I believe the 252/262 models were the last without OVP. You were wise to
avoid using the older supply with no OVP protection. With an older supply,
look inside for a small circuit board which connects directly to the rear
panel output socket's positive lead - if present, the OVP is installed.
Those shown at http://www.qsl.net/tentec/ttps.htm listed as the following:
255, 260, 280, 936, 960, 961 & 962, and any current model 20+ amp Ten-Tec
supply are safe.
73, Mike N4NT
----- Original Message -----
From: "Hulett, Russell" <rhulett1@consolidated.net>
To: <tentec@contesting.com>
Sent: Friday, September 03, 2010 7:53 AM
Subject: [TenTec] Ten Tec Power Supplies
>I owned a TT PS for awhile, but it had a single pass transistor without the
>OVP module ( crowbar ), so fear of putting 25 VDC into the rig from a
>30-year old transistor failing caused me to never use the thing. For
>awhile I contemplated building a crowbar, but ended up selling the PS, now
>use a switching supply with meters and just keep the current levels below
>the danger point.
>
> When did Ten-Tec start incorporating OVP ( and/or dual pass
> transistors )into their power supplies? Which models are "safe" from the
> destroying the powered device because of single-component failure? So
> far, I've avoided buying any TT power supplies because am never sure which
> of them are "safe".
>
> 73, Curt KB5JO
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