Re: G05 deflection board power transistors

The NTE book doesn't even show a cross for a 2N5786. Their web site says an
NTE2347 will work. An NTE2347 is an NPN, but the 2N3792 it was used to replace
is a PNP. You probably have blown parts in the driver stage now. You need to
get rid of the 2N5786 and repair the drivers BEFORE installing a good output
pair.

There is a chance you read that part number wrong. The replacement isn't in
anything close to a TO3 case style (what the chassis mount transistors are).
It wouldn't be possible to mount one of these.

Harry Collins wrote:

> I'm trying to get a G05 deflection board working. I have narrowed down the
> problem to the 4 power transistors, the 2N3716s & 2N3792s.
>
> On my deflection board the push-pull arrangement is made by 2N3716 paired
> with a 2N5786 (note a 2N3792). One set of amplifiers is fried.
>
> My replacement is to use NTE284 & NTE285, which does not work. If I then
> pair these transistors with the existing 2N3716/2N5786 that work, I get
> enough amplification to see something on the display (i.e. the spot killer
> doesn't kick in).
>
> So what's the deal? I would think that the NTE284 is interchangeable with
> the 2N3716, but when paired with a 2N5786 it is not.
>
> /harry
>
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