Knowing a few nF caps against a precision machine is an alternative cheap way. So to know how much it adds or subtracts roughly.
Or to pay vendor to match...
I believe you, a friend bought a very expensive TT the VPI HRX full but the setup was horrible & the sound too, now after a very good setup between the SME V & the TT sounds nice, like VTA some degrees more or less changing all the sound to well or to bad & after to complicatd more the things every LP needs a special VTA, so to become fool....
Knowing a few nF caps against a precision machine is an alternative cheap way. So to know how much it adds or subtracts roughly.
Or to pay vendor to match...
How can get these knowing nF caps?
Don't remember me the match pairs resistors paids to Pcx
I simulated changes part by part using Spice, than I listened to the effect of each change (iron in hand) and recorded it in the correspondent graph.
That is how I could "visualize" the effect of each component alone.
Than I realized there are some constants that relate the several components in pairs and my actual approach is somehow different:
1st - measure all components (and match pairs)
2nd - calculate the minimum error using the spreadsheet
3rd - build a test board with slack in the caps so you can trim just by adding new ones (best start with 46n and 15n)
4rd - using shunts, experiment with small valued caps to finetune.
I consider myself experienced now
That is how I could "visualize" the effect of each component alone.
Than I realized there are some constants that relate the several components in pairs and my actual approach is somehow different:
1st - measure all components (and match pairs)
2nd - calculate the minimum error using the spreadsheet
3rd - build a test board with slack in the caps so you can trim just by adding new ones (best start with 46n and 15n)
4rd - using shunts, experiment with small valued caps to finetune.
I consider myself experienced now
OK by me Ricardo. I am not opposing, since the values you suggest don't show significant deviation from Lipshitz core values I give. I have simulated one of your suggestions to Merlin. Graphically they show very subtle changes to my original curve's trend. Nothing technically untoward. Of course he has another system than yours and mainly different speakers and room. So you will get feedback etc.
Well, that is another story.... My wife believes there must be a different kind of TT for each type of music... I already have three in my living room... One for organ pieces... another for small group jazz... All of them sound different but sumptuous
Only if you know someone with excellent calibrated LCR, you send some caps, and he writes values on them. Its a matter of trust if a vendor offers.
Ok
Thank you Salas..... I must be sure my tech works for all... that is why I am pushing the envelope so far.
LU1014D jfet output circuit?
So far most of what i have read in the forums using jfets, uses them as low noise drivers and preamps. Does anyone know of circuits which would work using , for example, LU1014D jfets in the OUTPUT stage? I ask this becuase im interested in comparing the power jfet output amp sound with the small low voltage tube amps I have made using 12k5 tubes, etc. I could build and tweak one on my own, but i wanted to save time on that project. Something like an output cascode, or ccs load, or transformer coupled circuit? Thanks much.
So far most of what i have read in the forums using jfets, uses them as low noise drivers and preamps. Does anyone know of circuits which would work using , for example, LU1014D jfets in the OUTPUT stage? I ask this becuase im interested in comparing the power jfet output amp sound with the small low voltage tube amps I have made using 12k5 tubes, etc. I could build and tweak one on my own, but i wanted to save time on that project. Something like an output cascode, or ccs load, or transformer coupled circuit? Thanks much.
Yes sound better, more focused but still laid back/soft for mine taste (possible due to the carbon film used, but I don't know the real reason), the most impressive thing now is that both channels seems more equilibrated like with the same gain.
Salas in a back post you tell me to tweak R3 47K adding 2.2Meg so you wat to reach 46K017, instead two resistors not will be better to order Michael Percy Audio an exact value in only one resistor the TX2352 "nude" Vishay Bulk foil allow two - four weeks & cost 15$35 each.
In general I don't trust in vendors. I don't know someone with excellent calibrated LCR, do you have or do you know someone can do, still by paying?
That resistor suggested by Salas will give big presence... experiment with whatever you have at hand just to pick up the better value.
So for resistors you want to reach?
LEFT
R3 45K473
RIGHT
R3 45K675
Will be better only one resistor instead two, right? possible will order a Vishay with exact value to Michael Percy.
What about if I change R5 for Caddok MK132?
LEFT
1Meg001 or 1Meg002
RIGHT
1Meg001 or 1Meg002
Please tell me wich will be better for each channel? I have to change the rest of components if I will change?
Ricardo for R3 you suggested:
Left 45K473
Right 45K675
Salas for R3 suggested:
Left & Right 46K017
I don't know a lot of about electronics but I'm very curious, why are different values?
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