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Old 16th March 2010, 06:31 PM   #3291
massimo is offline massimo  Italy
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Originally Posted by vgeorge View Post
Now I have to cook for my other half!

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!
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Old 16th March 2010, 06:39 PM   #3292
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Stg
Salas The Greek
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Old 16th March 2010, 07:04 PM   #3293
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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.
With R1 3K3:

Left 6.8V
Right 9.4V
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Old 16th March 2010, 07:04 PM   #3294
Salas is offline Salas  Greece
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Waiting for Spanish R1 values... OK, here they are.
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Old 16th March 2010, 07:04 PM   #3295
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Originally Posted by massimo View Post

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
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Old 16th March 2010, 07:15 PM   #3296
Salas is offline Salas  Greece
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Originally Posted by merlin el mago View Post
With R1 3K3:

Left 6.8V
Right 9.4V
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?
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Old 16th March 2010, 07:24 PM   #3297
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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?
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Old 16th March 2010, 07:30 PM   #3298
Salas is offline Salas  Greece
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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?
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Old 16th March 2010, 07:46 PM   #3299
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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

Last edited by merlin el mago; 16th March 2010 at 07:49 PM.
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Old 16th March 2010, 07:47 PM   #3300
Salas is offline Salas  Greece
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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.
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