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Old 9th July 2013, 11:17 PM   #2271
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Holy sh^t. Andrew agreed with me. Beulah land, here I come.
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Old 10th July 2013, 06:37 PM   #2272
AndrewT is offline AndrewT  Scotland
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If any one posts the truth, then surely it follows that at least one other Member will agree.
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Old 17th July 2013, 09:18 PM   #2273
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Quote:
Originally Posted by WalterW View Post
Making some progress...
I thought posting some pictures will be nice.
I'm rebuilding my F5Tv2 to a v3.
One channel is done, think I test it first, before buiding the next channel. Curious if it will be stable with the larger output stage.
I'll test it today, hope I don't destroy it

Made some improvements too.
-Used Kerafol 86/82 red for the outputs and diodes. On the first pic you can see it's rather fragile, can't be used twice. I mounted the outputs for a test with M4 bolds with washer, as tight as possible, and it gives too much pressure in the area of the M4 so it destroys the Kerafol.
So I decided to make a clamping bar of 4 mm steel just for the outputs. See pictures.
Hope the thermal coupling gets better. Will post the results.

- Coupled the Jfets with some copper and thermal glue.
- I glued the new (better) thermistors to the outputs. I have good experience with that, with my standard F5.
- Replaced the 10 Ohm JFet source resistors for Dale CMF55's.
- made the connection to the PSU with faston connectors, so it's easier to disassemble.
- Upgraded the outputs source resistors to 10 Watt with two paralled MPC74 0.47 Ohm resistors. Looks nicer when the whole PCB is filled with components...
- upgraded some cabling with thicker 6mm cable. And for the input no more fragile coax, but twisted signalwire. Like Pa does...

Oh, and I build a DC-filter ( schematic of Rod Elliot) for the mains, see picture, and now all mechanical hum of the big toroids is gone !


Walter, your work looks brilliant. Love the way you have placed the caps in close proximity to the amp board. Any further progress? What boards are you using for the amp and the caps? What transformer output voltage? Why the two paralled 0.47 ohm resistors instead of the 1ohm suggested? Thanks.
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Old 18th July 2013, 07:17 PM   #2274
WalterW is online now WalterW  Netherlands
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Quote:
Originally Posted by nashbap View Post
Walter, your work looks brilliant. Love the way you have placed the caps in close proximity to the amp board. Any further progress? What boards are you using for the amp and the caps? What transformer output voltage? Why the two paralled 0.47 ohm resistors instead of the 1ohm suggested? Thanks.
Thanks nashbap,

I posted the last pictures of my finished f5T v3 here:
Pictures of your diy Pass amplifier


I used the Teabag PSU and AMP boards, he is a member on this forum. So easy to find.
Transformers are 2 x Amplimo 2x25V 2 x 12,5 Ampere. I'm using matched Toshiba 2sk1530 / 2sj201 for output devices and those devices need around 0,22 Ohm for source-resistors. So 2x 0,47 Ohm paralleled.

Walter
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Old 18th July 2013, 07:28 PM   #2275
WalterW is online now WalterW  Netherlands
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[QUOTE=nashbap;3565015]Walter, Any further progress? QUOTE]

Haha, bit OT but making progress with this:

drivers: Vifa NE123, Vifa NE265 and Scanspeak Illuminator D3004/66200
Attached Images
File Type: jpg Vifa Vivace 2012.jpg (248.1 KB, 501 views)
File Type: jpg Vivace 2x.jpg (256.7 KB, 490 views)
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Old 20th July 2013, 10:52 AM   #2276
AndrewT is offline AndrewT  Scotland
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Spectacle style bracing give a lot more glue area than X style.
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Old 20th July 2013, 11:30 AM   #2277
WalterW is online now WalterW  Netherlands
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Hi Andrew, my English isn't that good... what do you mean with 'spectacle style bracing'?
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Old 21st July 2013, 07:47 AM   #2278
AndrewT is offline AndrewT  Scotland
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A plate across the whole cross-section of the box with two big holes cut out of it to look like spectacles.
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Old 21st July 2013, 03:01 PM   #2279
henryve is offline henryve  South Africa
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Figure 8 braces.
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Old 1st August 2013, 07:12 PM   #2280
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Everybody must have gotten parts to build their amps, kind of quite around here lately. Well at least this thread.
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