[sdiy] Sprague 150D "Tantalex" caps as audio coupling caps?

[Harry Bissell]

If they are used in a circuit with a definite DC bias, they might be OK. I's tend to
avoid tantalum caps for coupling audio signals (audio path), unless I absolutely needed
the large values they could provide.

In applications where the DC bias is unknown or unpredictable, avoid polarized capacitors.

Some people have reported they use two back to back tantalums (negative sides tied together) with
a bias resistor to the most negative supply. This would usually work OK in terms of running the capacitors
with defined polarity, but also runs the risk of introducing noise from the negative supply directly
into the audio path...  Be careful.

H^) harry


----- Original Message -----
From: aankrom <aankrom at bluemarble.net>
To: synth-diy at dropmix.xs4all.nl
Sent: Sun, 29 Apr 2012 13:09:04 -0400 (EDT)
Subject: [sdiy] Sprague 150D "Tantalex" caps as audio coupling caps?

I seem to recall reading somewhere that someone (maybe on the 
DIYstompboxes or DIYaudio forum or maybe just a web page about different 
caps...) that they had used Sprague 150D "Tantalex" caps as audio 
coupling caps with good results. Anyone else have experience with these 
in this regard? I ask because I have a decent collection of various 
sizes. They look like they'd stand up to time quite well, being 
hermetically sealed much like PIO caps. I have no doubt that they'd work 
great as bypass caps or for power supply decoupling. I'm curious about 
their audio performance compare to run-of-the-mill tantalum caps (which 
I am usually loathe to use) or aluminum electrolytics. Can't remember if 
I've asked about these before...

AA
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-- 
Harry Bissell & Nora Abdullah 4eva