[TenTec] Titan 425 Works Fine but Started Blowing Fuses

[Joe Giacobello]

I have heard from the previous owner of my 425 that if the final tubes 
are not securely seated in their sockets, it can cause serious problems 
similar to what you're describing.  If you haven't, you ought to take a 
look.

73, Joe

GARY HUBER wrote:

>One thing to look for on amps with external anode tubes is a lite coat of dirt on the tube "seal" providing an arc path between the HV anode (PLATE) and the chassis / tube socket ground. Used to see it a lot in MLA 2500s.....
>
>Best regards,
>Gary - AB9M
>CSM(r)G.L.Huber
>glhuber at msn.com<mailto:glhuber at msn.com>
>www.csm-gh.com<http://www.csm-gh.com/>
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>  ----- Original Message ----- 
>  From: Jim Brown<mailto:jim at audiosystemsgroup.com> 
>  To: Ten Tec List<mailto:tentec at contesting.com> 
>  Sent: Wednesday, January 19, 2005 9:25 AM
>  Subject: [TenTec] Titan 425 Works Fine but Started Blowing Fuses
>
>
>  My vintage 425 just started blowing one of the main 20A fuses for no 
>  obvious reason. Yesterday, it had been idling (not in transmit mode) 
>  for at least 10 hours and popped the fuse. I didn't realize what had 
>  happened until I heard the fan quit.  I didn't have time to check it 
>  out until last night, when I replaced the fuse and fired it up. No 
>  obvious problem, and I ran it for a while, then shut it down for the 
>  night. This morning I fired it up again, called a half dozen CQ's on 
>  80 at about 1 kW out (roughly 600 mA plate current, low grid 
>  current) and 1:1 SWR, and it popped the fuse again. 
>
>  The tubes are some "pulls" I bought and installed about 3 months 
>  ago, and seem fine. No audible arcing. 
>
>  Any ideas what to look for?  
>
>
>  Jim Brown  K9YC
>
>
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