[R-390] after all these years/ tube checker story, delete if not intetersted

[Les Locklear]

I have had tubes that failed the minimum test (not the shorts test) in my 
old TV-7 many times that worked just fine in the radio. Of course what 
circuit it is being used in makes a difference also. ymmv

As some of the older wiser gurus have said over the years, the best tubes 
tester many times is the receiver it is being used in.

Les Locklear
Gulfport, Ms.
DX'ing Since '57
http://www.hammarlund.info/





----- Original Message ----- 
From: "Scott Bauer" <odyslim at comcast.net>
To: "R-390 List" <r-390 at mailman.qth.net>
Sent: Tuesday, July 24, 2007 7:11 PM
Subject: [R-390] after all these years/ tube checker story,delete if not 
intetersted


> After all these years, I have finally found a bad tube that my TV-7
> passed.
>
> I had been running this radio for quite some time, about 4 months.
> When I came down into my radio kingdom, this radio was running
> but dead quiet. It is tuned up with 4 others to the Global HF System
> so I knew automatically there was something wrong. The others were
> receiving traffic. The normal troubleshooting produced nothing. I
> decided to check the tubes as stated above, it has been a while. All tubes
> tested above specs.
>
> Swapped the IF module, still dead. Audio module, still dead. I had already
> checked the cables from the multi-coupler. The ballast was good, the
> OA2 was good, 150 volts.
>
> I should have checked out one specific tube before I swapped out those
> modules as after doing it, I remembered having this problem before.
> It was V401, but it failed the test on the same tester in the past.
> I swapped it out anyhow and bingo, problem solved. That along
> with a few others will make a radio deader than a door nail. I know most 
> of you
> already know this. I am just passing my learning experience. I am always
> thrilled when I am able to solve problems without getting the iron out.
>
> Scott W#cv
>
>
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