2SK170 2SJ74 F-5 BOM?????? - diyAudio
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Old 4th July 2013, 01:46 AM   #1
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Join Date: Nov 2005
Location: Sarasota FL
Default 2SK170 2SJ74 F-5 BOM??????

What will drop in? Just purchased the boards and the BOM has obsolete parts, replacements are not available and recomendations are years behind.
Cascoding?

Thanks
Paul
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Old 4th July 2013, 02:38 AM   #2
expert in tautology
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In Swap meet some folks are selling the requiste JFETs at this time, if they are not sold out...

... but you might want to start a separate thread in the PASS section asking the question...

...the short answer is that cascoding would permit somewhat lower voltage devices to function... but the IDSS and the Yfs would need to end up being close to the original parts, and also the linearity ought to be comparable to the original parts for best results.

...the opinions I express are without the benefit of credibility or the blessings of the management or staff...

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http://www.bearlabs.com -- Btw, I don't actually know anything, FYI -- [...2SJ74 Toshiba bogus asian parts - beware! ]
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Old 4th July 2013, 03:26 AM   #3
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What IDSS do you need ? may have a few pulls that I can spare

Thanks

Peter
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Old 4th July 2013, 05:37 AM   #4
secanbj is offline secanbj  Sweden
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Join Date: Sep 2003
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you did not search much for the answer did you? anyway

Hannes have a complete kit offer for the F5
F5 amp transistor kit

or if you just want the ones you ask for Spencer is a trusted sorce
Store | FET Audio

Scroll down a litttle and you will see that he has matched ones. At the end of that page you find his email and how to proceed

Regards
Anders
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Old 4th July 2013, 01:08 PM   #5
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Default Thanks for taking the time to reply.

Thanks for taking the time to reply!!!!

I do not work with the transistors enough to design or make modifications. I do have the time now, but not the money. So I have to stay with direct replacements.

The kit is a bit pricey. FETAudio may be a way to go, if he is reliable as you say. These transistors, apparently, are not being made. So I guess I need to find out if they are from China or NOS. I will soot him an e-mail. I have had some problems with there parts.

One thing I was not aware of, I need to find matched transistors between channels, did not know that.

A new thread is a good idea. There are 1001 pages plus of info on these F-5 boards. Some are good, but incomplete and most are outdated regarding direct replacements.

SPEAKERS are what I DO MOST!!!!!!

There were recommendations on the J175 and J111. But are these good or just ... Does the circuit need modifications? I do not know enough to feel comfortable using them with my limited knowledge.

http://www.mouser.com/ds/2/149/J175-189347.pdf

http://www.mouser.com/ds/2/149/J111-188753.pdf

I sent FETAudio an e-mail.

Thanks so much for the replies!

Paul
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Old 19th July 2013, 07:04 AM   #6
superR is offline superR  Netherlands
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I too, have only access to J1xx JFets, but I have no idea whether they are swappable with the 2SK380 and 2SJ106.

Any news from FETaudio?
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