replace 5y3

ardan77 · 14th January 2006, 06:26 AM

Hy,

I want to do this guitar amplifier and i don't have the 5y3 so i think to replace him with some 1n4007 but i don't know how.
So please help me.

Geek · 14th January 2006, 09:18 AM

Using 1N4007 with 100R, 10W resistors in series with each on the AC side is the standard practise, IIRC.

kathodyne · 14th January 2006, 09:21 AM

as far as i know
(pls correct me if i'm wrong!)

1. lose the heater winding.
2. use center tap on mains secondary
3. replace rectifier with SS diode, both in the direction of the circuit, one on each leg of mains secondary (1n4007,byw96d)
4, -you could use a higher value for the input cap-
5. -you might need an extra resistor before the input cap, due to a higher voltage because of using SS diodes-
6. use a standby switch to let the tubes heat before applying HV

that's it...
you don't have a slow turn on of HV now.....

-hey greg!! you beat me with typing!

......

ardan77 · 14th January 2006, 08:27 PM

Thank you for yours reply
But i don't understand i have to put the 100ohm resistors in series with every diode, and where i put the standby switch?

Witchdoctor · 14th January 2006, 10:54 PM

The reason for putting 100 ohm resistors in series with the diodes is that sand rectifiers have a lower voltage drop (approx .7 volt) than their hollow state forebearers, which have a voltage drop measured in volts.

Take the centre tap from the high voltage winding on the transformer, remove it from where it's connected, and connect it to one terminal of the standby switch, and connect the other terminal of the switch to where the centre tap was connected.

The next time you turn the amp on, turn on the main switch, wait about 30 seconds, and then turn on the standby switch and enjoy the toob sound.

kevinkr · 15th January 2006, 03:41 AM

You might want to reconsider and possibly just purchase a 5Y3, the sound will differ significantly if you switch to solid state rectifiers.

14th January 2006, 09:21 AM	#3
kathodyne diyAudio Member Join Date: Feb 2005 Location: leeuwarden, netherlands	as far as i know (pls correct me if i'm wrong!) 1. lose the heater winding. 2. use center tap on mains secondary 3. replace rectifier with SS diode, both in the direction of the circuit, one on each leg of mains secondary (1n4007,byw96d) 4, -you could use a higher value for the input cap- 5. -you might need an extra resistor before the input cap, due to a higher voltage because of using SS diodes- 6. use a standby switch to let the tubes heat before applying HV that's it... you don't have a slow turn on of HV now..... -hey greg!! you beat me with typing! ...... __________________ emission over emittor

14th January 2006, 10:54 PM	#5
Witchdoctor diyAudio Member Join Date: Dec 2005 Location: Ontario	The reason for putting 100 ohm resistors in series with the diodes is that sand rectifiers have a lower voltage drop (approx .7 volt) than their hollow state forebearers, which have a voltage drop measured in volts. Take the centre tap from the high voltage winding on the transformer, remove it from where it's connected, and connect it to one terminal of the standby switch, and connect the other terminal of the switch to where the centre tap was connected. The next time you turn the amp on, turn on the main switch, wait about 30 seconds, and then turn on the standby switch and enjoy the toob sound. __________________ Give a man a fish and he'll eat for a day. Teach him to fish, and he'll sit in a boat all day long drinking beer.

15th January 2006, 03:41 AM	#6
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	You might want to reconsider and possibly just purchase a 5Y3, the sound will differ significantly if you switch to solid state rectifiers. __________________ "Extraordinary claims require extraordinary evidence." - Carl Sagan

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14th January 2006, 09:18 AM	#2
Geek diyAudio Member Join Date: Sep 2004	Using 1N4007 with 100R, 10W resistors in series with each on the AC side is the standard practise, IIRC.

14th January 2006, 08:27 PM	#4
ardan77 diyAudio Member Join Date: Jan 2006 Location: Bucuresti	Thank you for yours reply But i don't understand i have to put the 100ohm resistors in series with every diode, and where i put the standby switch?

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