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Old 22nd July 2013, 03:37 PM   #2141
WalterW is offline WalterW  Netherlands
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Quote:
Originally Posted by nashbap View Post
So it looks like the rectifiers are in a tray under the two transformers. Right?

What was your reasoning behind using 25V secondary output transformers and not higher, maybe around 34V?

Where did you buy the Toshiba Mosfets and the Jfets from? I read a post from Tea-Bag mentioning "The FQP variants (FQP19N20C and FQP12P20) are still available via distribution" Did you consider them?

That's a tremendous amount of fantastic machine work you have done!
Thanks nashbap, no machine work just a little Bosch hand drill
Yes, the rectifiers are under the transformers.

The 25 volts give about 32 Volts DC rails which is enough for me, around 100 Watts max. in my 4 Ohm speakers. With my 5 Amp bias around 50 Watts in class A.

No I didn't consider those MOSFETs, I bought the Toshiba MOSFET's rather cheap from NicMac, perfectly matched.
EUVL did also recommend those Toshibas, and I highly respects his work and opinion. Even Pa mentioned the 2SK1530's and 2SJ201's in his F5Turbo article.
JFETs are from Spencer...

Walter
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Old 22nd July 2013, 04:13 PM   #2142
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Default nearly finished time for a redesign

today i finally had the time to start on my aleph 5 mono block's again.
and YESSSS they are allive and kicking
both of them on the first try, no hiss, no hum, no heat.

but alas, i can not measure on the pcb so i have to do a Little redesign so that the pcb can lay on it's back.

the sound is realy great, even playing unbalanced without a real preamp.
source direct with only a ALPS BB soldered in the interlink.

thank you dear Nelson for your great design.
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Old 22nd July 2013, 04:53 PM   #2143
bcmbob is offline bcmbob  United States
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Quote:
Originally Posted by WalterW View Post
They are heat shrink tube, they hide the melted, pulled back isolation when you are soldering thick wires I like to work with shrink tube, gives a nice professional look.
I thought soldering will be the best, where high peak currents could be expected...

Walter
Thanks, I also like the HS for neatness and safety, but I had considered some posts for flexibility and ease of use during assembly/adjustments. I like the way you did the insulated faston double pads from the PS. Hadn't seen that before. You really have a showcase build there.
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Old 23rd July 2013, 09:28 AM   #2144
AndrewT is offline AndrewT  Scotland
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What are grey, yellow, blue and red?
They look like solid core to me.
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Old 23rd July 2013, 04:25 PM   #2145
Itsmee is offline Itsmee  England
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Quote:
Originally Posted by AndrewT View Post
What are grey, yellow, blue and red?
They look like solid core to me.
Usualy those are the standard colours for a transformers secondary windings.
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Old 23rd July 2013, 05:19 PM   #2146
WalterW is offline WalterW  Netherlands
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Quote:
Originally Posted by Itsmee View Post
Usualy those are the standard colours for a transformers secondary windings.
Correct that are the two transformers secondary windings, and they are solid.
Nothing you can do about that, it's how Amplimo produces them.

Walter
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Old 23rd July 2013, 06:03 PM   #2147
AndrewT is offline AndrewT  Scotland
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Quote:
Change the leadouts to flexible
Solid core are susceptible to fatigue.
If you mount the transformer flexibly as you have proposed, then fatigue resistant leadouts will be more reliable.
Change them to flexible leadouts, if you want to flexibly mount your transformer.
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Old 25th July 2013, 02:35 PM   #2148
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While I agree with AndrewT that flexible leads are required when one part can move relative to the other, it does not appear that Walter ended up with any significant flexibility in his build. If I read him correctly, he would have liked to mount the transformer subassembly with flexible mounts, but he did not. I believe the only flexibility in his mount is the standard ~1mm firm elastomer washers that are included with most toroidal power transformers. When the mounting bolt is tightened firmly I suspect that any motion is limited to hundredths of a mm at most. IMHO this will not seriously impact lead reliability.

That said, I have noticed that more expensive toroids tend to have flexible lead outs. Hmm. It might remove a reliability question and it wouldn't be too hard to trim the solid leads fairly close to the transformer and solder flexible leads to the rectifiers. It would also allow another opportunity to use heat shrink tubing.

Last edited by BobEllis; 25th July 2013 at 02:38 PM.
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Old 25th July 2013, 03:22 PM   #2149
WalterW is offline WalterW  Netherlands
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Quote:
Originally Posted by BobEllis View Post
While I agree with AndrewT that flexible leads are required when one part can move relative to the other, it does not appear that Walter ended up with any significant flexibility in his build. If I read him correctly, he would have liked to mount the transformer subassembly with flexible mounts, but he did not. I believe the only flexibility in his mount is the standard ~1mm firm elastomer washers that are included with most toroidal power transformers. When the mounting bolt is tightened firmly I suspect that any motion is limited to hundredths of a mm at most. IMHO this will not seriously impact lead reliability.
Exactly! And they are tightened firmly!

What I ment with flexible is that I can disassemble the whole amp without having to cut wires from PCB to PCB. So I solved this with the double Faston connectors. I can also take the whole subchassis, with trafos and rectifiers, out of the case. I never intended to get my trafos separate out, or mount only them flexible.
If I would do so it will be the whole subchassis in flexible rubbers.... but I didn't...

Walter
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Old 25th July 2013, 03:50 PM   #2150
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Quote:
Originally Posted by BobEllis View Post
use heat shrink tubing.
BOBBY

You of all folks should know how much vibration several thousands of diesel kW's, at say 2100rpm, can facilitate.

Example of a 60 KW/ton (shaft power/displacement), 45kn top speed screamer from the early '90s.
Structural damage level from excitation forces, led to a few hundred thousand dollars costs in testing & engine room modification.
Plenty of solid copper in those locations, at acceptable vibration levels, easily survive the W6 stretch.

Flexible leads is more of a convenience issue.
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