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

[Les Locklear]

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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