Thanks for that Dieter, the model I had seen is apparently the classic type for a buchla sound.

Sent from my iPhone

On 23 Jul 2015, at 08:56, yahoo@... 1 < Doepfer_a100@yahoogroups.com > wrote:

>> Hi to all of you,
>>
>> I’m looking to replace the victors in my Doepfer A-010-2 Low Pass Gate, in order to get the longer ringing sound of
>> Buchla gear. Would the VTL5C3 be the right one to go for
>>
>> Regards,
>>
>> Neil
>
> I think any vactrol will work in principle. But the vactrol type and the matching of the vactrols may affect the sound result
> (frequency response/range, VCA amplification range). We select the two vactrols used in each A-101-2 module: same LDR resistance at
> a certain LED current (about in the middle of the frequency range). That's not perfect because the response curve may still deviate
> from this matching point but it's better than using totally unmatched vactrols.
>
> Best wishes
> Dieter Doepfer
>
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