SS Rectification

coldcathode · 5th October 2009, 01:57 PM

Looking for opinions.

I need a B+ of a little of 400V for something I am working out (slightly modified williamson with 1625's Triode strapped)

My Power Tranny only has 340-0-340 so with Tube rectification my voltage loss is to high.

I have not used SS rectification for the B+ before (I like tubes) but in this case I am willing to go to SS to use available parts.

Recommendations on what Diodes to use?

need 420-430 @ 200mA

boywonder · 5th October 2009, 03:08 PM

I use Fairchild 8A 1200V FREDs bypassed with 10 nf 2000V ceramic caps

(Assuming CT FW)

http://www.fairchildsemi.com/ds/IS%2FISL9R8120P2.pdf

Available at Mouser or Michael Percy

coldcathode · 5th October 2009, 03:20 PM

Boywonder,

The looking at the data sheet the cathode is tied to the metal flange.

when you use these how do you Isolate it from the chassis and do you use any heatsinking?

boywonder · 5th October 2009, 03:38 PM

I don't tie them to the chassis or use any heat sinks. They are rated for 8A, and we are usually running 200ma or so through them. These are usually around $1.80/ea at Mouser, I noticed that they are presently 75 cents/ea and they will not be stocked in the future...

coldcathode · 5th October 2009, 03:41 PM

I'll probably order a dozen or so then, sounds good.

Thanx

5th October 2009, 01:57 PM	#1
coldcathode diyAudio Member Join Date: Jan 2009	SS Rectification Looking for opinions. I need a B+ of a little of 400V for something I am working out (slightly modified williamson with 1625's Triode strapped) My Power Tranny only has 340-0-340 so with Tube rectification my voltage loss is to high. I have not used SS rectification for the B+ before (I like tubes) but in this case I am willing to go to SS to use available parts. Recommendations on what Diodes to use? need 420-430 @ 200mA

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Tube vs. Semiconducter rectification	Richard Ellis	Tubes / Valves	44	14th August 2008 04:20 AM
FWCT Rectification	ThSpeakerDude88	Tubes / Valves	7	24th July 2007 05:14 AM
rectification	nhuwar	Tubes / Valves	9	28th January 2007 09:16 PM
ac voltage after rectification	raif	Chip Amps	15	3rd June 2005 11:10 AM
Different type of rectification?	officeboy	Chip Amps	2	13th February 2004 10:48 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read

5th October 2009, 03:08 PM	#2
boywonder diyAudio Member Join Date: Jan 2008 Location: So.Cal.	I use Fairchild 8A 1200V FREDs bypassed with 10 nf 2000V ceramic caps (Assuming CT FW) http://www.fairchildsemi.com/ds/IS%2FISL9R8120P2.pdf Available at Mouser or Michael Percy

5th October 2009, 03:20 PM	#3
coldcathode diyAudio Member Join Date: Jan 2009	Boywonder, The looking at the data sheet the cathode is tied to the metal flange. when you use these how do you Isolate it from the chassis and do you use any heatsinking?

5th October 2009, 03:38 PM	#4
boywonder diyAudio Member Join Date: Jan 2008 Location: So.Cal.	I don't tie them to the chassis or use any heat sinks. They are rated for 8A, and we are usually running 200ma or so through them. These are usually around $1.80/ea at Mouser, I noticed that they are presently 75 cents/ea and they will not be stocked in the future...

5th October 2009, 03:41 PM	#5
coldcathode diyAudio Member Join Date: Jan 2009	I'll probably order a dozen or so then, sounds good. Thanx

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)