If CA3080's are out of production, what are reissue Dynacomps based around?

[skiraly017]

I don't know why I thought of this. Anyone know?

[Rocket Roll]

From http://www.analogman.com/rossmod.htm (near the bottom of the page):

In early 2008 we found that Dunlop is making a new version of the Dynacomp, I guess they ran out of the CA3080E chips. They are using an LM13700N chip which appears to be an updated dual version of the 3080. They seem to be using just one side of the chip. We have not come up with a mod for this version of the Dynacomp yet. It has a red circuit board and 06/01/2007 printed on it near the part numbers.

[frequencycentral]

I just LOVE 13700s! I do have a stash of the older metal can 3080s and 3094s though.

[skiraly017]

Rocket Roll - Thank you.

frequencycentral - Please check your PM's.

[SISKO]

http://tonepad.com/getFile.asp?id=121

[JDoyle]

It should be noted that there IS a difference between the 13600 and the 13700...

...But if you are using it to replace the 3080 you won't have any problems.

[skiraly017]

http://tonepad.com/getFile.asp?id=121

Has anyone built this? Looks interesting.

[StephenGiles]

It should be noted that there IS a difference between the 13600 and the 13700...

...But if you are using it to replace the 3080 you won't have any problems.

What is the difference ? I have used both in various circuits and it made absolutely no difference to the sound at all.

[frequencycentral]

It should be noted that there IS a difference between the 13600 and the 13700...

...But if you are using it to replace the 3080 you won't have any problems.

What is the difference ? I have used both in various circuits and it made absolutely no difference to the sound at all.

Wikipedia: "The LM13700 is like a standard op-amp: both have a pair of differential inputs and a single output, but an OTA is voltage in and current out rather than voltage in and voltage out; and OTAs are programmable via the IABC pin. Linearizing diodes at the input reduce distortion and allow increased input levels. The darlington outout buffers provided are specifically designed to complement the wide dynamic range of the OTA. This chip is very useful in audio electronics especially in analog synthesizer circuits like voltage controlled oscillators, voltage controlled filters, and voltage controlled amplifiers. The darlington output buffers on the LM13700 are different from those on the LM13600 in that their bias currents (and hence their output DC levels) are independent of IABC pin. This usually results in performance superior to that of the LM13600 in audio applications." http://en.wikipedia.org/wiki/Lm13700

THE LM13600/LM13700 STORY:  http://www.idea2ic.com/LM13700.html

[frequencycentral]

Bump for edit