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Old 20th April 2010, 07:44 PM   #3601
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Mine DVM read 0V.
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Old 20th April 2010, 08:05 PM   #3602
Salas is offline Salas  Greece
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Bad situation.
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Old 20th April 2010, 09:16 PM   #3603
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you need a better ones
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Old 20th April 2010, 09:17 PM   #3604
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Worse, now the leds of the right channel of the RIAA do not lit
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Old 20th April 2010, 09:36 PM   #3605
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Quote:
Originally Posted by nicoch46 View Post
you need a better ones
Sure, could you tell a better one not very expensive?
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Old 20th April 2010, 09:48 PM   #3606
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by vgeorge View Post
R3 = 43,06 and 42,95 takman carbon
R4 = 6,829k and 6,835k shinkoh
c2 = 47,05n and 47,01n Obligato // silver mica
c3 = 16,009 and 16,013 Russian silver mica // silver mica
(C2 and C3 can be adjusted to lower values)

Also thinking to try for C4 a Hovland instead of the usual FT-3(I have both, what do you think?
Taking in consideration your resistor values, I would be happier with C2 = 46.6n.

Can you remove the silver micas ? If so it will sing very well !

If you need finer tune, I would suggest a 2M // 6k835 (R4 Right channel only)

The FT-3 are quite neutral, transparent and extended, but that size

It is an interstage cap so it will leave itīs signature but not affect the riaa curve.... Use the Hovland and report latter please

Last edited by RCruz; 20th April 2010 at 09:57 PM.
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Old 20th April 2010, 11:06 PM   #3607
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Question Leds don't lit right channel

I measured right channel (Leds don't lit):

Leds 0.001V BAD
R17 340mV OK
R10/Q2 10.06V OK
R1/Q3 49V BAD
R7/GND 10V OK
DRAIN Q5/GND 21.1V OK

It's possible the problem are the Leds, so only changing the Leds for news solve the problem?
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Old 20th April 2010, 11:36 PM   #3608
Salas is offline Salas  Greece
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Change q6 maybe. You took it out because you allowed 49V. Go down to 45V first.
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Old 21st April 2010, 05:26 AM   #3609
vgeorge is offline vgeorge  Greece
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Quote:
Originally Posted by RCruz View Post
Taking in consideration your resistor values, I would be happier with C2 = 46.6n.

Can you remove the silver micas ? If so it will sing very well !

If you need finer tune, I would suggest a 2M // 6k835 (R4 Right channel only)

The FT-3 are quite neutral, transparent and extended, but that size

It is an interstage cap so it will leave itīs signature but not affect the riaa curve.... Use the Hovland and report latter please
Thanks Cruz!

Nothing is soldered yet. Trying to match components.
If I remove the micas I have 46.6n and 46.4n so I wil add 200p to one chanell only.
I have spare FT-3 also. This is what I am using now, but I found these on my stach and wanted to hear opinions. So I will try them and see. FYI these are about the same lenght as FT-3, only slimer!
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Old 21st April 2010, 11:41 AM   #3610
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Quote:
Originally Posted by Salas View Post
Change q6 maybe. You took it out because you allowed 49V. Go down to 45V first.
Ok now I have 45V, I changed Q6 SK170BL with 9,26 Idss that' maximum mA that I have on hand, Leds lit but R1/Q3-GND have 40,03V
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