Just almost finish PSU prototype, still need upgrade from the picture?Can anyone give simple info about grounding? I m just a bit unsure about grounding

I have just ordered one exact same size as original chassis,plan to extend its height https://au.element14.com/hammond/1444-14103/enclosure-chassis-alum-unfinished/dp/2493435 Thanks for the info anyway

Yes, I have studied P2P quite some times already, looked for samples of pictures & videos everywhere, learned how other people design their works. However I still can't find any suitable chassis yet, beside that, most of the spare parts and component I already have in hand

I had tried to fix many times however still never work, as the components had been taken in & out a lot of times during troubleshooting and cause the PCB trace damaged. The Mills resistor is not burnt, actually is the surface get heat from soldering gun accidentally, all components have been...

Yes, those are Teflon wire and some Enamel copper wire on the op-amp gain resistor. The reason is because most of trace on this board are damaged and seriously broken. I understand shouldn't work this way, just want to get some opinion & advice. I think is time to learn P2P and prototype method

Hi! What do u think about the amp's Spaghetti wire from picture below? Are there any risk of short circuit, dangerous of high heat, burn smoke smell or over current explosion? So far I have never seen anyone will do this way and I guess no one will agree or accept this type of ugly mod as well. LOL

I have just found the both driver tube socket (12at7) has ground short issue, I guess this is the other reason cause the amp not working

Yes those PNP/NPN transistors was upgraded to higher voltage handling 250 volts, model number 15024 & 15025 Those 2 rectifier is brand new same as original model 2W/10 Those 15V, 36V & 100V diodes was upgraded to 5 watts All resistors around PSU have upgraded to DALE wirewound 5W, 7W & 10W The...

Hi guys! I would like to introduce capacitors discharger which is very useful for DIY members, this built is come from my own idea several months ago, it just need multimeter voltage test, connect with a piece of resistor in parallel so to show the caps is fully discharge, 100% accurate and...

HI Maxx, from picture above, can I upgrade those 2 caps 330uF/250V to 1000uF/250V ? Cause I have those big caps size fit perfectly

From PSU, I Have changed Diodes 15V, 36V & 100V from 1 Watts to 5 Watts power handling, both relay are using Diodes1N4007. Both rectifier remain the same 2W/10 & transistors are MJ15024/MJ15025 (All brand new and no problem so far) All the meter nearby red caps are original WIMA MKP10...

PNP NPN, diodes and resistors brand new checked,however this time both meter light on togather, left side reading 30 and right side over maximum, then the right side meter damage when I shut off the amp straight away. After found the problem and fixed for the cause of meter damage, I tried to...

May be u are right about the Diode broken connection, since last time I found one of the 100V/5Watts Diodes which near transistor PNP trace was disconnected, I guess that's the reason to cause one of 120R resistor began smoke and right side uA meter malfunction then damaged. All 3pin in/output...

Now I try other method, use good quality jumper cable as prototype style, there are a lot spaghetti wiring around, this project will finish soon. All the resistors have changed to Dale & Mills, some electrolytic caps replaced with Nichicon audio grade, only power supply caps remain unchanged...

I didn't want to change 6H30p, just want to get some knowledges differential among those tubes

Hi Maxx! It's been a long time, I m still troubleshoot and hard work on my MK8SE. I had completed several times unsoldered, resoldered and cleaned the board, unfortunately till now still fail to turn it on. Left meter light on with "0" reading, Right meter no response at all, of course no sound...

Here is Z7 newly mod, little bit difference from earlier mod: First Picture: The original filter had been moved to behind driver and add soft earphone pad in the middle of the cup (To avoid clipping sound while listen on high volume) Second Picture: Add half driver cup size of curve shape harder...

Well, I have checked all connection, nothing's wrong. When turning on, the left side meter light up follow by right side meter warm up slowly, unfortunately reading '0' and totally silence. From what I have seen, the meter lights are too bright so I turn off the amp immediately to avoid...

ok, now I got it. Will go back and check my amp later. Hopefully will work this time, thanks a lot anyway!

I have same mistake as u mention picture above , can u tell me what went wrong?

Just found one caps problem and replaced, then try to on again, however bad luck still, this time another resistor smoke (Red arrow from picture below), so have to turn off immediately.

Hi there! It's been a long time as I m busy, how are u? Finally I just finished put all the parts inside the board.but no luck as the amp smoke come out from resistor which make me confusing again about what went wrong? When I began to turn it on, left meter light up and everything look fine...

Hi! Massdrop on sale MK6+ & MK8SE https://www.massdrop.com/buy/little-dot-mkvi-mkviii-se-headphone-amp/talk#discussions

Sorry for the late reply as busy on work and study other diy project. About my MK8SE, still wait for some resistors for replacement, I also just found some broken traces inside the PCB board, those damage areas are very tiny and need a magnifying glass to check carefully. Sure will post after...

Yes , I have read that many times already. I have checked all the connection for every component, non issue include rectifier, so I decide keep going to try another method , hard wire most of the component part of this amp, as I know hard wire connection is a big sound improvement. The place I m...