Now HV B+ 260V sounds far better.
26dBs Hagerman Piccolo MC pre pre + 40dBs Puresound P10 it's a lot of gain for my Denon DL103R 0.3mV so still hear hum noise from tx, it's normal?
26dBs Hagerman Piccolo MC pre pre + 40dBs Puresound P10 it's a lot of gain for my Denon DL103R 0.3mV so still hear hum noise from tx, it's normal?
I don't know more of how get ride the hum, now is less less noise than with wrong HV B+ so I consider conrrectly is due to the high MC+MM total gain, when arrives Bartolucci tx lets see what's happen with this residual hum but surely with other cart with less gain can't hear the hum.
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Hi,
See my note above. Systematically short the signal, stage by stage, from the input jacks onwards...
You will be able to pinpoint where the noise gets in. Then you can try to get it out.
Ciao T
See my note above. Systematically short the signal, stage by stage, from the input jacks onwards...
You will be able to pinpoint where the noise gets in. Then you can try to get it out.
Ciao T
Fixed hum, I use original Puresound PSU that's connected the HV with filaments: I used only the HV & other Tx & PSU for filaments so this is the noise problem, now I use also Puresound PSU for filaments & is dead quiet🙂
Ricardo, sounds very very good, seems that Guy have reason about RIAA but if you want I'm open to your RIAA fine tune
Ricardo, sounds very very good, seems that Guy have reason about RIAA but if you want I'm open to your RIAA fine tune
Guy´s values are ok.... if you want I can make a simulation just to see if I get the same results.
Post your actual DMM measured values.
Post your actual DMM measured values.
Are the same post 1
Left channel
R1 329K CADDOCK TF020R
R19 998K CADDOCK TF020R
C9+C8 .00270 paralleled .000106 = 2.806nF teflon film & aluminium foil
R17 38K9 CADDOCK TF020R
C7 .006 paralleled .0022 = 8,2nF teflon film & aluminium foil
R18 99R9 SHINKOH
Right channel
R1 329K CADDOCK TF020R
R19 999k CADDOCK TF020R
C9+C8 .00270 paralleled .000106 = 2.806nF teflon film & aluminium foil
R17 38K9 CADDOCK TF020R
C7 .006 paralleled .0022 = 8,2nF teflon film & aluminium foil
R18 99R9 SHINKOH
Thank you Ricardo
Left channel
R1 329K CADDOCK TF020R
R19 998K CADDOCK TF020R
C9+C8 .00270 paralleled .000106 = 2.806nF teflon film & aluminium foil
R17 38K9 CADDOCK TF020R
C7 .006 paralleled .0022 = 8,2nF teflon film & aluminium foil
R18 99R9 SHINKOH
Right channel
R1 329K CADDOCK TF020R
R19 999k CADDOCK TF020R
C9+C8 .00270 paralleled .000106 = 2.806nF teflon film & aluminium foil
R17 38K9 CADDOCK TF020R
C7 .006 paralleled .0022 = 8,2nF teflon film & aluminium foil
R18 99R9 SHINKOH
Thank you Ricardo
I would do the following:
R1 329K // 7M = 314231r
R17 38K9 // 2M7 = 38341r
C7 6n // 2.2n // 90pF = 8.29nF
That would be perfect admiting internal resistance of the first valve is 70k sharp... But we do not know that for sure so if you feel it is ok now, just let it be as is.
R1 329K // 7M = 314231r
R17 38K9 // 2M7 = 38341r
C7 6n // 2.2n // 90pF = 8.29nF
That would be perfect admiting internal resistance of the first valve is 70k sharp... But we do not know that for sure so if you feel it is ok now, just let it be as is.
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I want to reduce 6dBs with a voltage divider at the input of the Puresound P10 40dBs because the pre-pre used have 26dBs for 0.15mV output carts but my Denon DL103R gives 0.29mV.
Will be correct a voltage divider of two resistors of 1 Ohm each (Z1 & Z2) to drop 6dBs? Zload will be the Puresound.
Will be correct a voltage divider of two resistors of 1 Ohm each (Z1 & Z2) to drop 6dBs? Zload will be the Puresound.
Attachments
The cartridge will see about 2ohm load then!
I don' t think 66db is too much for the 103.
Pass uses around 73db on his mc preamplifiers.
I don' t think 66db is too much for the 103.
Pass uses around 73db on his mc preamplifiers.
I'm thinking to put the voltage divider in the Puresound MM not in the pre-pre MC.
My 103R have 0.29mV instead 0.25mV, there is something wrong or needs more break-in because I don't hear very well the extremes (lows and highs), all caps RIAA + interstage + outpout are teflon FT3. Sounds very clear and fast with micro-detail information but needs open more the lows & highs surely it's a break-in matter.
My 103R have 0.29mV instead 0.25mV, there is something wrong or needs more break-in because I don't hear very well the extremes (lows and highs), all caps RIAA + interstage + outpout are teflon FT3. Sounds very clear and fast with micro-detail information but needs open more the lows & highs surely it's a break-in matter.
Still, one voltage divider with such a small value, you are going to loose resolution. Also, even the pre-pre will have a hard time to drive 2 ohms!
If you are not overloading the input stage do not worry about that.
Try first as is. If you do not like the sound, something else is wrong.
If you are not overloading the input stage do not worry about that.
Try first as is. If you do not like the sound, something else is wrong.
I connected a Salas 20dBs single njfet per channel pre-pre battery powered instead the Piccolo & the sound is wonderful so the Puresound MM isn't wrong, also connected the Piccolo to Rotel MM & sounds OK.
Surely Pass uses MC with 73dBs of gain because uses ultra low MC carts 0.1 mV or less.
Surely Pass uses MC with 73dBs of gain because uses ultra low MC carts 0.1 mV or less.
Hi Merlin
Try reducing cart load... it will make sound more even and will pull output down also.
What cart loading are you using for the 103r ?
Try reducing cart load... it will make sound more even and will pull output down also.
What cart loading are you using for the 103r ?
Hi Ricardo,
Piccolo have 470R because my friend uses a Linn Troika, I will try to reduce to 220R or 150R to see what's happen.
Thanks
Felipe
Piccolo have 470R because my friend uses a Linn Troika, I will try to reduce to 220R or 150R to see what's happen.
Thanks
Felipe
I changed the load resistor for 150R, Piccolo load resistor was 560R instead 470R still worse, I will let you know whta's happen loaded with 150R.
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