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ExtraThiccBoi

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About ExtraThiccBoi

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    Void of darkness
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    Czech Republic

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  1. ExtraThiccBoi

    Are these caps genuine? (Nichicon UFW)

    Okay, this is unrelated to capacitors,but i dont wanna start a new thread. On the main amplifier board, there are 4 pairs of TO-92L BJTs. The PCB is lightly discolored under them and before i took the amp apart, i noticed they run at like 65-70°C. I think they are the pre-amplifier transistors. Do you think they run hot because i feed the amp too high signal? The CD input sensitivity is 0.150V, but all of my gear outputs atleast 1Vrms. Is that anything harmful? I dont wanna lower the digital volume since it screws up with quality.
  2. ExtraThiccBoi

    Are these caps genuine? (Nichicon UFW)

    I have cleaned many, many things with IPA and ethanol. Both are basically harmless to 80% of plastics. By the way, this white gunk is the rosin dissolved in isopropyl alcohol. I have cleaned the main PCB of the amp with IPA and had none of these nasty residues. Isopropyl is the only strong solvent i know of that doesnt directly damage or dissolve plastics.
  3. ExtraThiccBoi

    Are these caps genuine? (Nichicon UFW)

    I've been told the rosin can absorb moisture over time and create a high-resistance path.
  4. ExtraThiccBoi

    Are these caps genuine? (Nichicon UFW)

    What do i use to clean off the flux then? Some people use acetone, thats too aggressive and could legitimately damage these old PCBs. Isopropyl is more gentle but still very effective
  5. ExtraThiccBoi

    Are these caps genuine? (Nichicon UFW)

    I check every joint i make or fix with mm continuity, all of these are fine. I am concerned if i didnt use too much solder. This is what happens when i clean the board with isopropyl. It dissolves some goo the pcb had from the factory and makes this nasty mess
  6. ExtraThiccBoi

    Are these caps genuine? (Nichicon UFW)

    You're right. I'll put in the panasonics/the ones which measure better. Also, i don't have much experience with pcb soldering, are these joints adequate?
  7. ExtraThiccBoi

    Are these caps genuine? (Nichicon UFW)

    Ill try them and if i decide they're bad ill take them out
  8. ExtraThiccBoi

    Are these caps genuine? (Nichicon UFW)

    So i got the measurement thingy, the nichicon 100uF 25V throws 94uF and 0.79ohm ESR. The panasonic 100uF 25V i got as backup measures 102uF and 0.04ohm ESR. Which one should i put in? The audio grade or the lower ESR one?
  9. ExtraThiccBoi

    Are these caps genuine? (Nichicon UFW)

    Yeah, well, the shipping from US suppliers to EU is expensive. The cap should be gold, this is just black and white image, even if you check the UFG on mouser, it has black and white image too.
  10. ExtraThiccBoi

    Are these caps genuine? (Nichicon UFW)

    So yeah, i ordered one of those Mega328 based testers so i can test the caps and all the transistors. The amp better be restored properly than blow up after few months because of my stewpidity.
  11. ExtraThiccBoi

    Are these caps genuine? (Nichicon UFW)

    Unfortunately no, but i know the CEO of the supplier i got them from i can ask there.
  12. ExtraThiccBoi

    Are these caps genuine? (Nichicon UFW)

    In some european countries, especially the less developed ones, loads of NOS vintage semiconductors can be found. I managed to find the output transistors NOS from Germany and in Croatia, there is a guy who sells those NOS too, he even smashed some of them open to prove they're genuine. The thing is that from mouser, i'd pay 15 USD for the parts, 30USD for shipping and then additional taxes and import fees. I bought the rest from big german supplier so i am sure those are all genuine.
  13. ExtraThiccBoi

    Are these caps genuine? (Nichicon UFW)

    I checked both of those using the number provided and both match the cap's size, markings and the specs. I'll try to contact nichicon, thanks for that tip These are not fine gold, these are the lower ones (UFG -> UFW). They also were not cheap, i paid (in US $) around 0.2 for the bigger ones and 0.15 for the smaller ones. https://www.digikey.com/product-detail/en/nichicon/UFW1E101MED/493-15125-ND/1964118 This is the official digikey site.
  14. Hi, i am new here and i found many interesting topics here regarding genuinity of capacitors. I recently purchased these from a local supplier, just for shits and giggles to see if they any good. Measured the size (+-0.5mm), compared with pics online and took under magnifying glass to find any imperfections. Seems like they're genuine. The retailer's number matched the number of equivalent part on mouser and digikey. I am currently in the process of restoring HK6500 and i am planning to use these in the audio circuits (main amp filtering and phono preamp). This is my first restoration, i'd appreciate help from someone more experienced if someone would be willing to help me Best regards and greetings to down under
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