Strange Tantalum capacitor codes?

[alistair016]

Hey everybody,

Just looking for a little bit of advice. I'm repairing some old-ish (1970's) East German audio electronics, and I've got some dodgy Tantalums that need replacing. However, they have codes on them I've never seen. As well as showing the positive pin and stating 35v, they merely say 1, 2.2 and 4.7 (there are 3 different caps).
I'm guessing they mean uF judging by there size, but I'm not really sure, it could just as easily be pF. For what it's worth, the 1 and 2.2 are green, and the 4.7 is blue.
Has anyone seen these before?

 

[wkrug]

I think you are right with 2,2µF an 4,7µF.
That are typical values for Tantalum Capacitators.

I would replace them with this one Vielschicht, SMD G1206, High-Cap reichelt elektronik - OnlineShop f
( reichelt elektronik - OnlineShop f Order Code X7R-G1206 4,7/50 ).
That parts shoud make much less trouble than Tantalum Capacitators.

Older Tantalum Capacitators get be often short circuit.

 

[alistair016]

Thanks for that. I replaced them with those value Tantalums and all problems fixed! I understand there are positive and negative aspects to the tantalums, but it's in the signal path of the audio so I wanted to keep it as close to original as possible.