variable voltage drop down to 8v, idss dipendent ,10ma to 7ma
% match max ? ie 7,6 -7,8 are ok?
% match max ? ie 7,6 -7,8 are ok?
probabile my stupid problem are only dmm battery , I just remenber without dmm in series ,and analog tester on v ,I dont see any drop !!!!
I will repor later, thanks a lot as always😉
I will repor later, thanks a lot as always😉
I didn't really understand the problem, but could it be sudden increase in current that causes voltage drops at those points? Also, if any parts get too hot, some of the current passing properties change quite a bit.
match done not so lucky
How can be the idss difference from channel ?
A----
k6.70-k6.70
k6.84-k6.91
b----
j7.72-k7.77
j7.90-k7.90
c----- but can be better for audio
j7.91-k7.90
j8.02-k8.02
d--- but losting the up combo for audio
k8.00-k8.02
k8.08-k8.09
e----- if idss is not too higth this are the better
k8.26-k8.27
j8.38-k8.37
with one ?
How can be the idss difference from channel ?
A----
k6.70-k6.70
k6.84-k6.91
b----
j7.72-k7.77
j7.90-k7.90
c----- but can be better for audio
j7.91-k7.90
j8.02-k8.02
d--- but losting the up combo for audio
k8.00-k8.02
k8.08-k8.09
e----- if idss is not too higth this are the better
k8.26-k8.27
j8.38-k8.37
with one ?
Yes, good choices. Remember that R6 mod at this voltage you use is going to stress the BJT if not mini sinked.
just for fun or crazy
how mix for channel balance a-- and e-- jfet ?
ie: lower a-- idss for Q5 with higth e-- idss for R6mod
how mix for channel balance a-- and e-- jfet ?
ie: lower a-- idss for Q5 with higth e-- idss for R6mod
Prefer the lowest Idss for Q5. If you have a couple of GR 4-5mA, even better. There is a reason. The lower the idss, the lower the pinch off, and more the breathing space under Vbe. But we don't want too low, so to keep the Zener working strong enough.
Hi Salas
I am using 8mA jfets on Q5 (below the zener)... should I replace those by some 4-5mA ?
Ricardo
I am using 8mA jfets on Q5 (below the zener)... should I replace those by some 4-5mA ?
Ricardo
Yes, you can save the stronger ones for audio like the RIAA. Maybe you have some low ones that don't batch with the others, and can serve better as shunt's Q5s.
More voicing....
Hi Salas
After replacing the signal cord between 101pre and 103amp with a specially built with silvered 5 pin din and mogami wire, I noticed a good increase in detail.
This detail is welcome in the CDP and the Tuner but the Riaa now sounded a little forward and piercing in the highs.
I reinstaled the stock cable and althou I had no edgy sound, I really missed the added detail.
So I decided to reinforce the bypass on riaa C3 and my first impressions are favorable but I am afraid to be altering the riaa curve.
I have the following values:
C2 = 47.36nF (as measured with the DMM)
C3 = 16.23nF (15720 + 330 + 120)pF
C2/C3 = 2.918 (Looks good)
Am I creating some kind of distortion or time skidding? (The resistors are 47k and 6k8 kiwames 1%)
Acording to http://www.beigebag.com/case_riaa_5.htm I should reduce the resistor values to 46150 and 6720 ohm to reach optimum values but that is not practical.
Ricardo
Hi Salas
After replacing the signal cord between 101pre and 103amp with a specially built with silvered 5 pin din and mogami wire, I noticed a good increase in detail.
This detail is welcome in the CDP and the Tuner but the Riaa now sounded a little forward and piercing in the highs.
I reinstaled the stock cable and althou I had no edgy sound, I really missed the added detail.
So I decided to reinforce the bypass on riaa C3 and my first impressions are favorable but I am afraid to be altering the riaa curve.
I have the following values:
C2 = 47.36nF (as measured with the DMM)
C3 = 16.23nF (15720 + 330 + 120)pF
C2/C3 = 2.918 (Looks good)
Am I creating some kind of distortion or time skidding? (The resistors are 47k and 6k8 kiwames 1%)
Acording to http://www.beigebag.com/case_riaa_5.htm I should reduce the resistor values to 46150 and 6720 ohm to reach optimum values but that is not practical.
Ricardo
Our Riaa values include the first stage output impedance and second stage loading. Also they are judiciously voiced a bit, so don't go with calculators. In general, I don't think that is a good idea to tweak basic Riaa tonality just to allow for interconnects that you will change again maybe in the future or they will settle softer in a while etc.
Why don't you readjust your VTA first? It is possible that the silver new connector part is a bit over the top for detail, so it could be counteracted that way.
Why don't you readjust your VTA first? It is possible that the silver new connector part is a bit over the top for detail, so it could be counteracted that way.
Thank you Salas.
I will now rollback this mod.... I noticed odd effects (less stage width and unconfortable mid range).
I will verify VTZ and also the cart loading.
Ricardo
I will now rollback this mod.... I noticed odd effects (less stage width and unconfortable mid range).
I will verify VTZ and also the cart loading.
Ricardo
Just removed the aditional 120p cap on C3 and the stage widened and got taller instantly.
The odd mid freq effect also vanished.
I love the über detail... 😉
Ricardo
The odd mid freq effect also vanished.
I love the über detail... 😉
Ricardo
The riaa is so detailed I can easily set up VTA. Why did I not remenber this in the first place ?
I lowered the arm .3mm and all the harshness went away.
Once again I should have known better
The sound is now better than ever.
I am quite sorry to have reported my previous mod that should never have happened. (Feeling like a
)
Ricardo
I lowered the arm .3mm and all the harshness went away.
Once again I should have known better
The sound is now better than ever.
I am quite sorry to have reported my previous mod that should never have happened. (Feeling like a
)Ricardo
Nichicon
Today I received from China two 15000uF 63V Nichicon (M) labelled as Marantz.
I bought them believing these were Gold Tune KG caps but the label only states "Marantz"
The size does not appear on nichicon site but they are heavy and look great.
Only 30 minutes after replacing the 10.000uF BHC by these, I noticed lower noise floor and much better bass......😉
Outstanding sound
Ricardo
Today I received from China two 15000uF 63V Nichicon (M) labelled as Marantz.
I bought them believing these were Gold Tune KG caps but the label only states "Marantz"
The size does not appear on nichicon site but they are heavy and look great.
Only 30 minutes after replacing the 10.000uF BHC by these, I noticed lower noise floor and much better bass......😉
Outstanding sound
Ricardo