George Wright WPL-20

[robertod]

Picking up hookup wire tomorrow.  This will allow me to finish the hum pot.  The caps have beeen upgraded.  The two new resistors have to be installed.  If I install the two resistors should the resistor you mentioned in the above post, need to be grounded?  And how do you ground the resistor?

 

[Paul Birkeland]

If you are going to replace any resistors, you pull the one out you'd like to replace, then put the new one in exactly where the old one was (connected to the same terminals).

 

[robertod]

Ok gotcha, I do not have to ground the the resistor you mentioned earlier.
Thanks.

 

[Paul Birkeland]

Ok gotcha, I do not have to ground the the resistor you mentioned earlier.
Thanks.

The resistor I mentioned earlier would go between the grid of the output tube and ground.

 

[robertod]

Could you send pic how it should be done.
Thanks

 

[Paul Birkeland]

You have multiple photos of that resistor.  It is where it is, either you leave the one there that came with the amp or you pull it out and put a different one in there.

 

[robertod]

ok, thanks.

Completed one amp, after re-soldering a few connections and adjusting hum pot can't hear the hum from listening chair.  Will work on second amp after I get a few things done at work.  Will update status soon.

Thanks,
PB

 

[robertod]

PB,
Upgrade/mods. on the Wright Sound 3.5, 2A3's complete.  The hum is gone, can't hear it from listening chair. The music, I can hear the difference and I know only with time (100hrs) the caps will break in and even sound better.
Thanks PB for all your help.
Roberto

 

[Paul Birkeland]

I'm glad you got it all sorted out and the hum is gone.

 

[seattlemagpies]

Hi There,

I just picked up a WPL20 but it's missing its external power supply.  I'm looking for specs, circuit diagram, etc, anything that can help me build another one.

I found a website that allegedly has the circuit diagram (contact for access), but appears to be defunct.  (audiocircuit . com)


So, I thought I'd ask here.  I can't image the layout for the PS is that complex, maybe just some detailed pics of the circuit and components might allow a deduction of the design.

Any help greatly appreciated

 

[Paul Birkeland]

You'd be best off buying another WPL-20 and cloning its power supply for yours.

 

[seattlemagpies]

I'd be open to that, if it was even possible to find one...

 

[robertod]

sent you pm