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.
Publisher of the Collins Journal
Secretary to the Collins Radio Association
----- 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...
> -----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
> 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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