Re: On Techie Topic : Cap's ..


"Rich Koerner" <richk@xxxxxxxxxxxxx> wrote in message
news:44912F3E.FE69788E@xxxxxxxxxxxxxxxx


wb wrote:

a message from a scholar and a gentlemen.:

-----Original Message-----
From: Ted Weber [mailto:ted@xxxxxxxxxxxx]
Sent: Wednesday, June 14, 2006 9:17 PM

A page of our website:

*****************************
"Many amp builders and repair techs insist on using those big 'ol
Sprague TVA electrolytics, probably because they are big and pretty,
they've always used them, and people are resistant to change. Yet, if
you look those up on Spragues (Vishay) website, you will find that they
are not recommended for new designs and are only recommended for
replacement where the equipment (clamps, holders, etc.) has been
designed for them or are required for some other reason (military,
warranty, certifications, etc). They then point you to their
recommended replacement, the 500D series, which is about half the size
of the TVA's. Dieletric materials and construction techniques for
electrolytic capacitors have come a long way in the past 30 years, and
we are now seeing capacitors with the same capacitance in a case that
is about half the size of the TVA's. And, they often have a higher
temperature rating. It's a win all the way around. So, don't be led to
believe that Xicons, Panasonics, and other newer type electrolytics are
no good because they are smaller."

******************************

Give me those long steel leads on those new ***, and I may use them.

I hate having to splice buss wire on those short leads used today.

Long steel leads on resistors is nice to have.

But the short soft leads today for PCB's suck in point to point units.

Try this with caps with short leads on them.

http://timeelect.com/51ampeg-18.jpg

Stress loops.

What's that.

http://timeelect.com/jimsuper-33.jpg




Regards,

Rich Koerner,
Time Electronics.
http://www.timeelect.com

Specialists in Live Sound FOH Engineering,
Music & Studio Production,
Vintage Instruments, and Tube Amplifiers

Rich,
If there's one thing I've learned here, it's never to argue with you! Of
course, you make an excellent point. There is one big difference between
what you do and what I do with guitar amps. You do this professionally,
often for professional musicians. I think it is totally appropriate to hold
to the standard you discuss when that element is present. One thing that
neither you or the customer wants is premature failure because some cap is
wiggling when it shouldn't. You represent professional excellence and set a
fine example for others. For this you should be applauded.

However, I am an amateur builder and I have a different point of view. I
can afford to have selectively lower standards. I build for fun. I don't
play out because I don't have the chops. So, this is a hobby. Those soft
leads don't bother me. (BTW, Ted's parts tend to have those long leads we
all like and want.) I'm willing to take the trade off of the soft leads for
low prices. I don't have to worry about amp failure at a gig. And that is
why I can make a different choice. I do this with my eyes open. I can't
buy in quantity (or don't want to) and keep stock for the one or two amps I
build or tinker with each year. That means it can be expensive to get just
a few of this or that. Ted Weber fills a gap here with low prices, fairly
decent parts (I got a few "loser" switches in my last order and gave him a
bunch of crap about that), and the option of buying one of this or two of
that without getting stuck for a "picking charge" or being forced to take a
minimum of 5 or 10. He charges 7 cents for one MF resistor and less than $1
for many of his e-caps. I can get a pile of mixed small parts to fill my
BOM for a homebrew for under $40 including shipping. I can't do that
anywhere else. Elsewhere, the same order would cost twice that or more.
And the amp will sound just fine. Everything has its place and every market
has its customer.

Thanks for listening.
Regards,
Phil



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