NEVER TEST AMPLIFIER WITHOUT SPEAKERS ATTACHED…IT WILL BLOW YOUR OUTPUT TRANSFORMERS!!!
https://www.cgs.synth.net/tube.html
https://www.cgs.synth.net/tube/vco.htm
www.schmitzbits.de/vtvco.html
The Yaqin MC-100B has now blown valve 3 twice.
Each time the amp was running in Triode Mode, until we find out what is wrong, only use in Ultra Linear Mode!!!
To Repair the Amplifier
Remove power lead.
Switch on amp to drain down caps.
Remove all valves making sure to note the original location of each valve.
Turn amp over and remove all outer edge screws.
Remove all inner screw and the two central rubber feet.
Check if PCB has a micro crack from heat.
http://www.geofex.com/ampdbug/coupling.htm
http://www.g4cnh.com/public/A_LOOK_AT_THE_YAQIN_MC100B.pdf
https://www.audioasylum.com/cgi/vt.mpl?f=tubes&m=238017
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