- Need advice on a neon transformer - 11 Updates
- 1988 Fender Princeton Chorus amp - 4 Updates
- WTB: Panasonic KXT-8000 Phone Answering Machine - 2 Updates
| John Robertson <spam@flippers.com>: Jul 24 09:43AM -0700 On 2020/07/24 9:27 a.m., Brian Struckmeier wrote: > I have new neon sign with a bad transformer (has a short and works sporadically), it is a 5kv 15MA transformer. I bought a new one that is 5kv 30ma and the neon fades towards the end of the run. It is nice and bright the whole run with the original transformer so I am assuming the 30ma vs 15ma is a problem. > Any advice, im having a hard time finding a 5kv 15ma replacement. 30ma is more available power, so it is better - the transformer will handle a larger load. Your transformer may not be putting out 5KV though... This is where an AC/DC HV probe is handy. You can get 10:1 on eBay and other sources. Look for ones that appear to be well insulated! If it comes from China don't stand on a cement floor when using it! John :-#)# |
| adrian@poppyrecords.invalid.invalid (Adrian Tuddenham): Jul 24 06:36PM +0100 > bright the whole run with the original transformer so I am assuming the > 30ma vs 15ma is a problem. > Any advice, im having a hard time finding a 5kv 15ma replacement. The extra current may be damaging the electrodes and causing out-gassing or overheating the tube so the neon pressure rises. Is there a possibility that there is an adjustable magnetic shunt inside the transformer that could be adjusted to reduce the current? Please be careful - with those sorts of currents and voltages, your first mistake could well be your last. -- ~ Adrian Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk |
| John Robertson <spam@flippers.com>: Jul 24 11:20AM -0700 On 2020/07/24 10:36 a.m., Adrian Tuddenham wrote: > transformer that could be adjusted to reduce the current? > Please be careful - with those sorts of currents and voltages, your > first mistake could well be your last. Interesting, I did not realize that Neon transformers were current limiting, behaving somewhat like a ballast on fluorescent lamps: https://www.richieburnett.co.uk/ballast.html --------------(quote)--------------------------------------- Neon sign transformers have built-in magnetic shunts which give current limiting. In its intended use as a supply for neon tube, the high open circuit voltage of the transformer is used to strike an arc in the neon tube. Once an arc has formed inside the neon tube, the current must be limited to prevent overheating of the neon tube and the transformer due to excessive current flow. (The hotter the arc gets, the more current flows, so it gets hotter etc…) ----------------(end quote)---------------------------------- Thanks for the info! Live and learn, eh? John :-#)# -- (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3 (604)872-5757 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
| Mike Coon <gravity@mjcoon.plus.com>: Jul 24 07:29PM +0100 In article <iPKdnZakvr_wu4bCnZ2dnUU7-LfNnZ2d@giganews.com>, spam@flippers.com says... > ----------------(end quote)---------------------------------- > Thanks for the info! Live and learn, eh? > John :-#)# Exactly like a grown-up version of your tiny neon pilot lamp in an AC power socket with its ballast resistor... Mike. |
| Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>: Jul 24 03:42PM -0400 On 2020-07-24 14:20, John Robertson wrote: > ----------------(end quote)---------------------------------- > Thanks for the info! Live and learn, eh? > John :-#)# HeNe laser supplies are the same way. You have to match them to the tube. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com |
| John Robertson <spam@flippers.com>: Jul 24 03:10PM -0700 On 2020/07/24 11:29 a.m., Mike Coon wrote: > Exactly like a grown-up version of your tiny neon pilot lamp in an AC > power socket with its ballast resistor... > Mike. I have a Neon Christmas tree (glass tube outline) that was made for my grandfather by his employees (E.L. Ruddy in Toronto) during the depression (as Granny told me years ago). Stands about 14 inches tall and is still working just fine. Haul it out every winter and plug it into its base. I can post a picture if anyone is interested... John :-#)# -- (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3 (604)872-5757 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
| John-Del <ohger1s@gmail.com>: Jul 24 06:53PM -0700 On Friday, July 24, 2020 at 6:10:37 PM UTC-4, John Robertson wrote: > into its base. > I can post a picture if anyone is interested... > John :-#)# I certainly wouldn't mind seeing it John. |
| John Robertson <spam@flippers.com>: Jul 24 07:56PM -0700 On 2020/07/24 6:53 p.m., John-Del wrote: >> I can post a picture if anyone is interested... >> John :-#)# > I certainly wouldn't mind seeing it John. https://flippers.com/images/XmasNeonSmokey.JPG https://flippers.com/images/XmasNeonTree.JPG Old photos, that don't show the metal base. All I have at the moment. It is sitting on a 1929ish RCA radio, sitting on a 1920s radio speaker cabinet. Photos taken almost twenty years ago. John :-#)# |
| Mike Coon <gravity@mjcoon.plus.com>: Jul 25 12:34PM +0100 In article <w7ednSQeHN_6AobCnZ2dnUU7-f_NnZ2d@giganews.com>, spam@flippers.com says... > >> I have a Neon Christmas tree (glass tube outline) that was made for my > It is sitting on a 1929ish RCA radio, sitting on a 1920s radio speaker > cabinet. Photos taken almost twenty years ago. > John :-#)# How refreshing that the shape has an smidgen of randomness! Mike. |
| Bob Engelhardt <BobEngelhardt@comcast.net>: Jul 25 08:04AM -0400 On 7/25/2020 7:34 AM, Mike Coon wrote: > How refreshing that the shape has an smidgen of randomness! > Mike. My thoughts exactly. 'Twere mine, I would put it up every year too. To remember grandpa and because it's cool. |
| John Robertson <spam@flippers.com>: Jul 25 09:32AM -0700 On 2020/07/25 5:04 a.m., Bob Engelhardt wrote: > My thoughts exactly. > 'Twere mine, I would put it up every year too. To remember grandpa and > because it's cool. Exactly. It goes up every year for a month or so... Thanks, John :-#)# |
| Jeff Urban <jurb6006@gmail.com>: Jul 24 06:57PM -0700 First of all Phil is probably right. But then if you want to try things on your own... The chips you mentioned are probably the clock and BBD. They really should not affect the level of sound. Turn the chorus off and see if you are getting the same volume out of each speaker. If the sound is equal then you need to go right after the BBD circuit. If not it could be in the amp on that side anywhere. |
| Jeff Urban <jurb6006@gmail.com>: Jul 24 07:15PM -0700 There is an OP AMP right after the BBD, it is set to unity gain. If you have a scope, it should be putting out the same amplitude as what is going in. It is nice to have a generator working in those things but you have to usually resistor the output way down. Where I worked I had a guitar next to me, plugged it in and had to strum it periodically. My stuff stays home now. That print says for a power/gain test go in the return loop jack and you should have equal signal on both sides. You can plug a friggin cassette deck into it really. (one channel) All you have to do is get or make the proper adapter. |
| Phil Allison <pallison49@gmail.com>: Jul 24 09:32PM -0700 Jeff Urban wrote: ============================ > First of all Phil is probably right. ** You bet he is... > But then if you want to try things on your own... ** He might start with the Chorus/ straight switching system. In Chorus mode, one channel handles straight signal while the other the delayed/swept version. Mixing of the two to give the effect occurs in the air beyond the speakers. If the either channel's level is low, he may still think both speakers are workings when one is not. I use a scope to tell, the delayed signal sounds almost normal until the straight one is added. ..... Phil |
| Jeff Urban <jurb6006@gmail.com>: Jul 25 02:51AM -0700 Well like you said but in different words, this takes a tech. One speaker could be half blown. And in a guitar amp post people would not notice much if the amp is only pushing one direction. I say let the guy do it. I think he owns it. If it goes poof then it does. Maybe the guy will buy a scope. I think novices should always start with a CRO, not a raster based one. No digital no nothing. That would ell of the speakers. They both had the same power but one (the right one I think right ?) is half fucked up because maybe something got spilled in it. Shit happens. Well if out OPer here is reading he is probably learning. One of the simplest tests would be to switch the speakers. However we know that is not always feasible. You got two viable choices, mount them reverse. Or just hook it to external speakers. We all have a pair of speakers around. So without a scope he is not even to that point yet, needs a pair. |
| tdt.algarve@gmail.com: Jul 24 09:52AM -0700 quarta-feira, 18 de Junho de 1997 às 08:00:00 UTC+1, John Hinrichs escreveu: > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > email: hinrichs@artswire.org nextwave@compuserve.com > voice: +1 213 957 1769 fax: +1 213 962 6710 Hello. Still want the phone? |
| Eli the Bearded <*@eli.users.panix.com>: Jul 24 06:20PM > quarta-feira, 18 de Junho de 1997 às 08:00:00 UTC+1, John Hinrichs escreveu: ^^^^^^^^^^^^^^^^^^^ >> Would like to buy a Panasonic KXT-8000 Phone Answering Machine. > Hello. Still want the phone? Twenty three years later. What do you think? Elijah ------ "John Hinrichs obituary" returns a lot of search results |
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