistor value that sets the output voltage
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Old 6th June 2019, 04:03 PM   #19
kuly is offline kuly  Russian Federation
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Hooray! Thank ! I put sk170 - Earned!
modes are different i will pick up

5k11------!!???
4k99-------!!???
how to count them?

I will not reinvent the wheel !!!

I will buy J203 (204)

Last edited by kuly; 6th June 2019 at 04:12 PM.
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Old 28th June 2019, 05:56 PM   #20
kuly is offline kuly  Russian Federation
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The scheme turned on-the sound goes!
Applied other transistors-modes have changed and are not similar to the original. How do i fix skew 30mV-- 300mV. What can be leveled?

is 40mv in the left side ok?

The sound goes good plays well! help as you can adjust the scheme -modes?
please give good advice
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