[R-390] Line audio output problem and 6C4 RF tubes

[John Flood]

Hi,

These were GE tubes made in the last week of Nov. 1965.

John



>
>From: Les Locklear <leslocklear at cableone.net>
>To: Roy Morgan <k1lky at earthlink.net>; John Flood <kb1fqg at yahoo.com>
>Cc: R-390 at mailman.qth.net
>Sent: Thursday, August 6, 2009 1:58:36 PM
>Subject: Re: [R-390] Line audio output problem and 6C4 RF tubes
>
>
>Many years ago, I had over two dozen 6AK5/5654 JAN General Electric tubes. Every single one was shorted or gassy. They all had the same batch numbers.
> 
>Les Locklear
>Hammarlund HQ-180A
>Hammarlund SP-600 Re-Engineered by John R. Leary
>JRC NRD-545
>Ten Tec RX-350
>(1 R-390 and 33 R-390A's all long gone)
>----- Original Message ----- 
>>From: Roy Morgan 
>>To: John Flood 
>>Cc: R-390 at mailman.qth.net 
>>Sent: Thursday, August 06, 2009 11:53 AM
>>Subject: Re: [R-390] Line audio output problem and 6C4 RF tubes
>>
>>
>>On Aug 6, 2009, at 12:41 PM, John Flood wrote:
>>> ... all three of the 6C4's bad( only slight deflection on the  
>>> TV7. ... guess that  lot had quality problems  but I still thought  
>>> it strange.
>>
>>
>>John,
>>
>>A lot can have problems.  I bought four Western Electric mini tubes at  
>>a fest one time and found all four gassy.  Close examination of the  
>>pinch off tip at the top showed a possible gas leak. The  
>>manufacturing  process was so consistent (the ultimate goal of tube  
>>manufacturing) that they must have tested ok at production, but all  
>>had a very slow leak.
>>
>>Roy
>>
>>Roy Morgan
>>k1lky at earthlink.net
>>529 Cobb St.
>>Groton NY, 13073
>>Home: 607-898-3607
>>Cell: 301-928-7794
>>
>>
>>
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