OK, so my third project is almost complete. I have built a P88 preamp with boards supplied by Mr. Elliot. I have had the preamp in services with the recently completed Leach amp and the sound is awesome. Of course I wouldn’t be posting if there wasn’t one small problem. I built the amp with the balance and volume control as per the P88 instructions. (see attached)
The problem is the balance control only affects the left channel. Turning the pot full right results in signal to only the right channel. However, there is no effect on the right channel so turning the pot anywhere left of centre results in a balanced signal between the two channels. I have rewired the volume and balance pot three times making sure all connections are done as outlined above.
Does anyone have an idea of what could be causing this problem. The pots are a single 10K for balance and a dual 100K for volume linear pots as outlined in the diagram.
Any ideas or comments would be appreciated.
Thanks,
Curioprop
The problem is the balance control only affects the left channel. Turning the pot full right results in signal to only the right channel. However, there is no effect on the right channel so turning the pot anywhere left of centre results in a balanced signal between the two channels. I have rewired the volume and balance pot three times making sure all connections are done as outlined above.
Does anyone have an idea of what could be causing this problem. The pots are a single 10K for balance and a dual 100K for volume linear pots as outlined in the diagram.
Any ideas or comments would be appreciated.
Thanks,
Curioprop
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