WOPL 700B Has more output on the left channel.

[laatsch55]

380 to 385

 

[Mohawk]

Ok....

What is the reason or rationale for that setting .... Considering the" norn" seems to be .350 What's the benefit set high or set low ?

M

 

[laatsch55]

The norm is 385. The higher the lower the distortion, alongvwith running warm..

 

[Mohawk]

.385 it is .... Thank you !

 

[Gepetto]

You can see from this data at 0.25W (kind of a worst case for a PL700) that it does not matter a whole lot after you hit 0.350V

 

[Mohawk]

Your expert opinion on setting the bias ? Stay near .350 or .380 as "latch" suggested ?

M

 

[Gepetto]

Your expert opinion on setting the bias ? Stay near .350 or .380 as "latch" suggested ?

M

Both work fine...see attached. You have the data on the effects.

I don't recommend going over the 0.380 number because cross conduction can set in (very bad) above that when things heat up.

 

[Mohawk]

Back up and running.... The channel volume issue is gone... ( Don't know where it went ! ) When I first connected it to the test speakers on the bench I thought it had failed in some way.... NO perceivable hiss or hum from the speakers !

1) cleaned all the solder flux
2) rewired the AC across the middle , below the thermal switches
3) insulated the transformer from the case & insulated the bolts
4) Peters's "faraday cage"