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Old 4th September 2014, 08:34 PM   #91
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I just got my Jelco SA-370H tonearm in the mail. The only thing I'm missing as a birthday present is the time to put all this stuff together.

BTW - my setup will be single ended/unbalanced to start.
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Old 4th September 2014, 08:45 PM   #92
kamis is offline kamis  Serbia
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Properly wired and grounded unbalanced phono stages have almost zero residual hum with pot. at maximum.
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Old 4th September 2014, 09:19 PM   #93
SY is offline SY  United States
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Quote:
Originally Posted by kamis View Post
All the mentioned balanced input IC-s have very high input bias current which is not healthy for cartridges.
A few microamps? No, that's nothing even vaguely unhealthy.

I might be a bit wary of noise current for higher impedance (e.g, MM) cartridges, though.
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Old 5th September 2014, 03:15 AM   #94
nezbleu is offline nezbleu  Canada
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Quote:
Originally Posted by scott wurcer View Post
I am in the process of rewiring a Thorens TD-160 for differential which I found on the cheap.
I will be curious to hear about your experience with that, having spent some time messing with an old TD-160.

When the rewire is finished what will you use for a balanced phono preamp? One of SY's designs, or something opamp-based?
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Old 5th September 2014, 04:01 AM   #95
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Or maybe not balanced, who knows? Scott follows his own muse, who whispers in his ear constantly....
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Old 5th September 2014, 06:31 AM   #96
ahaja is offline ahaja  Poland
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Maybe something like this: Husarz - My Photo Gallery
I made it at the beginning of the year:
first stage with ssm2019 + servo >> passive 2122Hz/50kHz and second stage with composite single opamp + LT1010 with active 50/500Hz.
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Old 5th September 2014, 08:16 AM   #97
kamis is offline kamis  Serbia
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Quote:
Originally Posted by SY View Post
A few microamps? No, that's nothing even vaguely unhealthy.

I might be a bit wary of noise current for higher impedance (e.g, MM) cartridges, though.
To quote Ben Duncan , a British audio expert: ,,Very small direct current(2microampers) will offset the magnetic material BH curve from its linear region and we can expect an increase in distortion and related maladies, particularly when tracking high level passages,,.
Always is better to avoid any risk.
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Old 5th September 2014, 11:37 AM   #98
SY is offline SY  United States
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Think carefully about how a cartridge is constructed. I think that either you're taking Duncan out of context or that he's all wet here.
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Old 5th September 2014, 03:24 PM   #99
kamis is offline kamis  Serbia
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Quote:
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Think carefully about how a cartridge is constructed. I think that either you're taking Duncan out of context or that he's all wet here.
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Old 5th September 2014, 03:29 PM   #100
SY is offline SY  United States
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OK, so the latter. He just waves his hands and asserts, no data, no analysis.

edit: 1.4uA max offset current for a 1512. Bias current is irrelevant for balanced connection. SSM2019 has 0.001uA as typical, 1uA as max.
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