Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Spark plug wire for tubes with a top cap?
Spark plug wire for tubes with a top cap?
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 16th September 2020, 05:17 AM   #21
H713 is offline H713  United States
diyAudio Member
 
H713's Avatar
 
Join Date: Nov 2017
Location: Wisconsin
Another option would be to use some coax with a PE (NOT FOAM) dielectric. Something like RG-58 would be a nice size. If you ground the shield, then you have some shielding (that may or may not matter) and an additional safety feature. Otherwise, strip the outer jacket and the shield off and use the inner conductor and dielectric as HV wire. Not sure about RG-58, but RG-213 with a solid PE dielectric can take something like 60 kV without arcing over. I think it's rated for like 10 or 20 kV, but lots of companies use it for HV power supplies.
  Reply With Quote
Old 16th September 2020, 05:17 AM   #22
JMFahey is offline JMFahey  Argentina
diyAudio Member
 
JMFahey's Avatar
 
Join Date: Mar 2009
Location: Buenos Aires - Argentina
Quote:
Originally Posted by jjasniew View Post
Perhaps if the tube is running class A, the copper oxide micro diodes wont matter much...
Perhaps
Mythical copper microdiodes will do NOTHING to sound, even if they exist, because each and every one of them will be surrounded by ... um .... "copper", so it ill be shorted anyway.
__________________
Design/make/service musical stuff in Buenos Aires, Argentina, since 1969.
  Reply With Quote
Old 16th September 2020, 08:24 AM   #23
6A3sUMMER is offline 6A3sUMMER  United States
diyAudio Member
 
Join Date: Jun 2016
600V wire? No!

An 807 plate @ 350V may swing up to 700V (or more).

Just sayin'
  Reply With Quote
Old 16th September 2020, 08:46 AM   #24
kostasde is offline kostasde
diyAudio Member
 
Join Date: May 2010
You may use a high voltage cable from neon tubes. It is silicone with more than 20 kilovolts and is flexible
  Reply With Quote
Old 16th September 2020, 11:33 AM   #25
mondogenerator is offline mondogenerator  England
diyAudio Member
 
mondogenerator's Avatar
 
Join Date: Sep 2009
Location: North Warwickshire
Quote:
Originally Posted by 6A3sUMMER View Post
600V wire? No!

An 807 plate @ 350V may swing up to 700V (or more).

Just sayin'
It's close to being over spec but: 600VAC cable is rated to 1000V DC (or Peak) (at least here 600V AC cable is rated 600V/1000V and US spec "Tri-rated" is similar IIRC.

CAT III DMM cable, also silicone, also the same story 600VAC/1000V DC or peak.

That being said, I have experienced insulation 'leakage" with CATIII wires and probes when measuring 550V DC + half wave rectification garbage, sparking probe tips at 100Hz!

So with that in mind, a "belt and braces" approach is always worth it. (Just not 10kV magnetoflex or anything carbon based, unless you are planning to heat the cable enough so that its resistance becomes acceptable)
__________________
We don't rise to the level of our expectations, we fall to the level of our training
Archilochus
  Reply With Quote
Old 16th September 2020, 12:01 PM   #26
gerrittube is offline gerrittube  Netherlands
diyAudio Member
 
Join Date: Jan 2018
Location: Holten
Solid PE innercable of RG213 is fine for high voltage. RG213 with the copper shield started buzzing with 9KV in one of my PSU’s many years ago, but never burned or sparked. I also made small high frequency capacitors, using 5 to 10 cm of RG213. These were OK for very high RF voltages (it’s hard to find a ceramic alternative). For voltages below 1000 VDC I would recommend the PE innercable of RG58.

Regards, Gerrit
  Reply With Quote
Old 16th September 2020, 03:04 PM   #27
Windcrest77 is offline Windcrest77  United States
diyAudio Member
 
Join Date: Feb 2019
Location: Lockport, IL USA
There must be a high voltage project fad amongst nerdy tech hobbyists these days, 10, 20 and 30 kV silicone wire is very cheap and plentiful on Amazon. Depending on the hole size on my top caps I'll probably get a few rolls of different diameters of this. Around .50 cents a foot.

My earlier post had a link.
  Reply With Quote
Old 17th September 2020, 01:06 AM   #28
PRR is offline PRR  United States
diyAudio Member
 
PRR's Avatar
 
Join Date: Jun 2003
Location: Maine USA
Spark plug wire for tubes with a top cap?
Quote:
Originally Posted by 6A3sUMMER View Post
600V wire? No! An 807 plate @ 350V may swing up to 700V (or more). Just sayin'
A coat of paint will stop 300V. "Any" plastic will stand more, SHORT-term.

Insulation breakdown is really a gradual thing (unless you go crazy with voltage). All insulators WILL break down, some day. Faster with more voltage. "600V" wire is good for appliance or building for decades. If you use it in a 400V amplifier, it will last longer than you, even if it kicks to 800V on musical peaks. And Hi-Fi does not kick that high ALL the time. (Even overdrive guitarists take breaks.)
  Reply With Quote
Old 17th September 2020, 06:49 AM   #29
6A3sUMMER is offline 6A3sUMMER  United States
diyAudio Member
 
Join Date: Jun 2016
I am never sure of insulation.

Example, I will not wrap my hand around an active spark plug wire.
I do not want to test the insulation.
But even more than that, I do not want to test the action of the capacitive reactance as it charges up during a very fast rise transient.

How many have ever tried that?
  Reply With Quote
Old 17th September 2020, 07:08 AM   #30
lcsaszar is offline lcsaszar  Hungary
diyAudio Member
 
Join Date: Mar 2004
Location: Budapest, Hungary
One has to consider aging, too. Plastic insulators can become rigid and brittle after the plasticizer components evaporate after a couple of years. Heat and UV radiation will speed up this process. If you bend such cable, there will be cracks on it, and the conductor will be exposed.
Silicone is an exception, and teflon also (I think). I use a teflon insulated silver plated copper wire, pulled in a transparent teflon tube.
  Reply With Quote

Reply


Spark plug wire for tubes with a top cap?Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Are 6L6 Metal tubes plug and play Duke58 Tubes / Valves 11 18th September 2020 11:42 PM
Polarize plug, 3 wire or keep as is Tommyboy60 Tubes / Valves 17 3rd June 2020 12:07 PM
FS: Dynaco ST70, RUby EL34 tubes, Biased, Plug&Play baco99 Swap Meet 2 10th May 2018 10:23 PM
240/300 Ohms balanced IEC FM-Plug for flat Dipole Wire and for Disass'y e. g.Quad FM3 tiefbassuebertr Analogue Source 13 4th July 2014 08:56 PM
Good wire and plug for DIY power cord lovemov Parts 0 19th December 2003 07:14 PM


New To Site? Need Help?

All times are GMT. The time now is 01:58 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki