[AMRadio] 6BE6


Brett gazdzinski Brett.gazdzinski at mci.com
Thu Jun 24 07:55:32 EDT 2004


I don't know.
But some tubes always test on the weak side on my tube tester, I think
it's the settings for that tube type being off, as every tube does maybe
70% tops.
Other tube types may get up to 90%...

Running tubes to hard will cause them to fail, excessive plate voltage,
screen voltage, plate current.
Cathode resistors going low, shorted/leaky cathode bypass caps?

Funny, because I have found the small tubes in receivers to work fine
At 100 volts or less, no need to strap them.

The 6C4 in my homebrew receiver (local osc) works fine as low as 30 volts!
I run it at 105 volts, but don't need to, and above about 75 volts
gives very little extra output.


Collins used to advertise they ran the 75s series at 150 volts to reduce
heat and
extend the life of the tubes...

Maybe run a test, and see just what the tubes are running at voltage and
current wise...

Brett
N2DTS 


-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Jim Wilhite
Sent: Wednesday, June 23, 2004 5:18 PM
To: amradio at mailman.qth.net
Subject: [AMRadio] 6BE6


I have several receivers that use the subject tube.  Each time I have a
problem the first thing I do is check the tubes in a Western Electric
KS-15650 and when I get to the 6BE6, I find they are weak most of the time.

I wonder what luck others have had with the tube?  Do you replace them
often?  What kind of lifespan do they seem to have?

I replaced two in an HRO 60 about 2 years ago and found a bad one today.
What say you?

73  Jim
de W5JO


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