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Old 7th February 2013, 02:22 PM   #1591
Marra is offline Marra  United Kingdom
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Thanks Walter unfortunately neither RS or Farnell have anything like those on there sites.
Really nice build by the way.
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Old 7th February 2013, 02:27 PM   #1592
Bonsai is offline Bonsai  Taiwan
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Quote:
Originally Posted by WalterW View Post
And some more pic's of the finished F5......

The last foto is my next project: the F5 Turbo v2 with bigger Austerlitz KS300.6 heatsinks, 2sj201 / 2sk1530's and I want to do the EUVL trick with the extra 5 Ohms resistor in the 2SJ74's source. Also truing to build the chassis myself with the heatsinks I have. So again a lot of work to come...

Thanks again for all your knowledge
Wow, that is a great build! Congrats

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Old 7th February 2013, 02:41 PM   #1593
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Quote:
Originally Posted by WalterW View Post
dickbest
Dick is a fun guy.
In the early days of his shop, he told me I offered way too much for his parts, so he charged me half.

(excellent looking project, nice to see the babies nested, and so quick)
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Old 7th February 2013, 02:46 PM   #1594
bcmbob is offline bcmbob  United States
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Originally Posted by WalterW View Post
Hi Bob,

...........
But I'm planning on building new speakers myself, .............

Cheers, Walter
Since you are going to build, let me suggest you take a look at the "Sunflowers". They are premium output devices at a very reasonable cost. I've built around fifteen different designs over thirty years and I most likely will stop with these.
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Old 7th February 2013, 03:13 PM   #1595
WalterW is offline WalterW  Netherlands
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You're correct AudioSan! 3U300 with alu backplate and 10mm frontplate... Just enough cooling for a F5.
Heatsinks get around 48 degrees Celsius at 1.3 Ampere bias.
I tried to bias them at 1.75 Ampere each, but that was too much for the heatsinks...
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Old 9th February 2013, 10:37 PM   #1596
WalterW is offline WalterW  Netherlands
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Thanks Bob, done some reading, I like the Sunflowers... but they are way to big for my livingroom, the WAF is too low
I need some small high quality speakers...
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Old 10th February 2013, 10:10 AM   #1597
bcmbob is offline bcmbob  United States
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I had the same problem several years ago, so I traded my WAF in for a pair of Kliscphorns. Seems to have worked out just fine.

Wont go off topic any more after this, but the Overnight Sensation have a great reputation. Same designer.
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Last edited by bcmbob; 10th February 2013 at 10:19 AM.
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Old 15th February 2013, 06:47 AM   #1598
omishra is offline omishra  India
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Default Pass F5 turbo build

I built this Pass F5 turbo V2 for a friend, biased 0.55A/device on 33V rail. Caps are 4 X 15000µF /rail making total 120,000µF/channel . Toroidal trafo 4 X 24-0 secondaries for transformer making total 1KVA and PCB designed by me for 15 people in Indian forum GB.
Aluminum box is handmade using hacksaw, power drill and set of files; except anodizing.

image913h.jpg image918r.jpg image919s.jpg

More coming in F5 Turbo builder's thread.
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Old 15th February 2013, 06:52 AM   #1599
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Originally Posted by omishra View Post
I built this Pass F5 turbo V2 for a friend, biased 0.55A/device on 33V rail. Caps are 4 X 15000µF /rail making total 120,000µF/channel . Toroidal trafo 4 X 24-0 secondaries for transformer making total 1KVA and PCB designed by me for 15 people in Indian forum GB.
Aluminum box is handmade using hacksaw, power drill and set of files; except anodizing.

Attachment 330517 Attachment 330518 Attachment 330519

More coming in F5 Turbo builder's thread.
Is the mains transformer located underneath the large capacitors' PCB?
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Old 15th February 2013, 07:23 AM   #1600
omishra is offline omishra  India
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Is the mains transformer located underneath the large capacitors' PCB?
Yes, those power filter PCBs are elevated above transformer. There is 3/4" gap between transformer and PCBs.
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