bad bottlecap transistors causing squiggly vectors?

I was looking over Darren Finck's post regarding issues with a G05-802 having amongst a number of things, squiggly vectors. This tweaks my memory of the issues I had with an Amplifone that had a bad case of twisted distorted vectors on certain objects (see my starwars posts from last spring). I also had a similar issue on a G05 with original transistors that I figured were getting tired, and once replaced, the issue went away.

The Amplifone in question had new transistor pairs on both channels. Since the original transistor pairs were long replaced prior to my involvement with whatever transistor the previous owner had on hand (literally), I replaced them with the correct parts, and from evidently, the same batch that I used in the G05.

What I ended up with was when the drive from the game board was normal, and the gains on the deflection were set higher to fill the screen, the vectors were distorted, like the start and stop rates were bad. Tweaking the drive from the game board to a high level, and dropping the gains on the deflection board made the effect less evident.

I'm wondering if the 2N3716s and 2N3792s have changed or the specifications aren't what they once were. Anyone else seen this?

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Received on Thu Jul 29 03:43:19 2010