Your advice is good. I bought a used 262M and put in the crowbar circuit.
When I first bought the supply, the pass transistor was gone. Had I hooked
it up to a radio, it would have killed it. The few dollars for the crowbar
circuit is well worth it.
73, Winston K4CWQ
----- Original Message -----
From: Ken Graham <k5id@ipa.net>
To: <tentec@contesting.com>
Sent: Tuesday, April 11, 2000 05:32 AM
Subject: [TenTec] Caution: 262m Pwr Sppy
>
> Here's an item which we all probably know about, but can bite you:
>
> I have an old TT 262m power supply which I have had many years, and have
> continued to use it on a variety of TT rigs. Recently I acquired a
beautiful
> little Delta rig, and confidently hooked it up to the 262 ps. The unit
> worked fine for a while as I checked alignment in the rig. Then all of a
> sudden the pass xsister let go, swamping the Delta with about 24 volt dc
> bulk voltage. That's right (as I already knew) there is no crowbar
circuit
> in that old supply. Many things were damaged in the Delta (Thank
goodness
> for GREAT TT service). But the experience cost me $175 bucks -counting
> shipping- and took the Delta out of service for a couple weeks......
>
> Keep this in mind whenever you press those older TT power supplies
> into service. Yes, I will keep the 262m, but I will add a crowbar circuit
> to it before using it again!!
>
> Ken K5ID
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