WOPL 700B Rebuild Left Channel Buzz

[Hexis22]

Depending on how you turn the amp on/off, you may want to consider a Triac power switch from Don or wattsabundant.

The inrush current when turning these amps on can be quite high and eventually weld the contacts of the original switch.

See any of my past 700 builds for examples, it’s placed between the backplane boards.

 

[J!m]

If you want a quiet amp, wire dress matters. Ask Mark, Perry, Eric, Glen, Lee, George, Gene, Matt, who did I leave out You can get over 108dB SNR if you are very careful with wire routing.

You left me out...

 

[Gepetto]

You left me out...

Fixed

 

[Vintage 700b]

You left me out...

I am very careful with routing and wire dressing as well.....transformer isolation.....

 

[J!m]

Sort of like running a finely tuned race engine on cheap fuel...

 

[jskylab]

Your totally right! Sometimes I get in a rush and just try to get it done but definitely worth taking the extra time for lead dressing on these. I'm going to use the original power switch for now but I'll definitely order a Triac switch from Don, along with the other WO assemblies. Just have to hook up the front panel today, with the meter drive coming off the DCP, keeping the AC bundled together for the switch and LED board on the far left, and leaving the ground wire somewhere in the middle. Let ya'll know how it comes out in the end. Thanks again......you've all been so helpful!!

Jeff

 

[J!m]

If you keep the original switch, use both sets of contacts to half the amperage each set sees. (and clean it well while you're there)