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The Phonoclone and VSPS PCB Help Desk
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Old 16th March 2019, 11:40 AM   #4121
rjm is offline rjm  Japan
Richard Murdey
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The Phonoclone and VSPS PCB Help Desk
R2 should be about 680 ohms, though the exact value is not critical.

It sort of sounds like the ground connection internal to the TT has gone open circuit somewhere, so parts that were supposed to be connected to the ground wire are left floating. That or there is some weird noise pickup into the cartridge or phono cables for example, like a nearby wifi or switching power supply. If its possible to change to a different set of phono interconnects I'd give that a shot at least.
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Old 16th March 2019, 12:46 PM   #4122
bolec666 is offline bolec666  Poland
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My TT is Linn Basik - where cable connects only to the tonearm (via 5din 90 degree socket) - there is no grounding connection to the motor - both are seperatly connected to MDF chassis. Most likely cable has gone bad - couple of years ago i already had this problem - replacing the cable helped
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Old 16th March 2019, 04:12 PM   #4123
bolec666 is offline bolec666  Poland
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it WORKS now great. Wierdest thing ever, i removed the cart and mounted it back- no hum. i suspect that cables in headshel are no good anymore.

Preamplifier works great now- but some more gain will be appreciated so I ordered a pair of dale's 681.

Sounds beautiful! Thank you Richard, wonderful preamp!

phonoclone 1.jpg
phonoclone 2.jpg
phonoclone 3.jpg

Last edited by bolec666; 16th March 2019 at 04:40 PM.
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Old 16th March 2019, 11:17 PM   #4124
rjm is offline rjm  Japan
Richard Murdey
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Hey, that's a relief! Definitely time to replace the headshell cables methinks.
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Old 17th March 2019, 06:54 AM   #4125
mortenaasted is offline mortenaasted  Denmark
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Hi RJM
I want to test the 4.4 point to point wired.
Is it 2x3 decoupling caps per IC?
Looks like, if i preview the PCB.
Normal i would have done it with to i parallel, eg 100uf+.1uf.
Br Morten
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Old 17th March 2019, 01:17 PM   #4126
rjm is offline rjm  Japan
Richard Murdey
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If you are doing your own layout, you can choose however you want. I usually bypass with 0.1 uF on the V+ and V- of each op amp, with some additional electrolytics 100-330 uF total per pin. Here it's 2x100uF, but that's really because it was convenient for the space left on the board. You can use more small capacitors, or one big one, as you like.
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Old Yesterday, 06:47 PM   #4127
bolec666 is offline bolec666  Poland
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replaced r2 with 681R - spot on with gain with my dl-103- I'm in love with performance of this preamplifier
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Old Today, 01:42 AM   #4128
maikel76 is offline maikel76  Thailand
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Quote:
Originally Posted by bolec666 View Post
replaced r2 with 681R - spot on with gain with my dl-103- I'm in love with performance of this preamplifier
Hi Bolec,
Happy itís working now. I know itís subjective, however Iím very curious if you could describe what you like so much about the performance in comparison with the other phono-amp you used.
Also would you be ok to share the rest of your setup/equipment?
Iím considering to build this amp specifically because of the inputstage.
Iím using a Benz-Micro Ace Low output MC, recordplayer is Thorens TD-2001
Currently using an old and very good Mitsubishi pre-amp DA-P10 as phonoamp with stepup coils from Ortofon.
Unison Research simply 2 tube amp with Sonus Faber Electa I speakers
Thank you
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Old Today, 07:45 AM   #4129
warrjon is offline warrjon  Australia
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I have it on my Rega RP8/Aphetta and it is brilliant.

My thoughts - it sounds clean but not bright. I was very surprised I was not sure what to expect.

I have not run my Rega with any other phono preamp. My Linn LP12 had a IITOK and Troika with a Linn preamp and the Rega/Phonoclone kills it with imaging, warmth, detail and Bass.

Last edited by warrjon; Today at 07:50 AM.
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Old Today, 10:24 AM   #4130
maikel76 is offline maikel76  Thailand
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Quote:
Originally Posted by warrjon View Post
I have it on my Rega RP8/Aphetta and it is brilliant.

My thoughts - it sounds clean but not bright. I was very surprised I was not sure what to expect.

I have not run my Rega with any other phono preamp. My Linn LP12 had a IITOK and Troika with a Linn preamp and the Rega/Phonoclone kills it with imaging, warmth, detail and Bass.
Thank you for your impressions Warrjon.
That sounds very good and promising.
My Thorens is somewhat the same as your LP12 so it might be a good comparison.
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