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Old 3rd February 2013, 12:20 AM   #661
6L6 is offline 6L6  United States
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Another thing to think about is that the feel of the rotary switch will be effected greatly by the diameter of the knob... the force required will be much reduced, and the feel much lighter if you use a really big knob.
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Old 3rd February 2013, 09:57 AM   #662
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Maybe buying one of these and putting B1 circuit inside would be good idea for fast project

Passive Preamp Preamplifier 48 Stepped Attenuator Highend for Audiophiles | eBay

Though I have no idea about it's quality, just seen it on eBay looking how the cheap chinese stepped attenuators look
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Old 3rd February 2013, 10:03 AM   #663
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Earlier I had a problem using LDR with B1,now switched to TE 47k dual pot 27ESB473MMF50NF - TE CONNECTIVITY / CITEC - POTENTIOMETER, D/GANG LOG 47K | element14 India
It sounds great.

Regards,
Sachin
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Old 3rd February 2013, 03:53 PM   #664
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Hello

How about this B1 with a gain stage ?

Does the sound of it would be same than the original B1 ?

Thank

Gaetan
Attached Images
File Type: gif B1 with gain.gif (16.9 KB, 309 views)
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Old 3rd February 2013, 05:14 PM   #665
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I don't expect that it will sound the same, but that doesn't mean you shouldn't
build it and see.

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Old 4th February 2013, 09:27 PM   #666
rokoko is offline rokoko  United States
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Thanks for all your cooments.
Zygibajt, the link for the passive preamp you provide is for the product build in Warszawa, Poland: akustyk.com.
The switches are made as custom and the guys making them told that switches configured only for shunt toplogy. They do not make them as series or ladder. They also sell switches you see in that box. Switches named: Khozmo. Khozmo Volume Attenuator
Again only shunt reg.
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Old 4th February 2013, 09:39 PM   #667
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Quote:
Originally Posted by Nelson Pass View Post
I don't expect that it will sound the same, but that doesn't mean you shouldn't
build it and see.

Hello

If it sound as good as the original B1, I will be happy.

Thank

Bye

Gaetan
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Old 4th February 2013, 10:43 PM   #668
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Quote:
Originally Posted by rokoko View Post
Thanks for all your cooments.
Zygibajt, the link for the passive preamp you provide is for the product build in Warszawa, Poland: akustyk.com.
The switches are made as custom and the guys making them told that switches configured only for shunt toplogy. They do not make them as series or ladder. They also sell switches you see in that box. Switches named: Khozmo. Khozmo Volume Attenuator
Again only shunt reg.
Big sorry, I truly haven't even noticed they are from my country. I have never heard of them and this is first time I see this product and the switches they make. To be hones I'm very rarely interested what is happening in audio inside my country but rather worldwide. Not much happening over here. Thanks for pointing this.
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Old 5th February 2013, 03:37 AM   #669
rokoko is offline rokoko  United States
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Well, you might be surprosed that some other good staff in electronics world is being made in Poland.
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Old 7th February 2013, 08:09 PM   #670
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Hello

I have simulated, with Ltspice, at 1khz with 1 volt input, the B1 with gain circuit in the post #664

The thd fft spectrum show much more distortions than the original B1 circuit simulation.

Is it normal, what modifications could be done to lower the distortions of the B1 with gain circuit ?

I include an image of the thd fft spectrum and the .asc file of the B1 with gain circuit.

Thank you

Bye

Gaetan
Attached Images
File Type: gif B1with_gains-thd.gif (21.0 KB, 181 views)
Attached Files
File Type: asc B1with_gains.asc (3.5 KB, 5 views)

Last edited by gaetan8888; 7th February 2013 at 08:12 PM.
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