[R-390] Capacitor replacement C609 Audio Deck 8 uFd, 30V

[bill kirkland]

I have always loved how the bar on tantalums is the positive while on
electrolytic it is negative.
This has led to endless fun in the lab on the 1st cut pcbs. Plug'em in and
wait for the inevitable
 Pop of the tantalums.  Rumour has it one poor summer student s**t himself

Thanks for the info Tisha.

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of Tisha Hayes
Sent: March-02-13 8:36 AM
To: r-390 at mailman.qth.net
Subject: [R-390] Capacitor replacement C609 Audio Deck 8 uFd, 30V

I found a perfect replacement capacitor for the sometimes leaking and
corrosive C609 8 uFd, 30 volt tantalum cap on the bottom of the audio deck.
On eBay there is a seller who has the next version of the 8 uFd cap but at a
35 volt rating. This is not a liquid filled tantalum but one of the solid
bodied, later versions. Just do a search on Kemet Tantalum axial 8uF. They
are being sold in lots of 10 for $4.99 per pack.

Auction;  230807410986

I have used Kemet tantalum caps before on some circuit design work before
back in the 80's and 90's. They are very good caps. A few times I had caps
fail due to transients (lightning) and they crack apart, release stinky
smoke but no acid residue. The ones for sale right now are rated at 35 volts
where the originals in the receiver were rated at 30 volts.

Tantalum caps are usually not available in voltages much past 100-200 volts.
The design of the capacitor is fairly unique and does not adapt well to
higher voltage applications. These caps are about the size of a 1 watt
resistor.

On the auction the "5 sold" were to me (I have 50 of these little caps). I
will keep them in my bottomless purse so if I meet any of y'all at a hamfest
I will give you a couple. My friend Perry will get a bunch when I meet him
up for the Tullahoma TN hamfest in a few weeks.

I have no idea how many the seller has available. I have no relationship
with this person. Hopefully they have thousands!
--
Ms. Tisha Hayes/ AA4HA


*"neque est alter hujus universi locus quam anima"*
*('For there is for this universe no other place than the soul or mind')*
*-Arthur Schopenhauer*
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