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Valve Itch phono
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Old 25th October 2011, 01:54 PM   #491
RCruz is offline RCruz  Switzerland
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Valve Itch phono
Look here: http://www.diyaudio.com/forums/analo...nsformers.html
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Old 25th October 2011, 02:44 PM   #492
merlin el mago is offline merlin el mago
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Thanks Ricardo, still not clear wich one is the input or output?

Felipe
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Old 25th October 2011, 03:32 PM   #493
merlin el mago is offline merlin el mago
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Default Partridge 977

kevinkr give me the answer: the red pin is the output and the gold/yellow is the input
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Old 25th October 2011, 04:04 PM   #494
merlin el mago is offline merlin el mago
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DL103R (0.29mV output) + Partridge 977 1:6 + Valve Itch 48 dBs will be enough gain?
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Old 25th October 2011, 04:51 PM   #495
Salas is offline Salas  Greece
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Yes.
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Old 25th October 2011, 05:07 PM   #496
merlin el mago is offline merlin el mago
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Ufff, thanks Salas now I am calm.
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Old 25th October 2011, 05:47 PM   #497
woodturner-fran is offline woodturner-fran  Ireland
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For anyone else - the linked pins are the grounds. If you measure the resistances, the input side has a resistance of about 25-30R and the output side is higher, can't remember, but significantly higher.

BTW, I broke the link between the grounds - there was some discussion on this back earlier in the thread, about pg 10-15 something like that


Fran

EDIT: my cart is 0.35 and its plenty loud enough with the partridge 977....
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Old 25th October 2011, 05:59 PM   #498
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by woodturner-fran View Post
See the sch in the pic below:

Click the image to open in full size.

He ties gnd on the primary side to gnd on the secondary. Salas, I note you didn't do this in your schematics, although there was some discussion about it back a little. Both version of yours are working fine? No need to follow that common gnd?


Made more progress tonight. The transformer box is done, next up is the umbilical from phono box to transformer box. Then I can start on the circuit itself - thanks to the arrival of some nice matched caps from Poros Island......

We will see which is most IMF-affected postal service... I'm already guessing it is the Irish one!


Fran
Quote:
Originally Posted by Salas View Post
It worked better for hum with the primary floating for ''balanced'' transfer, but it worked both ways.
So better don't have connected both gounds & left floating as per Salas advice.

Did you connect the step-up tx to chassis gnd as pic to avoid hum?

Click the image to open in full size.
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Old 25th October 2011, 06:05 PM   #499
Salas is offline Salas  Greece
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You are quoting my findings from another SUT model. You will see when you will have a properly working phono as for what is best with the 977 and your TT grounding.
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Old 25th October 2011, 06:23 PM   #500
merlin el mago is offline merlin el mago
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That's a good advice as always, I will follow experimenting with my own Itch.
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