Hi,
i have a beard P100 MKII amplifier to control, i do not know this amplifier, to work on the pcb is necessary to unsolder the most connections?
i have a beard P100 MKII amplifier to control, i do not know this amplifier, to work on the pcb is necessary to unsolder the most connections?
Yes, i think so, i have the same amplifier to recap, and it is a hard work to take that board in order to replace the caps, and i did not started yet to do so. What is the problem in your amplifier ?
In my amplifier, one channel occasional small discharges, i suspect the balance bias trimmer, also there are some capacitors to replace.
I have had the Beard P100 for 20 years now and have done extensive upgrade work on it. The potential of this amplifier is tremendous and with some work and upgrades it can perform up there with the best.
To your point, to work on the PCB you best approach is to disconnect the power supplies from the PCB:
1. Two HV supplies one at each side of the front of the PCB. These are the ones with multiple connection pins on the PCB. Make sure you mark them well so that you know how to solder them back into place.
2. Two bias power supplies and two HV supplies (two on each side of the PCB) one is Green/Yellow and one Pink/White wires. you need to pull them out through the hole in the PBC.
Now you can lift up the PCB from the front and work on it. This way you avoid disconnecting all the wires at the front of the PCB.
Hopefully this helps.
To your point, to work on the PCB you best approach is to disconnect the power supplies from the PCB:
1. Two HV supplies one at each side of the front of the PCB. These are the ones with multiple connection pins on the PCB. Make sure you mark them well so that you know how to solder them back into place.
2. Two bias power supplies and two HV supplies (two on each side of the PCB) one is Green/Yellow and one Pink/White wires. you need to pull them out through the hole in the PBC.
Now you can lift up the PCB from the front and work on it. This way you avoid disconnecting all the wires at the front of the PCB.
Hopefully this helps.
I also forgot to mention that the thing that's probably causing noise is the tube sockets themselves. I ended up replacing all the small signal tube sockets and the amplifier is dead silent after that. It is a lot of work though. I also replaced all the bias trimmers and the channel balance trimmers with precession trimmers.
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