Author Topic: yet another Matchless Hot Box question- 10000uf cap?  (Read 1360 times)

cb

yet another Matchless Hot Box question- 10000uf cap?
« on: December 04, 2006, 08:16:19 PM »
Is that really a 10000uf cap on the bridge rectifier? Just checking, since I'm about to order a replacement.

Re: yet another Matchless Hot Box question- 10000uf cap?
« Reply #1 on: December 04, 2006, 11:13:09 PM »
man, that cap must be the size of me.!!

Paul Marossy

Re: yet another Matchless Hot Box question- 10000uf cap?
« Reply #2 on: December 05, 2006, 12:26:44 AM »
Are you looking at a schematic or the actual cap? If it's the actual cap, it's pretty obvious. A 1000uF cap seems more likely to me, though...

Dai H.

Re: yet another Matchless Hot Box question- 10000uf cap?
« Reply #3 on: December 05, 2006, 08:11:09 AM »
doesn't sound too wacky if it's for a DC filament supply. I built a Vacuum Tube Valley (magazine) preamp project once, and IIRC there were two 10,000uFs, plus two (maybe 3.3F?--an even larger value) caps for the DC filament supply (for only one tube).
« Last Edit: December 05, 2006, 08:13:46 AM by Dai H. »

fikri

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Re: yet another Matchless Hot Box question- 10000uf cap?
« Reply #4 on: December 05, 2006, 12:34:48 PM »
doesn't sound too wacky if it's for a DC filament supply. I built a Vacuum Tube Valley (magazine) preamp project once, and IIRC there were two 10,000uFs, plus two (maybe 3.3F?--an even larger value) caps for the DC filament supply (for only one tube).

 :o Man ! that must be huge enough ! Do we need such a big value for just one tube ?  ;D
But nowadays caps body is becoming smaller and smaller each day with such a big value. What i remembered last week is, i try to find replacement filter cap for my Marshall superlead, But it seems like nothin' ever fitted into the caps holder! i ended up using JJ's cap  :D

Ronsonic

Re: yet another Matchless Hot Box question- 10000uf cap?
« Reply #5 on: December 05, 2006, 12:43:10 PM »
10,000 uF is not unreasonable there. They need the oversized cap to jack up the voltage if they're trying to use a 6.3VAC tranny to get 6.3VDC after rectification and filtering.

These are not crazy large at the 10volts or so you need.

Ron
http://ronbalesfx.blogspot.com
My Blog of FX, Gear and Amp Services and DIY Info

cb

Re: yet another Matchless Hot Box question- 10000uf cap?
« Reply #6 on: December 05, 2006, 02:53:56 PM »
Thanks for the replies. As usual, this group is always very helpful.

bancika

Re: yet another Matchless Hot Box question- 10000uf cap?
« Reply #7 on: December 05, 2006, 04:05:06 PM »
I used 2200uF before regulator and 1000uf after
Maybe it's a bit overkill, but couldn't hurt :)
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