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