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ADAGIO from Dr. Bora Jagodics
ADAGIO from Dr. Bora Jagodics
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Old 5th February 2019, 09:14 PM   #1
alex mm is offline alex mm  Romania
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Default ADAGIO from Dr. Bora Jagodics

New year, new build,in progress, tone correction preamplifier with 12AX7EH schematic ADAGIO from Dr.Bora Jagodics (R.I.P.) . Second build this year .....
Regards,
Alex
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File Type: jpg IMG_20190205_184311-001.jpg (1,000.3 KB, 101 views)
File Type: jpg ADAGIO SCHEMATIC.jpg (162.1 KB, 343 views)
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CD player Onkyo C-N 7050 , Preamp's :Adagio tube
and Goldmund Mimesis 27 , Speakers :Taga Harmony Platinum F-120 Amp's: 2XGoldmund Mimesis9.2, A33, 2XGROMES A260 tube , SARA , QUAD 405-13
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Old 6th February 2019, 01:15 PM   #2
alex mm is offline alex mm  Romania
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pictures .....
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File Type: jpg IMG_20190206_160452.jpg (992.3 KB, 248 views)
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CD player Onkyo C-N 7050 , Preamp's :Adagio tube
and Goldmund Mimesis 27 , Speakers :Taga Harmony Platinum F-120 Amp's: 2XGoldmund Mimesis9.2, A33, 2XGROMES A260 tube , SARA , QUAD 405-13
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Old 7th February 2019, 01:25 AM   #3
kissabout2002 is offline kissabout2002  Italy
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Hi "alex mm", I am been impressed by the schematic of your build so I put it on a simulator specially for the tone control, I built so far many tone control so I was curious, here the result.( 1st/2nd pic.) I think some adjustment are necessary because the target of a good tone control is have the audio taper potentiometers to get rather flat response when they are set halfway between maximum and minimum around 0 dB and you can see the Adagio is far away from it also there is really no one curve response flat in the middle of the plot and a lot of roll-off frequency.
A good tone stack control should work like this ( Pic 3 & 4 ).
I build many tone control from the RCA schematic and so on but the one really achieve all goals I found in this website Practical Tone Controls.
Ltspice simulator work very well with tone control circuit, I recently built the 3 tone control propose in the website and the result is outstanding and as you can see simulation and real test are very close. ( Pic 5,6,7 )
Now I think the Adagio because can be used as a pre-amp without tone control or with tone control cannot really achieve a good performance because the first stage is not a cathode follower so with hight output impedance is very difficult but I think that some adjustment on the value of the component can just give some improvement. All the best
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File Type: png 6.png (75.8 KB, 104 views)
File Type: jpg 7.jpg (93.9 KB, 84 views)
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Old 7th February 2019, 04:12 PM   #4
alex mm is offline alex mm  Romania
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Hi Kissabout 2002 ,
Thanks for your toughs , simulation, schematic . I will reconsider schematic, and I will try, some changes, in values of components to see how it works . This board it's a prototype and I agree for modified version. I'm not so good in theoretical things, I'm a hobbyist . Pictures from 2010 of first built tone correction.
Regards,
Alex
Attached Images
File Type: jpg IMG_3147.jpg (172.5 KB, 168 views)
File Type: jpg IMG_3057.jpg (199.7 KB, 184 views)
File Type: jpg IMG_3063.jpg (499.0 KB, 172 views)
File Type: jpg IMG_3066.jpg (141.8 KB, 166 views)
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CD player Onkyo C-N 7050 , Preamp's :Adagio tube
and Goldmund Mimesis 27 , Speakers :Taga Harmony Platinum F-120 Amp's: 2XGoldmund Mimesis9.2, A33, 2XGROMES A260 tube , SARA , QUAD 405-13
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Old 9th February 2019, 07:25 AM   #5
jazbo8 is offline jazbo8
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ADAGIO from Dr. Bora Jagodics
Posts moved from the Pictures Thread, please note that discussion of a specific build should be conducted in its own thread, and not in the Sticky thread.
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Old 9th February 2019, 01:46 PM   #6
Ketje is offline Ketje  Belgium
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I think there is an error in the schematic
Mona
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Old 9th February 2019, 01:47 PM   #7
Mosquito is offline Mosquito  Argentina
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Quote:
Originally Posted by kissabout2002 View Post
Hi "alex mm", I am been impressed by the schematic of your build so I put it on a simulator specially for the tone control, I built so far many tone control so I was curious, here the result.
Hi, missing in Your sim: 100K, from V1b plate to V1a cathode.
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Old 9th February 2019, 02:11 PM   #8
kissabout2002 is offline kissabout2002  Italy
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Thanks Mosquito corrected..., much better response
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Old 9th February 2019, 11:42 PM   #9
PRR is online now PRR  United States
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> I think there is an error in the schematic

Either way works, and could be "correct".
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Old 10th February 2019, 10:02 AM   #10
Ketje is offline Ketje  Belgium
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You are right, but it felt wrong letting the current of one tube infuence the other. After all the original circuit is even better if tubes behave.The current in the first triode is better defined with it's an independent cathode resistor.
Mona
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