Vacuum Rectifier Question

Eli Duttman · 12th December 2007, 12:04 AM

Is anyone aware of a full wave vacuum rectifier with a forward drop greater than that of the 5Y3?

dsavitsk · 12th December 2007, 12:49 AM

A 5Y3 plus a string of diodes?

jaymanaa · 12th December 2007, 01:03 AM

5R4 is like 63 or 67 compared to the 50 of the 5Y3 I beleive. I used them once when my B+ was a little high in a SET EL34.

jaymanaa · 12th December 2007, 01:05 AM

It's actually 67 @ 250mA

dsavitsk · 12th December 2007, 01:13 AM

Duncan PSUD has the 5Y3-G dropping 15 more volts that the 5r4-G for me ...

jaymanaa · 12th December 2007, 01:17 AM

I guess it depends on the load. My RCA handbook shows the 5Y3 dropping 50v @ 125mA, and the 5R4 dropping 67 @ 250mA. Are you actually simulating?

dsavitsk · 12th December 2007, 01:32 AM

5R4-G

dsavitsk · 12th December 2007, 01:33 AM

5Y3-G

Tom Bavis · 12th December 2007, 01:37 AM

5W4 is about the same (45V drop at 100 mA), maybe a few volts more drop than 5Y3. But it's only rated for 100 mA maximum. The 5R4 drops about 30V at 100 mA, according to the curve on the data sheet.

Eli Duttman · 12th December 2007, 02:17 AM

Thanks, Tom! The 5W4 is exactly the sort of thing I'm interested in.

A Heath AA-161 carcass that's already missing the O/P trafo is being converted into a full function stereo preamp. The 6.3 VAC filament winding of the AA-161's power trafo can power a DC supply for 2X 12AX7s and 2X 12B4s. Choke I/P filtering the "raw" AC should yield something quite suitable for driving a LR8 regulated 250 VDC phono section B+ supply. A gyrator after the initial LC section will dump some Volts prior to powering the line stage. Less IS more, when it comes to dropping resistors

The 12B4s are CCS loaded at 20 mA. and an unbypassed 500 Ohm cathode bias resistor is used. I don't want to overstress the CCSes.

12th December 2007, 12:04 AM	#1
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	Vacuum Rectifier Question Is anyone aware of a full wave vacuum rectifier with a forward drop greater than that of the 5Y3? __________________ Eli D.

12th December 2007, 12:49 AM	#2
dsavitsk diyAudio Member Join Date: Jan 2005 Location: Chicago	A 5Y3 plus a string of diodes? __________________ http://www.ecpaudio.com :: http://diy.ecpaudio.com

12th December 2007, 01:03 AM	#3
jaymanaa diyAudio Member Join Date: Jan 2006 Location: Kansas	5R4 is like 63 or 67 compared to the 50 of the 5Y3 I beleive. I used them once when my B+ was a little high in a SET EL34. __________________ "Make everything as simple as possible, but no simpler" Einstein

12th December 2007, 01:05 AM	#4
jaymanaa diyAudio Member Join Date: Jan 2006 Location: Kansas	It's actually 67 @ 250mA __________________ "Make everything as simple as possible, but no simpler" Einstein

12th December 2007, 01:13 AM	#5
dsavitsk diyAudio Member Join Date: Jan 2005 Location: Chicago	Duncan PSUD has the 5Y3-G dropping 15 more volts that the 5r4-G for me ... __________________ http://www.ecpaudio.com :: http://diy.ecpaudio.com


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

12th December 2007, 01:17 AM	#6
jaymanaa diyAudio Member Join Date: Jan 2006 Location: Kansas	I guess it depends on the load. My RCA handbook shows the 5Y3 dropping 50v @ 125mA, and the 5R4 dropping 67 @ 250mA. Are you actually simulating? __________________ "Make everything as simple as possible, but no simpler" Einstein

12th December 2007, 01:37 AM	#9
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	5W4 is about the same (45V drop at 100 mA), maybe a few volts more drop than 5Y3. But it's only rated for 100 mA maximum. The 5R4 drops about 30V at 100 mA, according to the curve on the data sheet.

12th December 2007, 02:17 AM	#10
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	Thanks, Tom! The 5W4 is exactly the sort of thing I'm interested in. A Heath AA-161 carcass that's already missing the O/P trafo is being converted into a full function stereo preamp. The 6.3 VAC filament winding of the AA-161's power trafo can power a DC supply for 2X 12AX7s and 2X 12B4s. Choke I/P filtering the "raw" AC should yield something quite suitable for driving a LR8 regulated 250 VDC phono section B+ supply. A gyrator after the initial LC section will dump some Volts prior to powering the line stage. Less IS more, when it comes to dropping resistors The 12B4s are CCS loaded at 20 mA. and an unbypassed 500 Ohm cathode bias resistor is used. I don't want to overstress the CCSes. __________________ Eli D.

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
Rectifier question	ifeliciano	Tubes / Valves	4	24th September 2006 08:26 PM
SD05 rectifier question	stef1777	Parts	1	21st February 2006 08:48 AM
Bridge Rectifier question	hotscot	Power Supplies	14	15th January 2006 04:15 PM
hybrid rectifier question	dr.strangelove3	Tubes / Valves	17	4th October 2005 01:28 AM
Regulated vacuum tube rectifier cct.	Circlotron	Tubes / Valves	5	14th May 2003 03:21 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