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B1 with Korg Triode
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Old 22nd January 2020, 12:41 PM   #4051
Soundhappy is offline Soundhappy  France
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Originally Posted by RegaPedro View Post
Next I'm going to try putting the Korg PCB into a small enclosure to see if the noise goes away.
Congratulation RegaPedro B1K is sound the best if closed in enclosure box.
Maybe hum noise is about SMPS quality ? Greetings
class A amplifiers with full range speakers
sings like angels in heaven
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Old 22nd January 2020, 05:45 PM   #4052
ian_UK is offline ian_UK  United Kingdom
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I am a beginner, so sorry if this is a silly question.

I have an AS power amp with 33db gain, so I don't need the B1K gain.
Would it be possible to use the B1K as a DAC output stage, using a chip like the AD1865, adjusting the I/V resistance so that the B1K output was 1-2 volts max?
Clearly the pot (or TVC) would have to be somewhere else.
Or should I look elsewhere for a triode output stage?
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Old 22nd January 2020, 06:03 PM   #4053
Marra is offline Marra  United Kingdom
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B1 with Korg Triode
I use a pair of Rothwell Audio inline attenuators on my power amp input with my B1K so that I have reasonable movement on the volume control. If that's at all helpful.
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Old 22nd January 2020, 09:55 PM   #4054
Nelson Pass is offline Nelson Pass  United States
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B1 with Korg Triode
Originally Posted by ian_UK View Post
I have an AS power amp with 33db gain, so I don't need the B1K gain.
You can attenuate both the input and output with pots.

You can also alter the load value of the Plate resistor. lowering it for
less gain.

All these will alter the harmonic content, so you might find yourself
readjusting the bias for the desired curve.
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Old Yesterday, 11:19 AM   #4055
DosenZorn is offline DosenZorn
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Originally Posted by avdesignguru View Post
The Pearl II set to 55dB gain with a 4mV MM cartridge will definitely provide a lot of output. So you probably could run it directly into an attenuator and typically drive most power amplifiers to full output. Maybe not as well using a lower output cart.

2. It partly depends on whether you care about absolute signal polarity or not.

Thank you very much. That was the answer I was searching for.
As far as I know it's possible to reduce the Pearl gain to 40dB. This may help out.

Wish everyone a nice day.
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