MN3205 vs V3205; why won't my delay work

[Bernardduur]

Hi all!

I have this old Pearl AD-08 that uses a MN3205 and a MN3102. It broke like a month ago without any real issues.
Upon inspection all seemed to function except for my MN3205. I scope the signal up to the input of the BBD where it disappears.

I tried it with a V3205 without succes. The BIAS setting makes no difference. No signal comes from the BBD.

I tried it with a BL3208 (because I have some laying around) and that works.

Do I need to buy a MN3205? Is there any difference between a MN3205 and a V3205?

Attached is the schematic

[Dirk_Hendrik]

I used V3205's without a problem in the past. I couiild be your V3205 is broken. BBD's are very vulnerable to ESD.

And.. the signal flow in your schems contines to amaze me!

[Siro78]

I know that v3205 work with limited power supply like 7V.
Try limiting V+2 at 7V if it start to work.
Bye

[allesz]

I agree with Siro: coolaudio bbds are no good for full 9V supply.

[Bernardduur]

I know that v3205 work with limited power supply like 7V.
Try limiting V+2 at 7V if it start to work.
Bye

Thanks!
I tried limiting it by adding back the 100R resistor on the ground of the adapter jack. I removed that one because it worked on a 'standard' battery for years and that battery gave me more then 9V.
Afterwards it worked like this for approx 6 years

I've added that 100R resistor back but still the unit would not function. No sounds from the delay line. I now tried it with 2 more v3205's to make sure I wasn't killing them.

In a last resort I replaced all power ELCO's and replaced all ELCO's around the BBD. They were replaced around 6 years ago when I was busy modding this pedal (TB, less noise, etc).

AND YES, IT WORKS AGAIN. Also the 'old' v3205's I still had in my parts bin work. I'm pretty happy Dunno why the ELCO's went bad..... measurements are all normal.