|[AMRadio] Seeking advice on testing modulation transformers|
w3slk at uplink.net
Wed Sep 20 19:12:40 EDT 2006
I have found that the best way to check a transformer is to use a HI Pot
tester or an insulation tester like a megger with about 5kv capability. I'm
fortunate to have access to a 5KV jobber at work. Anything less than 500K
ohms would be suspect.
You could go to Rich Measures webpage. I believe he has a neat schematic for
HI pot testing tubes which would accomplish the same thing.
----- Original Message -----
From: "Mark Foltarz" <Foltarz at rocketmail.com>
To: <amradio at mailman.qth.net>
Sent: Wednesday, September 20, 2006 6:53 PM
Subject: [AMRadio] Seeking advice on testing modulation transformers
I am sure the following has happened to all of us.
You build a transmitter or modulator using a transformer that you have had
around for years.
You then apply power only to find a short to case or worse on the
Well, I would like to avoid that with several chunks o' iron I have here.
Specifically, I have the big Thordarson multimatch, a pair of those RCA
: 5500 surplus units, and a mod transformer from a BC610E.
I was thinking of applying power between case and a terminal and looking
In the past I have even run a mod transformer with a case leakage on a
phenolic with favorable results.
By the way, does anyone have any experience using the RCA 5500 5500
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