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Old 13th March 2010, 10:54 AM   #431
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Money has just been sent,
Nicolas
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Old 24th March 2010, 06:47 AM   #432
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Boards showed up today Peter, beautiful, I'm glad I ordered another set. Thank you very much for the extra rectifier boards, they are very much appreciated!
I was going to build an F5 P2P, but these will add a very elegant touch.

Have all my parts except for heatsinks and N-channel MOSFETS.

This will be my first DIY amp - can't wait to hear this thing.

Thanks again,
Scott

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Old 28th March 2010, 03:59 PM   #433
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I've got my package last week, with an extra : a pair of rectifier bridge ! Thanks, those pcb are tiny and beautifull !
I've found all the parts on digikey, except 2SJ108/74 and 2SK170/370...
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Old 28th March 2010, 04:55 PM   #434
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Androuski, Member Blues has these for sale. I purchased from him last time.

Matched Toshiba FETs For Sale
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Old 28th March 2010, 07:17 PM   #435
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Thanks !
Can you confirm that 2SJ74/108 and 2SK170/370 are the only ones that need to be matched ?
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Old 28th March 2010, 08:26 PM   #436
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Hi Androuski,
According to the designer himself, the JFETS need not be tightly matched, but do need to be in the same grade, preferably 'BL'. Recommended IDSS for the standard circuit is about 8mA. Many members on the board DO match these devices for optimum results.
In other words: match if you can.

Personally, I got lucky and even partly decided to build an F5 because I have had 20 each 2SJ74BL/2SK170BL from ampslab.com just laying around for almost 2 years - all measured and matched.

It's sweet when you have the toughest parts to get in your parts bin!

One last note:
I have been scouring the threads for information on building an F5 with Toshiba 2SK1530/J201 outputs, one mod I have heard is using 6mA IDSS input fets rather than 8mA, any info is much appreciated, although any respondents should probably post on the F5 builders thread....

Scott
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Old 28th March 2010, 09:45 PM   #437
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Thanks,
I'll see what I can get...
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Old 30th March 2010, 07:45 AM   #438
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Hello,
Just a quick post to say thank you Peter, the rest of the boards arrived last Saturday. Very nice PS boards, perfect for an XL-280 as it happens.

Will post as the adventure progresses....
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Old 5th April 2010, 05:23 PM   #439
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Quote:
Originally Posted by Peter Daniel View Post
Of course there were PS boards for this one as well, but during last few months all have been sold out.
Hi, I am in the process of building this board, having already built the cviller versions.

I notice that the power supply PCB does not have provision for R9 and R10 as shown on the schematic found in Nelson Pass' service manual for the F5. If I remember correctly the value is 2.2k 3w.

Are they not required, or added elsewhere?
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Old 5th April 2010, 09:25 PM   #440
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Those resistors are not really necessary, if you want to ad them, they can be solder directly to the pads.
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