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Re: [TenTec] Corsair II realignment: DIY?

To: geraldj@weather.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Corsair II realignment: DIY?
From: Joe Roberts <jroberts@io.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sun, 02 Jan 2011 09:05:50 -0500
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
On 1/2/2011 2:20 AM, Dr. Gerald N. Johnson wrote:
> Mouser carries Vishay-Sprague Atoms. They seem to be the same high
> quality they originally were. Much larger for better heat dissipation
> than the miniatures too.

I believe they are now a big can with a little cap tucked inside. I use 
them in guitar amps, which is probably their biggest market. They are 
now super light for the size...used to be they felt like a battery!

Nichicon and Chemi-Con make much better HV caps (long life, low 
impedance) but they are going to be small radials, not big chunky axials 
that look right and fit vintage tag strip layouts.

Best grades of axials today might be the ones made by Vishay/BC 
Components with the blue transparent wrapper (used to be Philips)


No idea where to get the high grade versions in small quantities from a 
distributor. You also have to watch the size with axials...the ones TT 
used in Tritons and Omni Cs were miniaturized even by today's norm.

> I hadn't considered drilling new holes in the board to use radial caps,
> but I think I'd be inclined to have spliced one of the leads on a radial
> cap so it could routed to the original holes.

That was my inclination also. Radial leads will usually span the axial 
holes. However, providing appropriate holes for radials looks better and 
is more mechanically stable. I had visions of shorts when installing 
radials with 2 or 3mm spacing with long unsecured leads. The leads are 
mighty close together on a 1uf radial cap.

Also, a long lead could have more reactance at/above 30mHz than the 
capacitor itself. Many of these modern digital-ready caps, like Os-Cons 
and motherboard caps, are very low Z well into the VHF range.  A 1/2" 
lead would be significant in this regard, degrading the performance of 
the cap.

Plus, in about 30% of the cases, I could find a shorter path to ground 
with a new hole, further shortening the leads. It might not matter all 
that much, but the performance boost is free!


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