Re: bad bottlecap transistors causing squiggly vectors?

I think Generally speaking it's also a good idea to used matched pairs on
your push pulls too. But since buying MP's are not always convenient, and
not everyone has a curve tracer to try and match them. I'd have to agree
with Mark though. I doubt that would be your problem. They would/could cause
other issues. For example, Walling on Tempest.

Kevin

On Thu, Jul 29, 2010 at 10:48 AM, Mark Shostak <shostakmark@gmail.com>wrote:

> Uh, kind of obvious, but you could put the original TO-3 transistors back
> in, and see if the problem goes away. If you're like many of us, the parts
> are still on the bench...
>
> However, IMHO it's unlikely that it's the transistors causing the issue,
> assuming you replaced them with the original devices and not subs.
>
> Also, rule of thumb in push-pull is to replace _both_ outputs at the same
> time, and also to replace both drivers when replacing the outputs. This rule
> primarily pertains to repairs after a failure and not to, "it ain't broke,
> but I'm fixing it anyway" type activity.
>
> -Mark
>
>
>
> On Thu, Jul 29, 2010 at 10:37 AM, Pat Danis <patdanis@verizon.net> wrote:
>
>> I too had noticed that some of my WG 6100s were not as sharp after
>> replacing all the transistors and doing a complete rebuild of all the
>> components. The lines were a little wavy and not completely straight. I
>> suspected that perhaps the bottlecap trannies might be an issue but don't
>> have the smarts necessary to make a determination if it was the transistors
>> or something else I might have replaced during the rebuild. I am going to
>> track my findings in some 6100 rebuilds I will be doing in the next few
>> weeks to see if there is a correlation to the transistors I am using. I
>> have 2 different sources for the present time.
>>
>> I will see if there is any visible difference between original, and the 2
>> sets of replacements transistors after a rebuild. My month of August is
>> pretty booked up right now but I need to get some 6100s done so I will
>> attempt to get this info posted. I'll even take video if possible. No
>> guarantees.
>>
>> Pat Danis
>>
>>
>> PJ wrote:
>>
>> 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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>
>
>

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Received on Thu Jul 29 12:48:12 2010