[Boatanchors] 6146 vs. 6146A vs. 6146B or 6146W and Grid Current

[Mike Baker]

And speaking of grid current:

One observation I made while setting up a Kenwood TS520 was that once you
overcome the grid losses, drawing any more grid current produced no
additional output. That being the case, I would set the Grid current at 1ma
for two tubes and proceed with normal tune up. It was pointless in
increasing it as it contributed nothing to the end result.

Mike Baker  K7DD
K7dd at cox.net
All QSO's are uploaded to LOTW and EQSL.


-----Original Message-----
From: boatanchors-bounces at mailman.qth.net
[mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of Glen Zook
Sent: Tuesday, July 05, 2011 9:00 AM
To: boatanchors at mailman.qth.net; lee
Subject: Re: [Boatanchors] 6146 vs 6146A vs 6146B or 6146W

Being the person referred to:

(snip)
Another thing is the grid current.  RCA originally did say a maximum of 4 mA
per tube.  However, they eventually reduced that first to 3.75 mA, then to
3.5 mA per tube.  But, running the grid current at, or even near, the
maximum will result in reduced tube life.  Experience has shown that running
the tubes at about 2.5 mA grid current per tube is pretty much optimum.
Most of the 6146 family will produce full output with as little as 1.75 mA
grid current per tube.

(snip)
Glen, K9STH

Website:  http://k9sth.com


--- On Tue, 7/5/11, lee <pulsarxp at embarqmail.com> wrote:

(snip)

The number 2 grid still has a max of 2 watts and the grid current is the
same for all.  That is 4 ma.
 
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