47pf Cap in Express PI
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- Ron Worley
- Posts: 908
- Joined: Mon Dec 24, 2007 8:21 pm
- Location: Keller, TX
47pf Cap in Express PI
OK, dumb question time.... I obviously need to study more...
The small blue (Mica??) 47pf cap on the back side of the Phase Inverter:
-What's it's function
-Any ideas on the make / model used in Francesca? Trying to complete a BOM.. which I will share with the board for review if nothing else.
Ron
The small blue (Mica??) 47pf cap on the back side of the Phase Inverter:
-What's it's function
-Any ideas on the make / model used in Francesca? Trying to complete a BOM.. which I will share with the board for review if nothing else.
Ron
Last edited by Ron Worley on Fri Jan 18, 2008 12:17 am, edited 1 time in total.
Re: 47pf Cap in Express PI
Suppresses high frequency oscillations. It's considered good practice on anything Marshallesque or otherwise hi gain.Ron Worley wrote:What's it's function
- Noel Grassy
- Posts: 426
- Joined: Thu Feb 09, 2006 5:29 am
- Location: Vacuum Tube Valley-Cali
Re: 47pf Cap in Express PI
Dude, pardon me, Ron, I used to see those little caps at a surplus joint I frequented and now they don't seem to exist anymore. I think they're just ceramic caps under a nice dollop of epoxy. They might have been labeled ITT, IIRC. Sorry I can't be of more help, NG
All excellent things are as difficult as they are rare__B Spinoza
- Ron Worley
- Posts: 908
- Joined: Mon Dec 24, 2007 8:21 pm
- Location: Keller, TX
Re: 47pf Cap in Express PI
Which explains why I haven't seen it before.... I have been working on Fenders since I started messing with amps!
Thanks Jay!
Ron
Thanks Jay!
Ron
- Ron Worley
- Posts: 908
- Joined: Mon Dec 24, 2007 8:21 pm
- Location: Keller, TX
Re: 47pf Cap in Express PI
Thanks NG..... When you look at the Mouser and Allied catalogs, there are just sooooo many ceramic caps shown...
Anybody have a solid recommendation here from their builds?? Allynmey would know, but he's tied up at NAMM at this point.
Ron (or dude, whatever works)...
Anybody have a solid recommendation here from their builds?? Allynmey would know, but he's tied up at NAMM at this point.
Ron (or dude, whatever works)...
Re: 47pf Cap in Express PI
panasonic ceramic from digikey. work perfectly
germ
germ
- Noel Grassy
- Posts: 426
- Joined: Thu Feb 09, 2006 5:29 am
- Location: Vacuum Tube Valley-Cali
Re: 47pf Cap in Express PI
Ron, I may have found them on Allied's cat page #1459. This is a CKE HV capacitor with all the capabilities you desire in a cap. Good luck, NG
All excellent things are as difficult as they are rare__B Spinoza
- Ron Worley
- Posts: 908
- Joined: Mon Dec 24, 2007 8:21 pm
- Location: Keller, TX
Re: 47pf Cap in Express PI
NG-
I have the 2008 catalog, that page is shrink tubing.....
Can you spare the P/N of said cap???
Thanks,
Ron
I have the 2008 catalog, that page is shrink tubing.....
Can you spare the P/N of said cap???
Thanks,
Ron
- Ron Worley
- Posts: 908
- Joined: Mon Dec 24, 2007 8:21 pm
- Location: Keller, TX
Re: 47pf Cap in Express PI
Thanks Paul, I assume that a 500V value will be adequate for this purpose.
Ron
Ron
Re: 47pf Cap in Express PI
I think you want a 1KV. I remember reading an article before on cap performance and the ceramics changed markedly between voltage ratings.
The cap in Francesca is 1KV.
The cap in Francesca is 1KV.
- Ron Worley
- Posts: 908
- Joined: Mon Dec 24, 2007 8:21 pm
- Location: Keller, TX
Re: 47pf Cap in Express PI
Roger that, thanks for the Help!!
Ron
Ron