Hello,
i need some information about these valve rectifier.
I would know if it is possible use the 5R4WGB in a capacitor-input filter, with a first cap of 100 uF, or it's dangerous.
If negative, what do you think could be a right value for this cap?
40 uf, could be right?
I'm sorry, but i'm doing a Loftin White 2A3 amp, from the italian review AUDION. The originale project was by Nobu Shishido, but the review Audion set a 5R4WGY in the schematics, and i buyed them. so i'm i trouble now....
Excuse for my english, and thanks
Bye
Riccardo
i need some information about these valve rectifier.
I would know if it is possible use the 5R4WGB in a capacitor-input filter, with a first cap of 100 uF, or it's dangerous.
If negative, what do you think could be a right value for this cap?
40 uf, could be right?
I'm sorry, but i'm doing a Loftin White 2A3 amp, from the italian review AUDION. The originale project was by Nobu Shishido, but the review Audion set a 5R4WGY in the schematics, and i buyed them. so i'm i trouble now....
Excuse for my english, and thanks
Bye
Riccardo
Hi Riccardo,
I'm seeing values of 4 ~ 20 μF in the data sheets for capacitor input. 100 μF is abusive to the tube in any case, normally 40 ~ 50 μF is the max.
-Chris
I'm seeing values of 4 ~ 20 μF in the data sheets for capacitor input. 100 μF is abusive to the tube in any case, normally 40 ~ 50 μF is the max.
-Chris
The data sheet says 4 muF. max. I'm a stickler for not violating published limits and would go no higher than 4 muF.
Follow the 1st filter cap. with a low DCR choke and then pile up the energy storage.
5R4 Data Sheet
Follow the 1st filter cap. with a low DCR choke and then pile up the energy storage.
5R4 Data Sheet
A trick I do is an input cap of 10uF, then after the L, have a 220uF cap from a computer power supply. No ripple, eh? 😎
Hi Eli,
I found a data sheet that states 20 as a maximum for capacitor input. It depends on the voltage and current draw so .... But not 100 !!!
-Chris
I found a data sheet that states 20 as a maximum for capacitor input. It depends on the voltage and current draw so .... But not 100 !!!
-Chris
Hi Riccardo,
according to datasheet the input cap must be 4 uF, but the thing you had to pay more attention is the plate supply impedence that have to be not less than 2 x 125 ohm if you're using this diode in full wave rectifier, otherwise you'll reduce the tube's life.
Marcello
according to datasheet the input cap must be 4 uF, but the thing you had to pay more attention is the plate supply impedence that have to be not less than 2 x 125 ohm if you're using this diode in full wave rectifier, otherwise you'll reduce the tube's life.
Marcello
Hello, and many thanks!!!
The filter with input cap of 10uF, and then 220 uF it's interesting, i'll try with PSUII.
Chris, i have a 5R4WGB, : could you post the link of datasheet with filter input cap of 20 uF? Could be a better solution.
Marcello, thanks, i'm not so technical, so you said that's it impossible go over 4uF. Or this value it's related with plate impendance? How i can calculate that?
I haven't the datasheet of 5R4WGB...
The ampli input filter is Diode>R50ohm 10 watt> 100uF cap>L10H 150mA>100uF....
Thanks
Riccardo
The filter with input cap of 10uF, and then 220 uF it's interesting, i'll try with PSUII.
Chris, i have a 5R4WGB, : could you post the link of datasheet with filter input cap of 20 uF? Could be a better solution.
Marcello, thanks, i'm not so technical, so you said that's it impossible go over 4uF. Or this value it's related with plate impendance? How i can calculate that?
I haven't the datasheet of 5R4WGB...
The ampli input filter is Diode>R50ohm 10 watt> 100uF cap>L10H 150mA>100uF....
Thanks
Riccardo
riccardo said:
in my opinion should be: R > diode> 4 uF cap> L10H> 100uF
where R = (250 ohm - transformer DC res. ) and must be 10W or more
The datasheet is attached on eli's reply.
Bye
I like having higher value input capacitor for the power supply. It sounds better and less hum.
The 5U4G can stand for 47uF input capacitor. I think 5U4G is better the 5R4.
Johnny
The 5U4G can stand for 47uF input capacitor. I think 5U4G is better the 5R4.
Johnny
Hi Marcello,
i think what you say is very important.
i'm sorry for my english, but i try to explain:
It is'nt equal if the plate "see":
Transfomer impedance> Diode> R (250 ohm - TA impendance) 4uF etc?
You see, in the original Nobu Shishido Loftin White 2A3 project, http://www.audiodesignguide.com/se/loftin_white_2a3a.jpg
he use a rectifier 5AR4 ( From Datasheet : filter input capacitor max 40 uF) but the input filter is:
5AR4> R50 ohm 10 W >100uF > L 10H 150 mA>100uF....
So i think that could be a solution for calculate a greater input filter cap for 5R4WGB.
And i don't immagine HOW.....
Thanks
Ciao
RR
(
(quote)
in my opinion should be: R > diode> 4 uF cap> L10H> 100uF
where R = (250 ohm - transformer DC res. ) and must be 10W or more
The datasheet is attached on eli's reply.
Bye
i think what you say is very important.
i'm sorry for my english, but i try to explain:
It is'nt equal if the plate "see":
Transfomer impedance> Diode> R (250 ohm - TA impendance) 4uF etc?
You see, in the original Nobu Shishido Loftin White 2A3 project, http://www.audiodesignguide.com/se/loftin_white_2a3a.jpg
he use a rectifier 5AR4 ( From Datasheet : filter input capacitor max 40 uF) but the input filter is:
5AR4> R50 ohm 10 W >100uF > L 10H 150 mA>100uF....
So i think that could be a solution for calculate a greater input filter cap for 5R4WGB.
And i don't immagine HOW.....
Thanks
Ciao
RR
(
(quote)
in my opinion should be: R > diode> 4 uF cap> L10H> 100uF
where R = (250 ohm - transformer DC res. ) and must be 10W or more
The datasheet is attached on eli's reply.
Bye
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