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Old 9th October 2013, 02:34 AM   #11
sjhomey is offline sjhomey  United States
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Join Date: May 2010
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Thanks 6L6
The more I think about it and after reading about all the fakes around, I think maybe I will stick with the Vishays. I know I can get them from reputable dealers. I am starting to wonder about the 2SK170/2SJ74 I have. Do you know of reputable dealers selling them? I see FETAudio mentioned as a good source. Do you know of others? Thanks again.
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Old 9th October 2013, 03:25 AM   #12
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The diyAudio Store will be stocking limited numbers of the Linear System's LSK170/LSJ74.
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Old 8th November 2013, 04:28 PM   #13
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Location: Qax
Hi folks!
Maybe it's a dummy question but I found slight difference between two F5 amplifiers schematics. At least it should be 4.2V on left image. Also there are two capacitors on PCB board. Which one is correct one or better one?

And which PCB board do you prefer for this amp. I'm trying to make a short cut.
Click the image to open in full size.

Last edited by Insanoff; 8th November 2013 at 04:52 PM.
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Old 11th August 2015, 06:23 AM   #14
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Join Date: Jun 2013
Could anyone provide the F5 V3.0 BOM?(2013-11-21 cviller layout)
Especially the "R35" on the PCB board.
Thanks a lot.
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Old 22nd December 2015, 02:24 PM   #15
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Join Date: Mar 2007
Do not try to use the RURG8060 for Class A power supply. I almost finnished my F5 Turbo V 3. Tried with a vario. The vario got hot and never more then ca, 0,8 vdc came to capacitors. They was oscillating no doubt.

: headshot:
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Old 26th February 2017, 10:40 AM   #16
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Join Date: Sep 2016
Location: Delhi
Guys I have a 0-18V X 2 secondaries toroidal transformer rated @ 600VA, do you think I can use it...

Last edited by kpsthakur; 26th February 2017 at 10:45 AM. Reason: updated for specs
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Old 26th February 2017, 12:42 PM   #17
6L6 is offline 6L6  United States
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Old 26th February 2017, 05:30 PM   #18
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Location: Delhi
Originally Posted by 6L6 View Post

Thank you...I just didn't want my dream F5 to go up in smoke...

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Old 28th February 2017, 07:36 PM   #19
GordR is offline GordR  Canada
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Join Date: Nov 2016
Default up in smoke

Looking for some help. I just finished assembling F5 amp using v3 boards/schematic and when I powered up to check/set bias things went up in smoke! In particular R7 and R8 lit up and Q1 and Q2 "popped". Looking at board it appears a few other resistors got hot too...R14, and R4 showing discoloration.

I have double checked, triple checked component placement/polarity and am coming up with nothing.

Any input would be greatly appreciated!
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Old 2nd March 2017, 01:16 PM   #20
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Location: Minnesota
I would try asking at the F5 Build guide thread for help:
An illustrated guide to building an F5
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