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Where to buy a good vactrol ?
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Jan Audio:
Americans minimum order : 10
Others : 50
schmitt trigger:
Well I am in Mexico, as as you can see in the attached images, it will allow me to order in multiples of 1, 5 10 or 50. You have to change the part number's last prefix.

Could it be related to EU customs?
Moshly:
I did some test using different colours a while back, (see attached).

Looks like the modern high brightness red give the most liner response.

HB Red: 90's translucent red high brightness
R,G,B: modern water clear Chinese high brightness RGB
UV: modern water clear Chinese
Green O: 80's opaque green

Notes: Graph is LOG/LOG
HB Red:red line touches top of graph.
Jan Audio:

--- Quote from: schmitt trigger on April 04, 2020, 08:19:59 pm ---Well I am in Mexico, as as you can see in the attached images, it will allow me to order in multiples of 1, 5 10 or 50. You have to change the part number's last prefix.

Could it be related to EU customs?

--- End quote ---

No the minimum order,
customs here are from €22,- + €13,- handling fee.
I like to order the maximum of 5 packages for 12,50 nothing more.
Its ok, at least they dont geo-block like other shops.

I am going for 100 piece optoresistor from china ( 5 types ) for almost 5 dollar.
floobydust:
Found a bit more Vactrol data. The spectral mismatch (red vs green drive) is intentional it seems.

I'm not sure what CdS cell size has to do with anything, beyond power dissipation. Those chinese CdS cells are tiny.
I have some huge old GE CdS cells hermetically sealed glass lens and their gamma γ (which is like a thermistor Beta) spec is high. I think that's from the number of squiggles the cell has between electrodes.
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