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 Post subject: Another preamps build
PostPosted: Tue Apr 17, 2018 7:27 am 
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Location: Toronto, ON, CA
This is another preamp built a while ago.

As usual, measure the parts make sure they are what they claimed to be and mark their values (again, big vendors like digikey, mouser could make mistakes too, even though it's rare)

Basically from lower to higher sequence, install the resistors first;

Use a knife scratch resistor's legs before install them, this could help a clean, and solid solder joint.

Resistors are Vishay MRS25, one of my "favourite", 50ppm ...I used them a lot when building power amps...no fancy stuff


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Last edited by Frank Wang on Sun Apr 29, 2018 5:07 am, edited 2 times in total.
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 Post subject: Re: Another preamp build
PostPosted: Tue Apr 17, 2018 9:52 am 
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Location: Toronto, ON, CA
313/317 power supply.


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 Post subject: Re: Another preamp build
PostPosted: Tue Apr 17, 2018 11:28 am 
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Location: Toronto, ON, CA
Power switch ...made a small PCB to do the "Triacs" trick, well, a bit more elegant....


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 Post subject: Re: Another preamp build
PostPosted: Tue Apr 17, 2018 12:21 pm 
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Joined: Sat Sep 01, 2012 5:08 am
Posts: 698
Location: Montréal, QC, CA
Hi Frank,

it's a very nice board.

Who made it ? (2x D402)

What gain for the opa ? (5532 is a bit noisy at high gain, but very good at low gain)

Thanks for sharing.

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Keep things simple and even simpler
Nakamichi BX-300/Balance BW-1010 DAC, Balance MR-50R, Infinity RS 8 Kappa
Nakamichi Dragon/Onix Dac25b, Audio Research SP-9, Spectral DMA-100s/Nakamichi PA-7II, Martin-Logan CLSII/Balance Helicia


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 Post subject: Re: Another preamp build
PostPosted: Tue Apr 17, 2018 1:05 pm 
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Location: Toronto, ON, CA
Nakamichel wrote:
Hi Frank,

it's a very nice board.

Who made it ? (2x D402)

What gain for the opa ? (5532 is a bit noisy at high gain, but very good at low gain)

Thanks for sharing.


You are very careful! Yeah, one of the D402 is a typo, should be D401...luckily they are the same parts - 1N4148

5532 here is servo, corrected the first post to avoid confusion...


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 Post subject: Re: Another preamp build
PostPosted: Tue Apr 17, 2018 1:20 pm 
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Location: Montréal, QC, CA
8)

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Nakamichi Dragon/Onix Dac25b, Audio Research SP-9, Spectral DMA-100s/Nakamichi PA-7II, Martin-Logan CLSII/Balance Helicia


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 Post subject: Re: Another preamp build
PostPosted: Tue Apr 17, 2018 1:54 pm 
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Location: Kingston, ON, CA
Quote:
Use a knife scratch resistor's legs before install them, this could help a clean, and solid solder joint.


flat blade miniature needle nose pliers work well for this purpose. The added bonus is that you can clean two sides at the same time. Just clamp the resistor or capacitor or diode leg in the jaws, gently, and then move the leg up and down through the jaws while rotating the given wire leg. Makes short work of the job, and you probably have the given pliers in hand all the time, anyway...

I like non magnetic parts only, as they tend to sound best, with no smear to the hf that will happen with anything that has magnetically sensitive materials in it. My current cheap favorite and widely available nonmagnetic resistor is the PRP brand.

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 Post subject: Re: Another preamp build
PostPosted: Tue Apr 17, 2018 2:01 pm 
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Location: Repentigny, QC, CA
I always like to see a FRANK W build. Meticulous is the word I'd use.

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 Post subject: Re: Another preamp build
PostPosted: Tue Apr 17, 2018 2:47 pm 
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Joined: Sun Dec 28, 2008 7:49 am
Posts: 1937
Location: Fairport Beach (in Pickering), ON, CA
Teo Audio wrote:
Quote:
Use a knife scratch resistor's legs before install them, this could help a clean, and solid solder joint.


flat blade miniature needle nose pliers work well for this purpose. The added bonus is that you can clean two sides at the same time. Just clamp the resistor or capacitor or diode leg in the jaws, gently, and then move the leg up and down through the jaws while rotating the given wire leg. Makes short work of the job, and you probably have the given pliers in hand all the time, anyway...

I like non magnetic parts only, as they tend to sound best, with no smear to the hf that will happen with anything that has magnetically sensitive materials in it. My current cheap favorite and widely available nonmagnetic resistor is the PRP brand.


Scotch-brite also works well for cleaning parts. It is commonly found in the kitchen for cleaning pots.

I've seen Vishay RN series Mil-Spec resistors used in high end gear. Definitely less expensive than boutique resistors, and if they're good enough for Bruce Moore that's good enough for me! :D

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Collecting vintage tube Pilot (Pilotone) HiFi gear.


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 Post subject: Re: Another preamp build
PostPosted: Tue Apr 17, 2018 5:25 pm 
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Location: Toronto, ON, CA
Tom_r wrote:

Scotch-brite also works well for cleaning parts. It is commonly found in the kitchen for cleaning pots.

I've seen Vishay RN series Mil-Spec resistors used in high end gear. Definitely less expensive than boutique resistors, and if they're good enough for Bruce Moore that's good enough for me! :D


Yes, many ways to clean parts...sand papers and so on.

The MRS25 I used is Vishay, currently in production...not Philips which also has MRS25 and is boutique. I'm not "against" RN ones, just the color, and I prefer the blue ones;-)

Tried to use the transformer's 100V (either 120V or 100V) on primary side, turned out voltage on secondary side is too high...used 120V on primary side in the end. It's a lovely PCB mount ...


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Last edited by Frank Wang on Wed Apr 18, 2018 2:12 am, edited 1 time in total.
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 Post subject: Re: Another preamp build
PostPosted: Tue Apr 17, 2018 9:44 pm 
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Location: Coquitlam, BC, CA
Cool, I like to see that some don't just try to buy their way into being an "audiophile". Myself, I couldn't design it, but I'd really like to get into a project like that. I basically redid an entire amp and it's quite rewarding.


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 Post subject: Re: Another preamp build
PostPosted: Thu Apr 19, 2018 12:09 pm 
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Location: Toronto, ON, CA
Since this board has power supply section, check and make sure the power supply part works fine, then proceed to next.

The rest are just put correspondent parts into PCB and solder...


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 Post subject: Re: Another preamp build
PostPosted: Fri Apr 20, 2018 6:00 am 
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Location: Toronto, ON, CA
Boring meatal works...it's a hifi2000(diyaudio chassis vendor) steel chassis, with 1mm front and back panels.


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 Post subject: Re: Another preamp build
PostPosted: Sat Apr 21, 2018 8:58 am 
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Location: Montréal, QC, CA
Well, professional build and looking. Congrats.

But how it sounds ?

What are the goods ?
What are the bads ?

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Keep things simple and even simpler
Nakamichi BX-300/Balance BW-1010 DAC, Balance MR-50R, Infinity RS 8 Kappa
Nakamichi Dragon/Onix Dac25b, Audio Research SP-9, Spectral DMA-100s/Nakamichi PA-7II, Martin-Logan CLSII/Balance Helicia


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 Post subject: Re: Another preamp build
PostPosted: Sun Apr 22, 2018 6:05 pm 
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Location: Toronto, ON, CA
I normally don't judge the sound...but I did put it into a chassis which means something (I do not bother putting everything into a chassis unless...)...so all I can say is that I do like it, and worth what I paid for, and more...it has being driving my F6 for a while ;-)

It's personal and subjective...One thing is that even though the circuit design, and PCB design/layout kind of doomed the whole thing...but different people can build and end up different sound. People choose parts based on their understanding what's the "correct/best" parts, and this can influence the sound...in some cases this influence could be profound. I did switch several parts for "tuning", that's also the fun part. Subjective...needless to say...

I do enjoy messing around and keep trying various toys...soon, will be another preamp.


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