Seymour Duncan Convertible 2000

[John G]

Hi,
Can anyone assist please.
I have a Convertible 2000 on the bench for repair, and have found C14 on the main board at right front (tant cap mustard) has gone up in flames.
I have searched for a schemo, but have only found the older (100) version.
I did find a link to DIYGUITARIST........but didn't work.
Can anyone help me with a schemo or the value of C14.
Many thanks
John

[Chuck H]

If no one has that schem (or the memory of an elephant if they worked on one) it may be possible to approximate the value based on the circuit. If you can draw a rough schem of some of the surrounding circuit/s and state some reference to it's location it might be possible to get a few educated guesses and some discussion that ends in decent results.

EDIT: I just looked at the only Convertible schematic I could find. It was from 1986. It was an incomplete schematic (because the different boards likely have their own reference?) but I managed to locate from C1 to C13 and from C15 to C40, but no C14 anywhere!?! So maybe I'm the victim of some cruel hoax or this weirdness is just circumstance. With my original suggestion standing, I'm outy.

[Enzo]

22uf 16v Tantalum.

I hate tantalums.


nickb has the schematics at his site, here is the preamp portion from there:
http://bmamps.com/Schematics/Seymour...000-Preamp.pdf

Power amp:
http://bmamps.com/Schematics/Seymour...0-PowerAmp.pdf

[John G]

Enzo/Chuck.
Many thanks for your replies.
Enzo, the schemos are just the ticket, I thank you.
Tants in my experience need a very stable power system around them, and quite often they seem to have a very variable working longevity.
Many thanks again
John

[Leo_Gnardo]

Tants in my experience need a very stable power system around them, and quite often they seem to have a very variable working longevity.

I don't see any advantage in replacing the tantalum cap with another tant, just use an ordinary electrolytic. Seen too many tants self-roasted for no reason. "Variable working longevity" indeed.

[John G]

Leo,
You read my mind, there is now a standard electrolytic in its place.
Cheers,
John

[Enzo]

I am just now re-reading the terrific Bob Pease "Troubleshooting Analog Circuits". And he has a chapter on passives, and discusses the various factors in chosing tantalums or films or lytics. But really, any subtle advantages a tantalum might have vanish ina guitar amp. At least in my opinion.

They are nice enough caps, but they will not tolerate ANY sort of abuse at all, like over voltage or reverse polarity.