Re: Two Ampliphone HV problem questions

I'll vouch for the Bob Parker ringer...I've got my $49.95 back x 20 on this, definitely recommended...

-----Original Message-----
From: John Robertson <pinball@telus.net>
To: vectorlist <vectorlist@vectorlist.org>
Sent: Sun, Feb 16, 2014 1:57 am
Subject: Re: VECTOR: 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 :-#)#
    
    
    

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