SCR cap source

From IZZYZV–(at)–VS.OAC.UCLA.EDU Sat Oct 7 21:10:04 CDT 1995
From: IZZYZV–(at)–VS.OAC.UCLA.EDU (David Anderson)
Subject: Re: Solen bipolar caps
Date: 5 Oct 1995 16:47:51 GMT

In article <44v5c7$8q--(at)>, michael_ken–(at)–
(Mike Kent) wrote:

> I read lately that, contrary to common belief, you can in fact use
> high value nonpolar caps to replace electrolytic filter caps (I think
> I read it in Vintage Guitar Magazine…and not in a Torres article so
> it must be true 🙂 ). Locally I can get Solen caps that will handle
> 400 volts d.c., (and 200 volts a.c.) They’re expensive, i.e. at
> least $4 to $8 each, but will probably outlive the rest of the
> amplifier.
> Can anyone reading confirm that you can use suitable nonpolar caps to
> replace electrolytics? Any comments re. audible differences–are they
> ‘better’ at reducing ripple (i.e. more ideal than electrolytics)?
> Thanks.
> –Mike.

Mike, when you say “nonpolar caps,” I assume you mean film caps as opposed
to non-polarized electrolytics. Solen and SCR both make high voltage,
large value film caps, usually metallized polypropylene. You can get SCRs
>from Michael Percy Audio (415) 669-7181. [Pause for earthquake, about a 4,
I’d say–Los Angeles] He has a whole line rated at 630VDC and some at

These caps are better IN EVERY WAY than electrolytics. The only advantage
electrolytics have is large capacitance in a small space, period.

And $4 to $8 is not expensive. You’d pay about the same for a
multisection electrolytic can capacitor.

David Anderson


Buy the Book!

I cleaned up my tab for Sonny Boy's Help Me and made it into a short book. There's a Kindle version for 99 cents, and if you buy the paperback you get the Kindle free.

Playing "Help-Me" In the Style of Sonny Boy Williamson II: A step by step, note for note analysis of some of Sonny Boy's Signature Riffs

I also write Science Fiction, so you can sample some of my best stories. Also available in Kindle format.

Error Message Eyes: A Programmer's Guide to the Digital Soul

Optimus MPA-125 P.A. amplifier for repair. Works but needs help.

$9.99 (0 Bids)
End Date: Sunday May-26-2019 16:36:54 PDT
Bid now |
Fabric Tweed tolex woven brown strip coated 18x72" DIY repair amp speak cabinet

End Date: Monday May-27-2019 1:11:05 PDT
Buy It Now for only: $23.00
Buy It Now |
Trace Acoustic Elliot TA Series TA70CR TA 70 Acoustic Guitar Amp - PARTS REPAIR

End Date: Monday May-27-2019 9:14:25 PDT
Buy It Now for only: $149.99
Buy It Now |
Lot of Vintage Amplifier Guitar Pot Parts for Project Repair

$9.99 (0 Bids)
End Date: Monday May-27-2019 10:23:37 PDT
Bid now |
Mackie SRM450 V2 400 Watt Amp Module For Parts Or Repair (Non Working Amp)

$75.00 (0 Bids)
End Date: Monday May-27-2019 12:35:41 PDT
Bid now |


The JT30 Page Popular links

I began collecting data about the microphones used by blue harp players before there was an internet. I began organizing it into in the late 1990s. I accumulated more stuff than I remember. This is some of it.

Street Theory

A Harp Player’s Guide to Music Theory

Learning Harp

Picking Up Blues Harp

A guide to learning to play Blues Harp

Microphone Information

Usenet Articles

Harp Amps

I've been collecting Harp Amps for a while. This is the old website. There is lots of information here. Here a coupld of links.

Harp Tab

A collection of songs and riffs that I’ve worked out over the years, plus some libraries of stuff I’ve converted to tablature. I’ve included most of the notes and instructions that helped me when I was learning to play blues harmonica.

Basic Riffs Simple harp tabs for songs Blues riffs and phrases.

Harp-L Archives 1992 to 2002


Harp Frequently Asked Questions