FS: Phantom 500 /no tubes
RadioDoc37
working until some tech removed the tubes and they got lost over time. I know
it produces plate voltage. Uses a slew of 6LQ6 tubes I think 10. It appears to
be in good condition. Make offer or trade for?
Mike Please Email
Mike Schuckert
6LQ6 will work but if I remember right the proper tube was a 6MJ6 which
was a higher priced tube even in the 60's when I used them in RCA
television sets.What do you want for it? How long has it been out of
service? Thanks
Toll Free
original equipment, and the RF version (so I was told) RF Black Cap Double
Strapped Plate will NOT work in a D & A amp worth a $hit.
--
Remember.... Technicians make it happen!
Toll Free
http://www.bigradios.com/tollfree
One of the Big Johnson Boys in the Dome!
Every woman likes a man with a great big Johnson!!!
Mike Schuckert wrote in message <35F345...@newulmtel.net>...
Craig
reason do you beleive that the "black cap" tubes don't work?
In article <6svpm8$o9c$1...@news5.ispnews.com>, toll...@bigradios.com says...
speedbuggy714
tan and creme colored. Another is a tripple stage (3 power levels) with also
10 6lq6 tubes tan and cream color. These colors were the latest versions
out. They were built in scottsbluff,nebraska. The third one is brand new in
the orginal factory box and is one of the first versions. It is a twelve
tube dual stage (two power levels). It is the gray color and runs the black
steel caped, red labled, 6mj6 tubes which actually say D&A printed right on
the tubes. So I would say that the orginal tubes from the factory were the
6mj6 tubes with the black caps but of course as the availability became
scarce for the 6mj6 (strongest) tubes they went with the 6lq6 tubes then
later with the combination 6lq6/6je6c type tubes. The only tubes that seem
to last in the D&A brand amps is the yellow, green, or red labled sylvanias
or the blue labled phillips/ecg brand tubes. ( I'm talking about the 6lq6
style) The GE and RCA brand's available today do not seem to last long at
all in the D&A products. I only use one and that is only about 10 minutes
every 3 months or so but I have a matched set of 10 blue labled phillips/ecg
tubes in it and when I do run it I must admit I drive it hard. I key into it
about 2 watts but swing about 35 . This gives me a final output of about 200
watts swinging 1200 watts. (bird 43 w/older style peak reading kit) I have
had the same tubes in it for about 7 years now and have not had any drop in
power. I must say they are one of the toughest set of sweep tubes I have
seen. I guess buying new and matched helps alot plus keeping the dead key
low.
I don't like sweep tube amps much but I must admit I do like the D&A
Phantoms and Mavrick 250's. All the parts inside are easy to find with the
exception of transformers and good quality and brand tubes.
Mike
Toll Free
I saw a person run those black cap tubes in their Phantom (the 4 into 8
model) and it dropped power down to 300 watts PEP output. He called RF
Parts up, spoke with Merrit and he told him to send them back because they
where incompatible with the D & A amps. If you look in the old RF Parts
catalogs, it will state in them that the tubes are incompatible with D & A
equip.
--
Remember.... Technicians make it happen!
Toll Free
http://www.bigradios.com/tollfree
One of the Big Johnson Boys in the Dome!
Every woman likes a man with a great big Johnson!!!
speedbuggy714 wrote in message <6t2fkm$7d4$1...@cletus.bright.net>...
dennis W. Ostrowski
>
> Peter Dahl makes transformers for them.
>
> I saw a person run those black cap tubes in their Phantom (the 4 into 8
> model) and it dropped power down to 300 watts PEP output. He called RF
> Parts up, spoke with Merrit and he told him to send them back because they
> where incompatible with the D & A amps. If you look in the old RF Parts
> catalogs, it will state in them that the tubes are incompatible with D & A
> equip.
Toll,
The 6MJ6 tubes had a little more plate
capacitance.
To replace 6LQ6's with them, you had to re-adjust
the coil slightly so that the variable tuning
capacitor could resonate the pi network again.
If you would have taken a closer look at the one
that dropped in power, you would have noticed that
the output tuning or driver tuning capacitors (or
both) were fully unmeshed at the highest power
output. Opening up the coil a little and allowing
the capacitor to work properly to 'tune' the place
circuit would have resulted in the same or
possibly greater power output and longer life from
the tubes because you would have 'dipped' the
plate current...
I still prefer the dark green colored sylvania
tubes with the 'activated', (read that as
nuclear), cathodes.... I could always get the most
power out of them because they seemed to have the
highest transconductance ratings at that
relatively low plate voltage.....
Dennis
#12
Toll Free
makes sense. I also thought that maybe if you dropped the value of the
coupling cap it may help too.
--
Remember.... Technicians make it happen!
Toll Free
http://www.bigradios.com/tollfree
One of the Big Johnson Boys in the Dome!
Every woman likes a man with a great big Johnson!!!
dennis W. Ostrowski wrote in message <35F597B9...@lucent.com>...
CB711MACK
I have a 12 tube and a 10 tube model, and I have been running the black cap
tube, excpt it is a RCA, and some green tubes, and etc tubes, and it all
works....the tubes I have list all three numbers you have mentioned
6LQ6/6JE6C/6MJ6 as the same tube.....
John
