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First Watt F7 review
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Old 16th May 2018, 01:33 PM   #1201
Zen Mod is offline Zen Mod  Serbia
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Old 16th May 2018, 01:42 PM   #1202
Antoinel is offline Antoinel  United States
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Originally Posted by Soundhappy View Post
What ProFet amp was ?
Selectronic version of Amperotron or Zenotron ?
2A & DIY
Hello Soundhappy. The left schematic in your post is for a like-diyF5 which is configured [at its power output] as a Current Source Amp driving a full range loudspeaker. The schematic on the right is like that of diyF5; namely a Voltage Source Amp. Both schematics and their amps "respect" and stay away from the sensitive commercial nature of F7.
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Old 16th May 2018, 07:14 PM   #1203
Nelson Pass is offline Nelson Pass  United States
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If you parse that article carefully from a technical standpoint, it comes
out flawed.

I have pointed out elsewhere that pcf didn't go very far back then mostly
because the bandwidth of their equipment was poor and they looked to
be trying to achieve the wrong things. But then this was 1957...

You can plug a simple pcf circuit into a simulator and get some very
interesting stuff. Here is the frequency response of an amplifier driving
a simulated speaker with varying amounts of pcf, and this doesn't
begin to address the control offered by a negative damping factor.
Attached Images
File Type: jpg pcf sch.jpg (55.7 KB, 236 views)
File Type: jpg pcf resp.jpg (69.9 KB, 230 views)
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Old 17th May 2018, 04:46 AM   #1204
rookakoma is offline rookakoma  Hungary
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F5 Turbo

Last edited by rookakoma; 17th May 2018 at 05:09 AM.
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