Home » Audio » Group Build » Power Tx question - Dumb question
Re: Power Tx question - Dumb question [message #31169 is a reply to message #31168] Fri, 10 June 2005 23:24 Go to previous messageGo to next message
colinhester is currently offline  colinhester
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Registered: May 2009
Location: NE Arkansas
Illuminati (3rd Degree)
Awesome!! What I need are a pair of Txs rated at: 800VCT @ 210mA; 5V @ 2A; and 6.3V @ 5A. If you got something that will fit the bill, let me know and I'll try to take them off your hands.....Colin

ummmmm.... [message #31171 is a reply to message #31162] Sat, 11 June 2005 07:47 Go to previous messageGo to next message
PakProtector is currently offline  PakProtector
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Registered: May 2009
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A PS with 10 caps per chanel is *NOT* what I'd call simple. What is B+? if it is under 1kV, you can use 440VAC caps quite comfortably. GE dual rated theirs at 1kV DC and 440VAC. ASC is similar. The 440's from ASC are labeled 900 VDC. They also come in 40 uF cans.
regards,
Douglas



Clarification [message #31172 is a reply to message #31171] Sat, 11 June 2005 09:47 Go to previous messageGo to next message
colinhester is currently offline  colinhester
Messages: 1349
Registered: May 2009
Location: NE Arkansas
Illuminati (3rd Degree)
The original article I'm getting the schematic from calls for some pretty rare caps: PCB-filled Cornell-Dubliner Model 121J.

The power supply section is a 5R4WGT rectifier followed by an CLCLC. The first C is 10uF @1000V; L is 8H @200mA; next C are 5 10uF @600V; next L is 20H @ 50mA and the last C are 4 10uF @ 600V.

I'm hoping, as you suggested, to use 50 and 40uF, respectively, in the last two C sections.

The B+ is 430V, so it looks like stock 440V oil caps should do the trick across the board, including the 10Uf @ 1000V.

Thanks for the help.....Colin

shewwww... [message #31173 is a reply to message #31172] Sat, 11 June 2005 10:11 Go to previous messageGo to next message
PakProtector is currently offline  PakProtector
Messages: 935
Registered: May 2009
Illuminati (2nd Degree)
You can get away with 370VAC at that B+. They come packaged down to less than 5 uF too.

I have some GE caps that are Pyranol filled and AC rated to 660vac. They make really nice speaker cross over caps. I replaced them with some 23F*** AC caps which are also PCB. They do sound good. Wish I had enough for use in a PS. The second place sol'n is the 440vac rated, modern motor-run types. A very close second I must say.

I can't quite reconcile why what has to be a thicker film seems to sound better. Oh well, just because there are no answers today does not mean that they won't appear sometime If we keep looking.
regards,
Douglas


Re: Power Tx question - Dumb question [message #31174 is a reply to message #31169] Sat, 11 June 2005 18:28 Go to previous message
Forty2wo is currently offline  Forty2wo
Messages: 163
Registered: May 2009
Master
Hi Colin,
I think these are just the ticket.

They are 800VCT @200ma, 5VCT @2A, 5VCT @3A, 6.3VCT @6A

There will be no problem at 210ma if you don't fully load all of the other secondarys.
They were for the DRD but I have decided to go with a transformer that will support a 45 or 2A3 as well as 300B...More on this in a little bit

Let me know and I will send them out...John

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