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Salas DCG3 preamp (line & headphone)
Salas DCG3 preamp (line & headphone)
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Old Yesterday, 07:48 PM   #2601
615498 is online now 615498  Canada
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Join Date: Dec 2004
Location: Duncan, Vancouver Island, BC
Salas DCG3 preamp (line & headphone)
Default Happy camping

Hi Salas,

It's about time I posted a pic of the finished work. I recently reset the DC offset; the music (AWB today) is centered and rock solid. I love this thing!

Thanks again Salas.

Keith
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Old Yesterday, 07:49 PM   #2602
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
Quote:
Originally Posted by beardman View Post
i have heard that discrete opamp not are the best in servo,,,is it something with the use of jfet in normally opamp ?
He tried the OPA1642 also I think. Bipolar is not best here due to high source resistor but some still work well.
All industrial JFET input dual chips of 12nVrtHz or less noise spec that can handle +/-18V rails at least and have low THD at 10K load are technically competent to roll here. Given the resulting offset is low. I have measured and listened with some that met or bested the above criteria during the development, the OPA2604 too. They all passed with no additional noise or extra THD on the preamp's FFT. Except the traditional old TL072 that showed some measurable worsening contribution. Its below than modern average spec naturally allowed that. But the DC offset was fine.
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Old Yesterday, 07:52 PM   #2603
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
Quote:
Originally Posted by 615498 View Post
Hi Salas,

It's about time I posted a pic of the finished work. I recently reset the DC offset; the music (AWB today) is centered and rock solid. I love this thing!

Thanks again Salas.

Keith
Congratulations! Nice low profile box build, Hammond allowing. Tell us a few words about the system it plays in. I see (EL34?) glass bottles there...
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Old Yesterday, 11:30 PM   #2604
615498 is online now 615498  Canada
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Join Date: Dec 2004
Location: Duncan, Vancouver Island, BC
Salas DCG3 preamp (line & headphone)
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Originally Posted by Salas View Post
Congratulations! Nice low profile box build, Hammond allowing. Tell us a few words about the system it plays in. I see (EL34?) glass bottles there...
Actually, the Hammonds are normally under cover. And yes, you see right...EL34's driven by a 'Dynamutt' noval board. Magnaquest OPT's.
The speakers are from the diyAudio Fast, Fun OB project elsewhere on this site.

The phono pre (and its pricey tubes) is one of Jim Hagerman's original board kits. The sale of its tubes will buy a planned tubed phono stage (diy of course) and a few records. Sumiko arm on the table, Audio Technica 33PGTII, Kelly/Bergeron speed controller (can be searched under Maxon' GB'), Cinemag SUT,.

All good wife-approved fun...what could be better

Keith
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Old Today, 12:04 AM   #2605
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
Nice DIY system. I have an AT33PTGII too. Have also listened to a friend's Manzanita OB with TC9 "tweeter". Smooth plate Telefunken are fetching a pretty penny indeed.
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