R1 values with 1 Tx & 1 reg. are:
Left 2k76
Right 3K06
The 2nd Tx has arrived, do you want the new measurements with 2 Tx & 2 regs.?
Left 2k76
Right 3K06
The 2nd Tx has arrived, do you want the new measurements with 2 Tx & 2 regs.?
I believe it would only be needed if you change vout from the shunts.
I will recalculate based on these values and let you know latter.
I will recalculate based on these values and let you know latter.
Salas, I mesured some 170V' s, here is what I got:
16.61
12.71
14.09
12.60
13.14
12.88
12.86
11.67
13.98
14.74
12.73
15.03
17.70
13.48
14.28
12.25
What do you think?
Sorry Merlin, no 10.5ma yet.
16.61
12.71
14.09
12.60
13.14
12.88
12.86
11.67
13.98
14.74
12.73
15.03
17.70
13.48
14.28
12.25
What do you think?
Sorry Merlin, no 10.5ma yet.
If you shut it down and turn both at 3k3, then power up and measure at BC550's collector, what are the voltages? Because you can set the voltages in other ways (by trimming R source) and not create much different custom Riaa networks between channels.
I would say betewen 12 and 15 ma.
Do you want to mesure more?
Any ideas what to do with them in a phono?
Will we get better results than with bl?
Measure some more if you can. You know, if the centre has a +/- 2mA useful spread it will no be much productive for calculating or building around them a general schematic. Comes down to hand picking and adjusting values around each build then. Its they can give more gain around the head amp but I don't know yet if they will be a better thing overall, or it will be just adjusting for them, have to experiment a bit with simulation. Their Ciss could be higher though. Lower noise and THD are possible on the other hand.
Some good Greek recipe, I would guess.....
I'm going to cook some bucatini all'Amatriciana too for some friends before the big match Chelsea vs Inter tonite! 😉
Some good Greek recipe, I would guess.....
I'm going to cook some bucatini all'Amatriciana too for some friends before the big match Chelsea vs Inter tonite! 😉
Forza Inter🙂
We have to balance. Both are strong, but left is a problem. There must be 12mA running on the left and 11mA on the right. We wanted around 10mA. What you have for R2? One resistor or a combination? What multiturn trimmers you have in hand? Having any 50-100R? Or any small resistors?
For R2 I have a fixed Shinkoh 15R, do you want that I measure the real value?
I have 3 trimmers 100R, which value to be selected?
I have 3 trimmers 100R, which value to be selected?
I would just need to add 1-2R to the left channel. That will not give much control if putting in series, if the Shinkoh were 27R we could parallel the trimmers and have control. Or maybe you have LSK that matches better the right for bias on the circuit? That would be easier... Say if you put an LSK that brings around 9.5V to the left, we can keep 3.3k R1 steady and matched between channels so Ricardo can reference. You got them on pins, yes?
I only have the last seven LSK389 on hand with the following Idss:
1- 7.25-7.02
2- 7.42-7.50
3- 7.83-7.82
4- 8.05-9.24
5- 9.23-9.29
6- 9.29-9.28
7- 9.32-9.25
No problems all with sockets
1- 7.25-7.02
2- 7.42-7.50
3- 7.83-7.82
4- 8.05-9.24
5- 9.23-9.29
6- 9.29-9.28
7- 9.32-9.25
No problems all with sockets
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Try 5-6-7 on the left channel. Easily exchangeable on multi pin sockets? Don't touch R1s, leave them at 3.3k matched between channels, try to see which one brings the reading on BC550 collector nearer to that 9.4V you got on the right side.