QUAD factory anomalies (ESL 57)

[Nemeske]

I've came across these pictures at ebay. First, I thought that it's some digital bug, but when I took a closer look, I saw that it isn't.
Quad sold units with mis-double-punched panels to buyers?

 

[WrineX]

are you sure they where not fixed by some guy that made a mistake

 

[Nemeske]

are you sure they where not fixed by some guy that made a mistake

How? You mean if the user re-punched the panel?

 

[Konzentr8]

An example of classic British ' Friday afternoon ' engineering possibly

 

[lcsaszar]

Don't look at it, listen to it!

 

[Nemeske]

Don't look at it, listen to it!

You're right, László ;-)

...and I worried about the evenness of the aquadag at the basspanel...

 

[Nemeske]

An example of classic British ' Friday afternoon ' engineering possibly

Looks like it, hahaha

 

[stokessd]

I've seen lots of questionable assembly quality in the original ESL's over my 20+ years of rebuilding those things. Mis-aligned rivets, the pass-through cable that isn't in the central support, but is in the diaphragm space.

I had an EHT block where the diodes weren't soldered in.

not too impressive

Sheldon

 

[Nemeske]

Hahaha. I would gladly see them, if you have any pictures of those 'anomalies'.

I've seen lots of questionable assembly quality in the original ESL's over my 20+ years of rebuilding those things. Mis-aligned rivets, the pass-through cable that isn't in the central support, but is in the diaphragm space.

I had an EHT block where the diodes weren't soldered in.

not too impressive

Sheldon

 

[Konzentr8]

You think the speakers suffer poor quality control ? , you should see some of our cars from that era

 

[Nemeske]

You think the speakers suffer poor quality control ? , you should see some of our cars from that era

You mean Jaguar or Rolls Royce? Anyway, we also had our 'reasonable quality' products and those coming from the eastern neighbours decades ago. Probably, QC wasn't an abundant aspect of production.

 

[Konzentr8]

You mean Jaguar or Rolls Royce? Anyway, we also had our 'reasonable quality' products and those coming from the eastern neighbours decades ago. Probably, QC wasn't an abundant aspect of production.

lol no i meant British Leyland and the reason you never see a broken down RR is because the companies that recovered them from roadsides were obligated to cover them with a tarpaulin

My brothers first car was a Lada , how we laughed but it lasted for years and it's probably still in service now

 

[Bondsan]

Thanks for the chuckle. I've owned two MG's from that era and I have them to thank for having to learn how to tinker with gizmos. Worth the tinkering, though, and actually still have one of them.

 

[Nemeske]

Update on the topic: I've managed to source 3 BASS panels for only 30 EUR/panel, the dustcovers were intact on two, and panels are in good state optically.
I don't know if my analogy is good, but I still can see the conductive nylon coating on the saran through the holes, so I will pick the most matching two of 3, and use these as a substitution of the panels those are more or less faulty or maybe just way too old.


Reason:

Next to the above mentioned symptomps of those BASS panels inside the speaker, I found out with a tone generator, that the panels produce few dBs less around 80-100Hz, and can't go lower than 60Hz as the healthy side could easily, despite those are original panels, too.
I will have to tidy up them a bit, and redo the dustcovers, and I will do the swap

 

[Nemeske]

So far, I removed the old dustcovers and cellotape from the panels. Removed 2 corroded rivets from the two panels, and washed the peremiter down with denaturated alcohol and white spirit with success