[AMRadio] 6BE6


David Knepper cra at floodcity.net
Thu Jun 24 10:53:59 EDT 2004


Interesting experiment is put a variac on your receiver to see how low you
can go without affecting performance.  I have found that I can go to 100 AC
on my Collins without any serious degradation of performance.

Just my two cents worth.

Dave, W3ST
Publisher of the Collins Journal
Secretary to the Collins Radio Association
www.collinsra.com
----- Original Message -----
From: "Brett gazdzinski" <Brett.gazdzinski at mci.com>
To: "'Discussion of AM Radio'" <amradio at mailman.qth.net>
Sent: Thursday, June 24, 2004 8:55 AM
Subject: RE: [AMRadio] 6BE6


> 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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