Univibe LDR alternatives

[Lithium_Grim]

Ok, reviving an old discussion . The tried and tested LDR's (NSL-7532) are EOL and/or you can find them for crazy amounts of money. Does anyone know of new (still in production) alternatives for Univibe LDR's?

I found that there are still 9203 LDR and NSL-7530, but I do not know their production status or if they are EOL.

To be short. Do you know and tested still in production LDR's that make a lush Univibe (using a lamp, not LED like, Neovibe, Habinger x, etc.)?

[BMS1971]

I have been using this one with great results:
https://www.musikding.de/Photo-cell-8k-20k-1M
regards
Benoit

[andregarcia57]

great sound!
https://tinyurl.com/2y4cj3j3
5528

[Lithium_Grim]

Thanks for the replies!

I have a whole selection of GL55 series LDR's except for the 5547 which on paper should be a good alternative.
What do you think are the primairy requirements for selecting an LDR?
Spread in resistance between light and dark? Switching speed R on to R off (and vv)? minimum resistance, maximum resistance, or something completely different?

[BMS1971]

For the the most important is light/dark R values

[BMS1971]

great sound!
https://tinyurl.com/2y4cj3j3
5528

Yes very close from what I use. did you tried it on a regular Univibe design? How accurate are they? Do you need to sort them?
Regards
Benoit

[andregarcia57]

great sound!
https://tinyurl.com/2y4cj3j3
5528

Yes very close from what I use. did you tried it on a regular Univibe design? How accurate are they? Do you need to sort them?
Regards
Benoit

hello, I have saved on instagram two videos of photocells 5549 and 5528, add me on instagram "andy.effect"

[Lithium_Grim]

Thx, however I do not have any social media anymore as I left all of them since 2022 and I must say I am still very happy I left them.
How would you compare the 2 LDRs? Is one deeper sounding than the other? Other differences?

[BMS1971]

hello, I have saved on instagram two videos of photocells 5549 and 5528, add me on instagram "andy.effect"

Will look up
Benoit

[BMS1971]

Another point to consider, removing the 4.7k resistors after the LDR, so you need a LDR with higher light resistor, easier to find.
Benoît

[BMS1971]

great sound!
https://tinyurl.com/2y4cj3j3
5528

I just got some of them, will try today and post here comments
Cheers
Benoit

[BMS1971]

So I tried 5528 on a prototype Univibe.
Oh man... They sound great! Highly recommended
Benoit

[Lithium_Grim]

How did you place them? Flat, 45 degree angle or 90 degree angle relative to the bulb. Distance to bulb? With/without light shield?

[BMS1971]

How did you place them? Flat, 45 degree angle or 90 degree angle relative to the bulb. Distance to bulb? With/without light shield?

By experience I put them flat facing up so light is coming from bouncing back from inside LDR/Lamp cover. I prefer the sound than facing directly lamp. I never tried 45°
Benoit

[Lithium_Grim]

Ok, I tested a lot of different LDR's and I found the GL-5626 very .. no extremely nice. Still have not found real NSL-7532 so if someone has some for a reasonable price I would love to buy some. Honestly I like the whole Chinese GL-55xx/56xx series and they are very useful.

[BMS1971]

Ok, I tested a lot of different LDR's and I found the GL-5626 very .. no extremely nice. Still have not found real NSL-7532 so if someone has some for a reasonable price I would love to buy some. Honestly I like the whole Chinese GL-55xx/56xx series and they are very useful.

try 5528

Benoît

[andregarcia57]

5528 ldr

[BMS1971]

5528 ldr

Try PGM5526, you can even have them with original vintage look PGM5526-MP
Ben