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Tube loading chokes?

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Posted on February 5, 2021 at 13:03:22
Gordon Rankin
Manufacturer

Posts: 2889
Joined: June 9, 2000
All,

Since Mike @ MagneQuest is no longer making loading chokes or anything for that matter. I was wondering if any other companies are making these as I am a little stuck for some product ideas I have.

100H/10ma
220H/10ma

Thanks,
Gordon
J. Gordon Rankin

 

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RE: Tube loading chokes?, posted on February 5, 2021 at 15:54:33
sideliner
Audiophile

Posts: 186
Location: NYC
Joined: August 22, 2013
One Electron PRC-3

15mA/225H

DCR: 1850 Ohms

From the product's literature:

"The PRC-3 choke was originally designed to be driven by a 5687 triode, but other low to medium-mu triodes, such as 6J5, 6BL7GT, 6S4, 6SN7GT, 12B4, 7044, or 7119, will work well, as will most triode-connected output pentodes, such as 6AQ5, 6BF5, 6BQ5/EL84, 6CW5/EL86, 6V6GT, 6W6GT, or 6Y6G."

 

RE: Tube loading chokes?, posted on February 6, 2021 at 03:43:15
Boli46
Audiophile

Posts: 62
Location: Uppsala
Joined: March 6, 2015
Electra Print AC9037 100H/10mA

 

Was gonna suggest Jack..., posted on February 6, 2021 at 05:51:34
Ivan303
Audiophile

Posts: 41916
Location: Cadiere d'azur FRANCE - Santa Fe, NM
Joined: February 26, 2001
He does custom stuff, in fact did all of Welborne's iron back in the day, IIRC, and Ron's better stuff sounded good.

Plus, a phone call to Jack always brightens up ones day!








 

Heyboer, posted on February 6, 2021 at 06:59:41
Posts: 874
Joined: June 16, 2006
They will build just about anything.

Cal

 

NP Acoustics, Vietnam, posted on February 6, 2021 at 10:10:34
andy evans
Audiophile

Posts: 3869
Joined: October 20, 2000
I assume you want plate chokes? I wasn't quite clear about your wording.

I have some amorphous core plate chokes from NP Acoustics in Vietnam. I like them a lot. Very nice guy builds them and is open to ideas. They were not to expensive - mainly the shipping. I had 2 types:
- 180H at 40mA
- 136H at 15mA

I'm sure he'd build whatever you need to order.

 

RE: NP Acoustics, Vietnam, posted on February 7, 2021 at 10:42:28
Gordon Rankin
Manufacturer

Posts: 2889
Joined: June 9, 2000
Thanks, Yes plate chokes, I will check them out.
Gordon
J. Gordon Rankin

 

RE: Heyboer, posted on February 7, 2021 at 10:44:05
Gordon Rankin
Manufacturer

Posts: 2889
Joined: June 9, 2000
Thanks, Heyboer is really busy since Classic Tone went out of biz. They are making a power transformer for me now. But since Classic Tone and the increase in what Mojo is asking for it's hard to get anything out of them.
Thanks,
Gordon
J. Gordon Rankin

 

RE: Tube loading chokes?, posted on February 7, 2021 at 12:15:31
kobasa@xs4all.nl
Audiophile

Posts: 219
Joined: August 21, 2018
''

The Mind has No Firewall~ U.S. Army War College


ality amp.

 

RE: Tube loading chokes?, posted on February 7, 2021 at 12:38:11
Paul Joppa
Industry Professional

Posts: 7042
Location: Seattle, WA
Joined: April 23, 2001
The normalized parameter is L/R and this choke is in the normal range. The maximum DC voltage drop is 27v, about the same as the Hammond 156C (150H, 8mA, 3700 ohms) or Magnequest BCP-15 (50H, 40mA, 40mA IIRC)

 

RE: Tube loading chokes?, posted on February 7, 2021 at 13:05:24
kobasa@xs4all.nl
Audiophile

Posts: 219
Joined: August 21, 2018
'The Mind has No Firewall~ U.S. Army War College

 

RE: Tube loading chokes?, posted on February 7, 2021 at 22:26:19
Paul Joppa
Industry Professional

Posts: 7042
Location: Seattle, WA
Joined: April 23, 2001
By "normal range" I mean typical of the plate chokes I have measured or seen measurements of.

Windings are interesting. The L/R ratio is a function of the core and gap, but any winding of the same copper mass will have the same L/R. So if you have 225 henries at 1850 ohms, you could use thicker wire on the same core and get 22.5 henries at 185 ohms. (That's a 3.5 pound choke, in the Hammond catalog.)

If you do layer winding, the self-capacitance is mostly between adjacent layers, and they are in series. More layers, less capacitance. Of course there is winding to core capacitance too, and it may dominate since it's in parallel. But many turns is not necessarily a capacitance problem.

 

RE: Tube loading chokes?, posted on February 8, 2021 at 00:36:04
kobasa@xs4all.nl
Audiophile

Posts: 219
Joined: August 21, 2018
The Mind has No Firewall~ U.S. Army War College ber.

 

RE: Tube loading chokes?, posted on February 8, 2021 at 12:34:57
Triode_Kingdom
Audiophile

Posts: 8404
Location: Texas
Joined: September 24, 2006
I picked up a bunch of chokes 70H @ 2.3K not long ago. The response is extremely flat, no unwanted responses, and they've proven to be excellent for this use. The DCR is absolutely not an issue.








--------------------------
Buy Chinese. Bury freedom.

 

RE: Tube loading chokes?, posted on February 8, 2021 at 12:51:30
kobasa@xs4all.nl
Audiophile

Posts: 219
Joined: August 21, 2018
The Mind has No Firewall~ U.S. Army War College

 

RE: Mojo, posted on February 10, 2021 at 10:31:15
deafbykhorns
Audiophile

Posts: 982
Location: Florida
Joined: October 17, 2003
Took Mojo 8 weeks to get me just parts for a kit.....

 

RE: Mojo, posted on February 10, 2021 at 11:15:07
Gordon Rankin
Manufacturer

Posts: 2889
Joined: June 9, 2000
Yep they are pretty strapped right now. Mojo won a couple of awards for their Black Out series amps and that has swamped them. Plus covid isn't helping either.

Thanks,
Gordon
J. Gordon Rankin

 

RE: Tube loading chokes, posted on February 10, 2021 at 11:50:26
Posts: 874
Joined: June 16, 2006
Have you ever done any business with pacific transformer?
I bought some power supply chokes from a fellow on eBay that had been
custom made by this company, they seem to be well made chokes.

Anyways they are still in business and their website says they do custom work,
no job too big or small. Might be worth a call.

Cal

 

SE Asia Nano core winders, posted on February 11, 2021 at 14:11:57
Deke609
Audiophile

Posts: 17
Location: Toronto
Joined: January 11, 2019
Contributor
  Since:
December 0, 0000
will wind you anything you want.
Derek

 

RE: SE Asia Nano core winders, posted on February 11, 2021 at 14:23:53
Gordon Rankin
Manufacturer

Posts: 2889
Joined: June 9, 2000
Website?
Thanks G.
J. Gordon Rankin

 

Monolith Magnetics ..., posted on February 11, 2021 at 19:47:49
Deke609
Audiophile

Posts: 17
Location: Toronto
Joined: January 11, 2019
Contributor
  Since:
December 0, 0000
Apologies - the subject line I typed was "Monolith Magnetics", but for some reason one of the apps I use (I think it's LastPass or my VPN) doesn't play nicely with the AA messaging interface and will replace my subject line with some previous stored one.

cheers, Derek


Derek

 

RE: This ^^^, posted on February 12, 2021 at 04:33:38
deafbykhorns
Audiophile

Posts: 982
Location: Florida
Joined: October 17, 2003
I have a custom SA-15 for my GM-70 (higher impedance for 1200v) and a IT-01 interstage (gapped for 50ma).
I started out with some Hammond iron, the difference was night and day in terms of sound and measurements.

 

RE: Tube loading chokes?, posted on February 12, 2021 at 09:31:42
Triode_Kingdom
Audiophile

Posts: 8404
Location: Texas
Joined: September 24, 2006
I used several types in actual testing, but you can calculate or simulate the same. My point was that huge inductance and extremely low DCR aren't required in order to achieve good performance. That's based on the use of relatively low-Rp tubes of course, not something like a 12AX7. :)





--------------------------
Buy Chinese. Bury freedom.

 

J&K Audio Design, posted on February 12, 2021 at 13:03:37
91derlust
Audiophile

Posts: 976
Joined: December 25, 2014
I've had good results from J&K Audio Design. Not the best site - they are very responsive to email and happy to work through custom designs with you, if that is what is needed.

They also have a Facebook group, if that is your thing.

Cheers.
"Confusion of goals and perfection of means seems to characterise our age." Albert Einstein

 

RE: Tube loading chokes?, posted on February 13, 2021 at 11:21:48
kobasa@xs4all.nl
Audiophile

Posts: 219
Joined: August 21, 2018
The Mind has No Firewall~ U.S. Army War College

 

RE: Tube loading chokes?, posted on February 17, 2021 at 21:13:37
sser2
Audiophile

Posts: 2352
Location: Pittsburgh USA
Joined: July 30, 2003
This is not true. Turn-to-turn capacitance dominates, not layer-to-layer.

 

RE: Tube loading chokes?, posted on February 22, 2021 at 12:16:13
kobasa@xs4all.nl
Audiophile

Posts: 219
Joined: August 21, 2018
?

 

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