Marshall JVM Bias Drift PCB Surgery скачать в хорошем качестве

Marshall JVM Bias Drift PCB Surgery

A brief video demonstrating how to perform a Marshall JVM 410 PCB modification to deal with unstable bias and PCB conductivity causing blown tubes and high tension fuses. As with many modern PCB-based multi-channel Marshalls, this JVM 410 was blowing the high tension B+ fuse. As recommended by Dr. Tube (https://drtube.com/en/modifications/j...) the power tube grid leads (pin 5) were isolated from the PCB to ensure (-)DC voltage reaches the tubes without any possible leakage from the other tube socket leads. Hack to safely bias this amp using a Molex 3-pin connector is shown, that Molex connector is: https://www.ebay.com/itm/Molex-3-Pin-... Additionally, a filter choke was added (see the link below on how to install). The filter choke helps smooth out the B+ which feeds the preamp tubes and helps reduce a lot of the noise from the OD channels. Also if you like my channel and this video on amps, I suggest subscribing to the following awesome channels: -Uncle Doug:    / @uncledoug   Uncle Doug has tons of other videos, probably the best teacher on Youtube regarding amps -The Guitologist:    / @theguitologist   Brad runs an all-around great channel, loves to work on wonky stuff as well -D-lab:    / @d-labelectronics   Terry is likely the best electronics technician working to repair tube amps on YT Related links: -Safety! Rob's word on capacitor charge: https://robrobinette.com/Tube_Amp_Saf... Rob's site is likely the most comprehensive resource regarding classic Fender amps, and now amps work. -Brad the Guitologist working on a similar Marshall:    • Mother of All Marshall Amp Repair Videos -...   -JVM Choke Install:    • How to add a choke to your Marshall JVM410   -Why install a choke:    • PI filter, Resistor Choke Oscilloscope Demo   -drill bits: https://www.amazon.com/gp/product/B01... -Marshall Bias Drift info http://www.lynx.net/~jc/TSL122.html -Uncle Doug on Biasing: easiest way to really understand how biasing works    • Biasing Single-Ended Amplifier Output Tube...      • Biasing Double-Ended Amplifier Output Tube...      • Biasing Double-Ended Amplifier Output Tube...