Re: Two Ampliphone HV problem questions

On 02/15/2014 10:11 PM, David Shoemaker wrote:
>
> 1:
>
> HVT with a cinelabs HV unit installed.
>
> Good +/- 24 V
>
> Good crackle / HV.
>
> No neck glow, testing the heater voltage at the back of the board I am
> getting ~ 13.0v AC. Roughly double what I would expect. This tube
> was working fine with the last HV I worked on but I don't have a known
> good at the moment to verify something didn't go bad there. I did
> continuity test the tube heater pins and that seems fine.
>
> 2:
>
> HVT with a Red transformer (yea I know, red = dead).
>
> I don't have a ringer handy to test it with.
>
> Good -24
>
> Bad +24 (reads around +12), I pulled the 406D out and retested, the
> +24 was there.
>
> Putting the 406D back in and replaced the LM7824, no change.
>
> Suggestions?
>
> Thanks,
>
> David
>
For $49.95 you can get a nice Bob Parker ringer...

http://www.flippers.com/catalog/product_info.php/blue-flybacklopt-ring-tester-p-19

Sorry folks, I couldn't resist! Bob designed two very nice pieces of
test equipement and he is a nice guy too!

John :-#)#

-- 
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
                  www.flippers.com
"Old pinballers never die, they just flip out"
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