inductor filter 5 henry

[niamex]

Hello everyone,
Will you please suggest may I replace a 5H filter inductor with a 1H Triad inductor ?
Thanks in advance for your help.

 

[jan.didden]

A 1H is 5 times as small inductance as 5H.
How can that be answered without knowing the applicantion of use?
Do you think a 5 x smaller value has no effect on the equipment? Then why not go to 0.5H, or 0.1H, or zero H and throw out the inductor??

Jan

 

[niamex]

Thanks for education. Since I am a newbee in this subject I believe you are absolutely right, but looking at the price of such an inductor /hammond/ I really do not accept spending that money on a cheap chinese tube amp /five times or so more expensive than the amp itself/.Therefore I am looking for some compromise. On top I have here 6 filters TRIAD 1 HY each and looking for some solution using them. So please share your oppinion.
Thanks

 

[jan.didden]

If your amp is designed for a 5H inductor, you can't just replace it by a 1H inductor.
But you can post the schematic here and knowlegeable people can advise what in that particular case your alternatives are.
I suspect it is in the power supply ripple attenuation section?

Jan

 

[niamex]

This is the amp, there is a variant with 4 diodes as well

 

[jan.didden]

Unreadable. Try a higher resolution pic.

Jan

 

[huggygood]

 

[niamex]

Thanks

 

[niamex]

Any suggestions on modes welcomed
Thanks

 

[jan.didden]

So I assume it is L1.
Well, tube CLC supply experts, fire away!
Hammond has 120mA 5H chokes for < $ 30.

Jan

 

[niamex]

Right, it is L1. Now expecting the experts decision

 

[niamex]

 

[niamex]

 

[niamex]

I will go to the variant you suggest
Thanks

 

[Chris Hornbeck]

Ah, so this is a new project? Maybe connect all of your 1H chokes in series and try it. It only has to be quiet enough for your speakers in your room and your hum tolerance. You might or might not like the frequency response coloring of the amplifier's high output impedance, so noise may not be the biggest issue, long term, but the joy is in the building.

All good fortune,
Chris

 

[niamex]

Thanks Chris, I qwas planning something like that but was not sure/ Now I will go ahead full speed. What do you think, shall I stay with half /two diodes/ or go to four of them ??

 

[Chris Hornbeck]

Just to be clear, your post #13 shows a different transformer than post #12? The drawing, with its center tap and ambiguous placement of "230V 120mA" could be misinterpreted.

If I'm being over-cautious and you understand the difference, then a full wave bridge better utilizes the mains transformer.

All good fortune,
Chris

 

[jan.didden]

Yes. It might be the same xformer which would double the output with the bridge.

Jan

 

[niamex]

Yes, they are different trafos /mine is not exactly same/ and I will choose one of them dependigng on the rectification - full or half, I am a bit afraid, that in case of full /grez/ rectification the voltage will go much high - 250 V x 1.41 so maybe the half will be better - I have I have a trafo with 2 x 250 V with center so can go both ways.

 

[Zung]

With 1H, the ripple is about 0.2V, or -64dB rel. 310V. You should be good.
Download LTspice, run the attached PS01.asc, feel free to play around with the values, guarantied no magic smoke.
I always simulate a circuit, no matter how trivial, before committing.