A little late now but a good tip th
Sent from Mail for Windows 10
From: Glenn Little
Sent: Thursday, March 21, 2019 9:02 PM
To:
[email protected]Subject: Re: [TekScopes] 475 with no Display and no HV
Ensure that the silicon sealer does NOT cure with acetic acid.
Use silicone sealer that cures with alcohol.
If it smells like vinegar do not use it on electronics.
Glenn
On 3/21/2019 7:05 PM, SuddenLink wrote:
Good to know. Right now I need to locate a .01uF cap with 5kv or better voltage rating. All that I have in stock only go up to 1kv. I am at the Radio Museum tomorrow. Will see what we have there.
Ripley
The words are mine but this iPad does what it will with them.
On Mar 21, 2019, at 6:13 PM, Reed Dickinson <reed714@...> wrote:
Hi Ripley:
If your scope does not fire up when you have the .01uF cap between the transformer and the NTE539 tripler then the tripler may be blown as your last note implied you tried the tripler without the cap. The cap was present inside the original tripler but you could not see it as the original tripler was potted in Hysol. Try the .01uF cap, the tripler just possibly might still be good.
Reed
On 3/21/2019 4:37 AM, SuddenLink wrote:
Hello Reed,
Ahhh. A .01uF capacitor is the secret. The NTE539 sure doesn¡¯t work with a direct connection to the HV transformer¡¯s secondary. I will give it a try and report back.
Ripley
The words are mine but this iPad does what it will with them.
On Mar 21, 2019, at 12:50 AM, Reed Dickinson <reed714@...> wrote:
Hi Ripley:
You are correct, do not connect to the focus lead, a blob of silicon seal should work. You need to splice the cable going from the tripler to the socket. Slide a piece of shrink wrap tubing over a piece of thick wall plastic tubing over the wires to be spliced, make sure that you have a good lapping solder joint. After the joint cools look closely and be sure there are no sharp pieces of wire showing then generously coat the entire joint with silicon sealer and slide the large piece of tubing over the joint then slide the shrink tubing over the plastic tubing and heat the shrink tubing to seal it. If it is loose use two small tie wraps. Mount the mew tripler where the old tripler was by drilling two holes and install screws. Next connect the transformer output to the IN terminal using a .01uF, 5KV or 10KV cap. The cap must be used to make it work. Connect up and fire it up. Good luck!
Reed
On 3/17/2019 5:28 PM, SuddenLink wrote:
Hi Reed,
I received the NTE539 a few days ago and pulled out the existing HV trippler these evening. It is going to be a tight fit but it looks I can squeeze the new trippler in it¡¯s place. The question is, what do I do with the Focus tab on the NTE539. I am thinking that it gets clipped off and covered with a glob of silicon seal.
I am going to hold off until I hear back from you.
Thank you.
Ripley
Sent from Mail for Windows 10
From: Reed Dickinson
Sent: Tuesday, March 5, 2019 3:11 PM
To: [email protected]
Subject: Re: [TekScopes] 475 with no Display and no HV
Hi:
See answers in red below.
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Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIV wb4uiv@... AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI LM NRA LM SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
