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Old 20th June 2003, 05:08 AM   #11
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Yes, that's it.
If someone chooses to use 18V batteries, R17 has to be 1KOhm.

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Old 21st June 2003, 03:20 AM   #12
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Quote:
Originally posted by arg_
Is it possible that the circuit in question is the one below?
Close enough, and batteries are a great way to go with it.
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Old 12th July 2008, 04:53 PM   #13
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Quote:
Originally posted by Nelson Pass
The Threshold M1 dates back to about 1976, was single-ended and used about 8 parallel devices. I don't seem to be able to find the schematic, but I'll see about recreating it from memory.
I have SME 30/2 turntable, fitted with Ortofon Jubilee cartridge and using Ortofon T 20 MK II moving coil step up transformer on my Audio Research SP10 MK II.
Well what can I tell you? Sounds like dream and I just can't get enough listening my huge record collection..
Time ago I could buy SL10 from a guy in Amsterdam but I had to go on business trip next day so I asked him to keep it for me till I get back. He probably thought I was kidding and sold it.
Anyway.. I was talking to mr. Tiefenbrun (Linn's father) one day, and he told me that any step up transformer beat transistor based head amps hands down..
Since you are Treshold founder and designer of SL 10 I am really interested to hear your opinion on this..
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Old 12th July 2008, 05:47 PM   #14
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Just a casual opinion

The Ortofon T20 falls way below the level of your front end. Many active devices, both tube and SS will certainly sound better. It took me, in fact years to find a step-up transformer that sounds decent and actually better than an active step-up.

Not so sure about most common base circuits as they typically require a large electrolytic coupling cap in a very sensitive position.
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Old 23rd November 2008, 08:21 AM   #15
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jonk
here's the SL-10 schematic.
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