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Converting a Threshold S300 to SA/3?
Converting a Threshold S300 to SA/3?
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Old 23rd February 2013, 04:45 AM   #21
VintageAmp is offline VintageAmp  United States
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Funny I came across this looking for something else.. ha ha
The S 200 used a 330VA XFMR that has different taps. The S200 benefits most from larger main caps and a FRED (IXYS) rectifier.
Class A will tend to have a more laid back presentation and the higher register frequencies will be cleaner. In other words any harshness or grain is eliminated.
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Old 21st February 2017, 04:24 PM   #22
RICH MOORE is offline RICH MOORE
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Default Threshold s/300

Can you guys help here a little. My Nakamichi PA-7 gave up the ghost in a rather large and smoky manner. So i bought a Threshold s/300 in mint condition. Optical bias, serial # 2004. How do I find out its manufacture date? Where do I get a schematic/ service manual? Although the amp is working fine, I would like to go through it and replace caps, any known noisy transistors etc. i am an amateur electronics hobbyist, so this should be no problem. Any suggestions on what should be done and what replacement parts to use? I will be pairing this up to a very rare set of RTR DR-1's, again in mint condition. Rich rmatlantis@cox.net
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Old 21st February 2017, 05:46 PM   #23
Nelson Pass is offline Nelson Pass  United States
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Converting a Threshold S300 to SA/3?
Here's what I have.
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File Type: jpg THR 89A.jpg (163.8 KB, 75 views)
File Type: jpg THR 89B.jpg (142.4 KB, 75 views)
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Old 21st February 2017, 11:31 PM   #24
RICH MOORE is offline RICH MOORE
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Default thnks

Thanks for getting both these to me.
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