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-   -   Doug Self Preamp from Linear Audio #5 (https://www.diyaudio.com/forums/analog-line-level/280458-doug-self-preamp-linear-audio-5-a.html)

jan.didden 7th June 2016 06:25 PM

Forr, what is the equipment you used for these measurements?

Jan

forr 7th June 2016 10:08 PM

Quote:

Originally Posted by jan.didden (https://www.diyaudio.com/forums/analog-line-level/280458-doug-self-preamp-linear-audio-5-a-post4739284.html#post4739284)
Forr, what is the equipment you used for these measurements? Jan

It's Clio Pocket. I think I will put a few words about it in the dedicated thread.
I have worked a lot with WtPro of Smith & Larson and then with Arta, Clio diagrams are nicer.

forr 8th June 2016 07:40 AM

2 Attachment(s)
Quote:

Originally Posted by forr (https://www.diyaudio.com/forums/analog-line-level/280458-doug-self-preamp-linear-audio-5-a-post4739195.html#post4739195)
Tone control : when the pots are set to get a flat response, there was no significant level difference(about 0.01 dB or less) when on or off.

Here are the diagrams. Level full scale at +/- 1 dB

07. level with tone control flat, off and on, right channel
จจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจ จจจจจจจจจ
tone control, off -> red
tone control, on -> green

08. level with tone control flat, off and on, left channel
จจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจจ จจจจจจจจ
tone control, off -> red
tone control, on -> green



mtoc 9th June 2016 02:56 AM

the THD+n of this is?

forr 9th June 2016 07:33 AM

Quote:

Originally Posted by mtoc (https://www.diyaudio.com/forums/analog-line-level/280458-doug-self-preamp-linear-audio-5-a-post4740653.html#post4740653)
the THD+n of this is?

The maximum THD quoted by Douglas Self for this preamp using anAudio Precision analyzer is less than 0.0005% for 9 Vrms ouput in the audio band.

The -3 dB frequency response that I checked with a sine wave generator and a scope extends from 1.6 Hz to 160 kHz.

georgebrooke 17th July 2016 10:50 AM

Front panel
 
1 Attachment(s)
Well, if anyone is still following this thread, I finally finished my front panel. Not perfect, but not too bad.
It was all done with a single transfer from CraftyComputerPaper at Frequently Asked Questions
Alignments are not perfect but we shall see. It is easy to remove and repeat. One small issue is that the transfer material can stretch slightly and this can make alignment a little tricky...that's my excuse anyway:)

David Whistance 17th July 2016 07:55 PM

HI Carl, I'm very, very late to this thread I know, however are there any "kits" still available? If so I'd love one. Many thanks. David Whistance

Rick G 18th July 2016 01:01 AM

George,
I am still working on my case as well. i am going to try this product on my Wood case.
Waterslide Decal Paper, Image, Transfer Paper, Iron On, Decals
failing that i will try what you used. :)

Rick

georgebrooke 18th July 2016 07:16 AM

Transfer paper
 
Quote:

Originally Posted by Rick G (https://www.diyaudio.com/forums/analog-line-level/280458-doug-self-preamp-linear-audio-5-a-post4776950.html#post4776950)
George,
I am still working on my case as well. i am going to try this product on my Wood case.
Waterslide Decal Paper, Image, Transfer Paper, Iron On, Decals
failing that i will try what you used. :)

Rick

Hi Rick,

Let me know how that goes.
The only problem with the method I used is that the edge of the transparent film is just visible to the left and right of the panel. That was why I used one large decal..fewer edges to worry about. The best solution would be something that transferred just the text and used no film. Still, with a couple of sprays of clear varnish the edges are nearly invisible

rock12 22nd July 2016 11:29 AM

looks good mine has been running for months without a case maybe this winter


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