Thanks bobine ...The cracks are not triggered by sound..... they seem totally random, they can start at any time I have had hours of silence, hours of silence with one or two cracks, Ive hours of cracking & nothing else....
The noises can be fairly quiet but more so really violent & often in sustained attacks as if dragging the HT lead all over the circuit sounds terrible.
I had a tech friend check over the mic & solder joints & also the power supply he found nothing wrong I suggested it could be a capacitor......I have already replaced the 3 capacitors, the small first died....the paper oils smell strange & seems to ooze a little oil I guess... also was getting warm.....I thought this was my problem but no....I replaced the other 1 uf anyway
The power supply I made I can produce 120V via switch I use it to power AKG C28A & a SP TB1(C12 ish) I made from scratch.....
The MK47 is in a large metal can for now not a real mic casing I have a violet vin 67 lollypop fitted I have also tried a lomo lollypop a Oktava MK101 head, ADK Vienna head & a RK47 capsule with solid tube grill......I have other expimental mics made this way SP Tb1, Ela M250, sony C37A, G7 havent had a single crackle from any of them.....
Sadly its gettiing messy where i have swapped components so many times now ......my best spell of silence came after spraying switch cleaner over board & components & cleaning with cotton bud......but this even could be coincedence ....the pops came back I clean again & so on....
I had to leave the thing alone for now as I will break it the next time it cracks.. Iv took the lolly off it and disconnected it from the PSU as it was hard wired.....If i get inspiration and patience I might have another go.......I might just take it completly apart and re assemble point to point like my other mics....next time I order from farnell I will order knew resistors......
last night I made a very quick royer circuit point to point worked first go no pops & crackles