View Single Post
Old 19th Oct 2020, 7:28 pm   #6
MeanDumpsterCat
Pentode
 
MeanDumpsterCat's Avatar
 
Join Date: Oct 2014
Location: Selsey, West Sussex, UK.
Posts: 204
Default Re: Ferrograph Quiet Crackly Audio

Okay so I had a look at the power supply.

I noticed that one of the wires of the ECC82 is damaged though it seemed to check out okay with the multimeter.

I also cleaned the valve sockets with de-oxit without much luck.

Its also worth noting that the amp did take a bit of a knock on the workbench by accident however I couldnt see anything that's damaged.

Would it be possible that the damaged connection would be okay on the 4V from my multimeter but cause issues when at higher voltages.

According to the pinout, the break is on the second grid of the ECC82

I am still thinking the fault resides in the amplifier though. I'm just not sure if a poor connection on the ECC82 oscillator would cause lack of volume an no erase. Please correct me if i'm wrong.
Attached Thumbnails
Click image for larger version

Name:	2020-10-19 19.21.19.jpg
Views:	73
Size:	78.9 KB
ID:	218363   Click image for larger version

Name:	2020-10-19 19.21.55.jpg
Views:	72
Size:	74.9 KB
ID:	218364   Click image for larger version

Name:	Screenshot 2020-10-19 at 19.26.38.jpg
Views:	59
Size:	55.3 KB
ID:	218365  
MeanDumpsterCat is offline