[sdiy] "VINTAGE AUDIO" capacitors

[Harry Bissell]

Truly, 'metallized polyester' and 'film and foil' caps are vastly different. At least in
pulse applications. Which (frankly) I doubt makes much difference in a guitar amp where the
impedances are much higher and the signals (frankly again) have some limited slew rates...

Now if you're snubbing an really big IGBT...

BTW, did you know that you can get capacitors with genuine COPPER lead wires instead of steel,
for applications where the steel leads would induction heat ??? (not in my guitar amp...)

H^) harry


----- Original Message -----
From: Dan Snazelle <subjectivity at hotmail.com>
To: George Mattson <axisair at comcast.net>
Cc: Dave Manley <dlmanley at sonic.net>, <synth-diy at dropmix.xs4all.nl> <synth-diy at dropmix.xs4all.nl>
Sent: Sat, 13 Aug 2011 00:29:13 -0400 (EDT)
Subject: Re: [sdiy] "VINTAGE AUDIO" capacitors

I always enjoy these snake-oil threads

Sent from my iPhone

On Aug 13, 2011, at 12:15 AM, "George Mattson" <axisair at comcast.net> wrote:

> LOL.
> 
> I don't know how people have the balls to pull that stuff off.
> 
> When I learned electronics, we were making our own capacitors out of jars,
> wood rocks, paper using tin foil. We didn't have pure aluminum wrap
> available back then. :)
> 
> But, we made coils out of toilet paper rolls, oatmeal boxes, wooden dowels. 
> 
> The good old days. At least we didn't stael the BBQ charcoal to make
> resistors...
> 
> You also have to keep in mind that Hi-Fi audio back then really sucked
> compared to newer technology. Wider spectrum reproduction and just plain
> flat better speakers. And, they came up with TWO of them...Oh, wow. Heaven
> was realized in that new fangled stereo concept. Once they quit pressing
> vinyl, we finally had a good bottom end without eating up 15 minutes of
> available real estate to do it.
> 
> 
> 
> 
> 
> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Dave Manley
> Sent: Friday, August 12, 2011 8:51 PM
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] "VINTAGE AUDIO" capacitors
> 
> On 8/12/2011 7:43 PM, dan snazelle wrote:
>> there is a link to an interview with him (quote is below)
>> 
>> what does this mean (ac pulse response)
>> 
>> 
>> John Gaynor: I am working on several types of capacitors currently but my
> original capacitors are based on the same material used in the Phillips caps
> in the 60's. They are based on a polyester (Mylar) and aluminum foil. Most
> capacitors today are a metallized polyester. They vacuum impregnate the
> Mylar with an aluminum spray. They do not have the same AC pulse response as
> the true film and foil caps and you can plainly hear it.
>> 
> 
> Bah!!! Polyester and aluminum foil.  What does he know.
> 
> You want to use the "Leyden" brand - GLASS and FOIL
> 
> Those, and only those will give a vintage sound.
> 
> -Dave
> 
> Sorry, but they don't come in orange or mustard yellow.
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-- 
Harry Bissell & Nora Abdullah 4eva