[Drake] 6JB6A tubes

[Garey Barrell]

Darrell -

Interesting...  The International tubes I tried would neutralize with no 
problem, but were very hard to drive, particularly on 15 and 10M.  I 
attributed it to the considerably different internal lead structure 
compared to US made tubes.

Some brands require considerably different neutralization capacitances.  
I'd just as soon avoid making changes to the transmitter though until it 
becomes necessary.  So far "good" brand tubes are still readily available.

73, Garey - K4OAH
Atlanta

Drake C-Line Service Manual
<http://www.k4oah.com>



hbrnut at earthlink.net wrote:

>I have never found a brand of tubes that wouldn't work, although it is sometimes necessary to change the value of the fixed capacitor across the neutralizing capacitor. This includes all of the major branded ones as well as some oddball ones. I have used the "International Service Master' tubes successfully.
>
>73,
>Darrell, WA5VGO
>  
>