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F5 Turbo Builders Thread
F5 Turbo Builders Thread
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Old 22nd March 2018, 11:46 AM   #5101
joesch1999 is offline joesch1999  United States
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Default B&W 602

Before I purchase these speakers would they be good for the f5 turbo ?
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Old 22nd March 2018, 02:38 PM   #5102
Mooly is offline Mooly  United Kingdom
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F5 Turbo Builders Thread


Posts adding nothing of value to this thread have been deleted. You know who you are !

Reasoned discussion is fine, giving the auto censor a workout to express personal opinion is not.

No more warnings. Keep the discussion on topic.
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Old 22nd March 2018, 04:54 PM   #5103
Hikari1 is offline Hikari1  United States
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Quote:
Originally Posted by joesch1999 View Post
Before I purchase these speakers would they be good for the f5 turbo ?
F5T would be fine unless you listen loud in a very large room with those speakers...but if those were your listening habits you probably wouldn't want a standpoint 2 way anyways.
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Old 25th March 2018, 02:54 AM   #5104
takitaj is offline takitaj  United States
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Thanks Sangram. It looks like I got lucky & jfets survived but they didn't really match all that well so I'm going with some sets of BL Toshibas I had that were perfect matches instead. Both sets tested out at 8.65 - 8.67 ma at 12v with a 10R resistor off the drain.

I changed R5 & R6 to 2.2k when I first built the amps. I was using a single jfet pair per channel then with 4 pair output and wasn't able to get enough bias. I never changed them back when I doubled up the jfets. I changed them back to 1k now.

While I'm at it I also added some 100R resistors between the jfet drains and the cascode emiters as recommended by Mr. Pass. Just for peace of mind.

I'll have to test out P3 when I get it going again. Come to think of it even back when they were a stereo V2 it had the same harshness when it warmed up. I used a new set of mosfets when I split it into monos and used a different set of jfets too, the ones that were in there now. I did reuse the diodes.

Debating changing the thermistor arrangement. I wish I knew why it was done like that.

If I find anything I'll post it.

Last edited by takitaj; 25th March 2018 at 02:56 AM.
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Old 25th March 2018, 02:39 PM   #5105
stereohifi is offline stereohifi  Canada
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Default Pass F5 V2 partial kit on Ebay ??

Mosfet pure class A amplifier thick PCB turbo V2 partial kit !! | eBay

Is someone have experience with this kit ? Would you recommend it?
All transistors are there and boards.
Thinking of making F5 V2 50watts clones.
Thanks
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Old 25th March 2018, 02:42 PM   #5106
6L6 is offline 6L6  United States
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F5 Turbo Builders Thread
Jim's audio makes Pass amp boards without Nelson's permission.

There has never been an official rule made here, but the members of this forum generally don't offer help to users of the Jim's boards for the above reason.
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Old 25th March 2018, 03:13 PM   #5107
stereohifi is offline stereohifi  Canada
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Understood. I was in doubt about the ethics on this particular material offered.
Makes sense.
Thanks again.
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Old 26th March 2018, 08:35 PM   #5108
takitaj is offline takitaj  United States
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The DIY store here sells boards that are Nelson approved. Why not just get them here? Plus your chances for success and support are greatly improved.
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Old 26th March 2018, 11:15 PM   #5109
stereohifi is offline stereohifi  Canada
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Yes my order of F5 V2 T boards are on it's way, thanks.
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Old 6th April 2018, 02:36 PM   #5110
Zatopek is offline Zatopek  Germany
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Default 50/60Hz hum at output

Hello! May I please specifically adress Kyle and Keremito:
I was reading your discussion about the 60Hz hum you have noticed and obviously removed completely by this 2Ohm/2W resistor. As I have such hum myself as well I would like to try your receipe and want to double check to make sure I got you right:

Are you saying, that you are removing the short between the "G"-pad and the "Link"-pad and you are replacing the wire by a 2Ohm resistor?? Correct??

The hum I have is at both channels and it is about 3.5mVrms both sides.
Would appreciate your confirmation.
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