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Old 20th October 2018, 07:39 AM   #6361
MEPER is offline MEPER  Denmark
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Join Date: Nov 2017
Location: Copenhagen
Quote:
Originally Posted by Neel007 View Post
This is the wiring in the box:
Attachment 710169

The soldering work looks bad.
A couple of wires looks like they are not soldered at all.
A black wire from the switch and also the resistor from the switch.
You should let the solder flow so the hole is all filled with solder. All solder joints should be nice round and shinny (no sharp edges). Many looks like "cold" solder joints like you use too little temperature. If you use lead free solder this has higher melting point and is more difficult to work with. Use 60/40 solder......
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Old Today, 08:03 AM   #6362
Neel007 is offline Neel007  Netherlands
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Quote:
Originally Posted by Neel007 View Post
Thank you Alan, i used the exact components, except for two resistors. I substituted R10 for a 330k and R12 for 39k, since the 332k and 39k2 I could not find easily.
Hi Alan,

i was notified by another DIYAudio member that my Q1-Q4 semiconductors most likely are counterfeits...
So I guess that could be a viable explanation... Do you know of easy to find substitutes for the (hard to find) parts?
Did you find any other possible irregularities (like an error in the PCB or something else)?

Thank you,
Neel
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Old Today, 08:51 AM   #6363
plsvn is offline plsvn  Italy
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Join Date: May 2018
Quote:
Originally Posted by oc11 View Post
My post 6325 gave the wrong name for the company with the fancy 4 stage professional attenuators. It is Goldpoint. They are not cheap.
Luminous Audio too makes very good passives. Not cheap either but you get some options
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Old Today, 08:58 AM   #6364
MEPER is offline MEPER  Denmark
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Join Date: Nov 2017
Location: Copenhagen
I have good experience with Goldpoint. I just used their 24 step attenuator using 0.5% smd thin-film resistors and built it into a box. 24 step is fine.....no really need for 47 step.
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Old Today, 09:28 AM   #6365
Alan4411 is online now Alan4411  Wales
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Join Date: Oct 2011
Location: West Wales
Quote:
Originally Posted by Neel007 View Post
Hi Alan,

i was notified by another DIYAudio member that my Q1-Q4 semiconductors most likely are counterfeits...
So I guess that could be a viable explanation... Do you know of easy to find substitutes for the (hard to find) parts?
Did you find any other possible irregularities (like an error in the PCB or something else)?

Thank you,
Neel
First, no I cannot see any obvious mistakes in the PCB.

Radio Spares and Farnell (element14) do the ZTX450 and IRFP240s, I'm sure there must be other reputable Dutch suppliers too. These are not hard to find genuine parts.

The 2SK170 jfet is a bit of a lottery though.
First there are / were only 2 makers: Toshiba = 2SK170 and Linear Systems = LSK170.
Then they come in 3 (or 4) different 'flavours' depending on the IDSS.
You want an IDSS of more than 6mA so try for 2SK170 BL (or LSK170 B). You may find 2SK170 V (or LSK170 C) and these will work fine too. Google and ebay I guess and Not from China!

I'm still worried by your 0.47 and 0.68 ohm resistors though. If you cannot measure them, I would replace them with different ones Without the leading Black band.
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