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Old 14th January 2015, 05:35 PM   #2321
vdi_nenna is offline vdi_nenna  United States
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DIY progress report
Picked up 4 pairs of SK and SJ in case the next version doesn't use 1001 power supplies.
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Old 30th January 2015, 11:35 AM   #2322
flg is offline flg  United States
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The Latest from First Watt...
FIRST WATT WATT'S NEW
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Old 3rd November 2015, 09:47 AM   #2323
Suzukidriver is offline Suzukidriver  Germany
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Default Pass X2.2

Hello and good day, this is my first post in the forum.
I have purchased a X2.2 recently. The preamplifier should be complete according to the seller. When I received the goods missing on 2 of the modules respectively 2SK389BL and 2SK109BL. As a substitute I matched 2SK170BL and 2SJ74BL used. Can anyone give a guide how to measure and adjust the bias current on the modules?
Many thanks in advance
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Old 3rd November 2015, 10:35 AM   #2324
Zen Mod is offline Zen Mod  Serbia
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clone ?

maybe Wayne will chime in ......... maybe not
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Old 17th March 2017, 07:27 PM   #2325
Juntuin is offline Juntuin  Finland
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Hello diy community! I was not quite sure where to write, so let it be this topic now I got my hands on couple of pcb:s that claim to be Aleph 5 clone, little bit of google and those are probably kk-pcb Aleph 5 - clone boards. So, im building my first amplifier (monoblock pair) based on these. Now i wish i had chosen a bit easier project at first!

I have two 2 x 30v 545VA toroids, CRC and 176 000uF capacitance, so far only part that is ready is psu..and my question is about that. I tried to measure psu voltage after capacitors, without dummy load, or load at all. Results confuse me, voltage raised to 38v or so, then it start slowly to climb down. Is this normal, is it possible to measure whole psu without load?

Sorry my english..

Thanks!
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Old 17th March 2017, 09:48 PM   #2326
Zen Mod is offline Zen Mod  Serbia
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pictures please
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Old 17th March 2017, 11:30 PM   #2327
Juntuin is offline Juntuin  Finland
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Quote:
Originally Posted by Zen Mod View Post
pictures please
Here is couple before soldering. What is missing from pictures are 25w 0.1ohm resistors where wires are cut in the middle. 2,2kohm 5w bleeder resistors and 4,7uf capacitors for filtering also added before test.

But pictures wont solve my questions, how voltage should act when powering psu up without any load? Stable from the beginning? I kept those powered up only a short while. First start was of course with light bulb current limiter without problems. Did not dare to keep power on for longer while, got worried about voltage readings
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Old 18th March 2017, 02:25 AM   #2328
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by Juntuin View Post
.........

But pictures wont solve my questions, ..........
how I'm going to help you , then ?
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Old 18th March 2017, 09:14 AM   #2329
AndrewT is offline AndrewT  Scotland
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The Mains Bulb Tester will protect your transformer from damage if you have a wiring fault. For this early stage of wiring/testing use a 25W, or 40W bulb.

Have you measured the input and output at the transformer without any PSU connected?
Post results.

Then add the bridge rectifier. Post results.
Then add one pair of smoothing caps. Post results.
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Old 18th March 2017, 09:28 AM   #2330
Juntuin is offline Juntuin  Finland
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Quote:
Originally Posted by AndrewT View Post
The Mains Bulb Tester will protect your transformer from damage if you have a wiring fault. For this early stage of wiring/testing use a 25W, or 40W bulb.

Have you measured the input and output at the transformer without any PSU connected?
Post results.

Then add the bridge rectifier. Post results.
Then add one pair of smoothing caps. Post results.
Should i measure with bulb tester, or without it, does it matter? With bulb tester everything seems ok, i used 40w and 75w bulbs. I have fired it up already with normal power cord also.

I havent measured part by part yet, i will do it and post results when ready thanks for helping me out!
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