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Old 23rd May 2017, 09:46 AM   #951
Benji90 is offline Benji90  Italy
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Thank you Zen Mod. I have a tube pre with, from what I understand, lot's of voltage swing but not may current capabilities, so I thought that a higher input impedance could help. I have no idea about my cables capacitance. Anyway it can be quite an interesting experimentation!
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Old 23rd May 2017, 09:48 AM   #952
Zen Mod is offline Zen Mod  Serbia
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Old 23rd May 2017, 01:46 PM   #953
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Benji90 View Post
Thank you Zen Mod. I have a tube pre with, from what I understand, lot's of voltage swing but not may current capabilities, so I thought that a higher input impedance could help. I have no idea about my cables capacitance. Anyway it can be quite an interesting experimentation!
The input impedance has virtually no effect on the cable capacitance effects.
It's the Source impedance that most affects the cable capacitance effects. This becomes a low pass filter, which you can use to attenuate RF interference if you know the impedances

The Receiver impedance does affect the high pass filter effect created by the DC blocking capacitor.
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Old 17th June 2017, 11:26 PM   #954
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Question about matched pairs of 2SK170/2SJ74 for the F4 amps. I have a bunch of each of these that i bought a few years ago for the burning amps etc, they are A's . The matched pairs of 2SK170/2SJ74 from the diystore are out of stock. Should I wait for them to come back in stock or just make up pair up pairs from the A series that i have? Am I gambling on performance?
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Old 18th June 2017, 12:00 AM   #955
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What's the Idss of your grade A pairs?
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Old 18th June 2017, 12:18 AM   #956
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both the 170's and the 74 A's are 2.6-6.5
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Old 18th June 2017, 12:33 AM   #957
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i mean the actual Idss as tested
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Old 18th June 2017, 12:57 AM   #958
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http://www.diyaudio.com/forums/attac...urement-v1.pdf
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