QUAD 57 panels

[Iamimdoc]

I have a pair of these speakers in excellent condition (externally at least). They have been stored In a closet in my air conditioned house for about 5 years. I plugged one in today. I let it charge for an hour or so. Using QUAD 405 amp. Speaker plays but much bass output. How long would one expect the panels to fully charge so I can determine if they work well or not? Very wet and humid today although speakers in air conditioned house if that makes a difference.

Thanks

 

[stokessd]

I would let them charge up for at least a day before you write off the treble panels. The original coating evaporates over the decades and what used to take minutes to charge now can take a day or more.

Sheldon

 

[Iamimdoc]

Ok

Treble panel seems fine but will try again tomorrow

 

[gnnett]

Ok

Treble panel seems fine but will try again tomorrow

In which case you might want to re-read your original post, where you imply that there is nothing wrong with the bass panels.

Cheers

Grant

 

[Iamimdoc]

My mistake

Sorry, meant much less bass output.

 

[stokessd]

You may want to rebuild your power supplies first. That will guarantee that you have the polarizing voltage you expect. If you are low on bass output it can certainly be the power supply or the panels. A bad power supply will effect the bass panels the most.

Sheldon

 

[Fabien Lefebvre]

If only one speaker is concerned, you can try switching power supplies.
Let unpluged few hours first before opening !

 

[Iamimdoc]

Power supplies

Haven't had time to test everything but how much of an ordeal is changing power supplies?

Are there any straightforward instructions on the internet as to how to do so?

Thanks

 

[stokessd]

you could look at my ancient Quad rebuilding book, it shows pictures of how they go in and out. But basically it's like this:

Remove the rear grille by loosening all the wood screws around the perimeter and lifting it backwards away from the speaker.

Under the speaker remove the four BA4 nut and bolt assemblies holding the power supply tot he base of the frame. The power supply can now slide backward away from the bass panel and off the frame.

Unsolder the three wires from the rectifier block, and your power supply is free.



Sheldon

 

[Iamimdoc]

Wonky Quad

I am using a quad 405 amp to test these speakers

I swapped the output channels and both speakers seem to work fine

Less bass output out of one channel of the amp seems to be the issue

That seems odd to me as usually amps work or don’t. This is just based on my experience and not of an electronics knowledge whatsoever as I have minimal to none.

Any comments appreciated

Thanks

 

[stokessd]

Everything you have there is really old, and could have a variety of problems. I'm no expert in the 405, but I'd suspect it could benefit from a shotgunning of all components that don't age well like the electrolytic caps (maybe ignoring the big filter caps due to cost).


Sheldon