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Hammond 159zl as clc choke
Hammond 159zl as clc choke
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Old 27th February 2016, 05:10 AM   #1
Hikari1 is offline Hikari1  United States
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Default Hammond 159zl as clc choke

So...I just tried a pair of Hammond 159zl chokes in my f5. 23v rails, dual pair of mosfets. Replaced crc setup. Whoa. Iam liking what I am hearing. It's not placebo.

Do these things (Hammond chokes) break in?

What's the best place or position in the chassis to put them? I could mount the further away from the boards with farther leads or closer to the caps with shorter leads.

Is it advisable to twist the in/out wires on the chokes?
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Old 27th February 2016, 05:39 AM   #2
John C is offline John C  United Kingdom
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there may be a break in period..

I would tend to keep the leads short

I would not twist the in/out wires as you may couple noise from the in wire to the out wire.
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Old 27th February 2016, 09:05 AM   #3
Zen Mod is online now Zen Mod  Serbia
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Hammond 159zl as clc choke
Quote:
Originally Posted by Hikari1 View Post
So...I just tried a pair of Hammond 159zl chokes in my f5. 23v rails, dual pair of mosfets. Replaced crc setup. Whoa. Iam liking what I am hearing. It's not placebo.

Do these things (Hammond chokes) break in?

What's the best place or position in the chassis to put them? I could mount the further away from the boards with farther leads or closer to the caps with shorter leads.

Is it advisable to twist the in/out wires on the chokes?
they will break if they fall from enough distance from ground

away from pcbs is better

twist every pair of wire with slightest amount of AC across them ; so - twist those too

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Old 27th February 2016, 10:38 AM   #4
wdecho is offline wdecho  United States
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I have thought about putting some chokes in my PS so this is good news. I did not think it would effect the sound too much is the reason I have not. Chokes are pretty common in Tube amps.

Nothing to settle in or break in. It's just coils of wire making an electromagnet. Being an electromagnet it does, as Zen says, have a field around it.

Last edited by wdecho; 27th February 2016 at 10:42 AM.
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Old 27th February 2016, 01:38 PM   #5
eduard is offline eduard  Netherlands
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Hello,
I have been using Hammond and Lundahl chokes in both high and low current circuits.
Take a look at the following link.
Lundahl Transformers - Tube amplifier transformers
Greetings, Edward
P.s on his website there is also some info about higher admissable current to the lundahl filament chokes when the voltage is lower> Because Pass amps use very moderate dc voltages it can possible to use a choke with high mH rating. I would not worry to much about dc serie resistance
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Old 27th February 2016, 10:27 PM   #6
tubesguy is offline tubesguy  United States
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Quote:
Originally Posted by wdecho View Post
I have thought about putting some chokes in my PS so this is good news. I did not think it would effect the sound too much is the reason I have not. Chokes are pretty common in Tube amps.

Nothing to settle in or break in. It's just coils of wire making an electromagnet. Being an electromagnet it does, as Zen says, have a field around it.
I have a pair that are currently not being used. If you're interested in experimenting, and would like to borrow them, let me know. - Pat
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Old 27th February 2016, 10:49 PM   #7
woody is online now woody
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Speaker City has some 2 mh 6A close out chokes for $6.95 each plus shipping . Probably not enough current rating for a stereo F5 but might be fine for monoblocks. Another down
side to these cheep chokes is they are unbelievably ugly !
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Old 28th February 2016, 12:18 AM   #8
wdecho is offline wdecho  United States
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Originally Posted by tubesguy View Post
I have a pair that are currently not being used. If you're interested in experimenting, and would like to borrow them, let me know. - Pat
Thanks for the offer. I am starting on another tube amp next week so I am going to be busy with it. As for a good reasonable priced choke, I have used these extensively in tube builds with good results even when 10hy was specified.

C-14X Triad Magnetics | Mouser
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Old 28th February 2016, 01:14 AM   #9
mcandmar is offline mcandmar
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Hammond and Triad both have a good selection of chokes for tube use..

Hammond Mfg. - D.C. Filter Chokes - (153 - 159 Series)
Hammond Mfg. - D.C. Filter Chokes - Enclosed & Potted Versions (193 Series)
Low Frequency (Inductor) Chokes On Triad Magnetics
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Old 28th February 2016, 10:51 AM   #10
eduard is offline eduard  Netherlands
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Default lundahl filament chokes

Hello,
In the past i had the a modified Hiraga 30 watt amp which used the chokes developped for another amp designed by the French team.
The french choke was 200mH, 2,5A and 0,8 ohm. I dasked the shop in Paris if i could use the choke in my Hiraga and they said sure!
Now there are some lundahl filament chokes that could be used in some solid state amp designs but nobody seems to try it!!
With the lundahl which has 2 windings you only need one choke. Per Lundahl did assure me if the current in the negative and positive lead are equal current the Lundahl can be used.
Because the ac voltage across the choke is low the current going through the choke can be much higher. See the following link.
Lundahl Plate chokes, Lundhal Anodendrossel
There is one more '' dealer '' in Germany who sells Lundahl chokes with reduced mH but extra current capability if i am right.
People should not worry to much about ohmic value of the choke.
So far i only see people using very low mH chokes. I would like to encourage people to try a filament choke in their Pass or other class A amps.
Greetings, Edward
 

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