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Old 8th August 2004, 01:43 AM   #11
RE 604 is offline RE 604  Germany
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Hi Frank ,
you are right , most of this amps are mic preamps , but the V 73 is a 4 watt PP - amp with two EF 804 s and two EL 42 and the V 81 is 10 watt PP with E88 CC , two 5654 and two E 84 L . OK , they are mounted horizontal but believe me , this little power - amps runs very hot and the racks with further amps were above and below . I would have no problem , if a 50 cent tube ( PCL 86 ) failed after a few years ;-)
My Valvo and TFK handbooks says for this small tubes , including E 84 L : "Mounting position any" .
But it says also : "Special precautions must be taken to prevent the tube from becoming dislodged".
Regards , AlexK .
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Old 8th August 2004, 02:02 AM   #12
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am I right to say that some rectifier tubes have to be run the "right side up'??
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Old 8th August 2004, 04:19 AM   #13
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"Groove Tubes" have their logo upside-down, so that the logo would look up-right when mounted upside-down.

Weird...
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Old 8th August 2004, 04:52 AM   #14
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What are the best sockets from new production with octals?
preferrably ceramic and with a good chassis bracket?

I'm really worried as I'm planning on Octal KT90...
Not gonna face them upside down though, right way up, still there should be at least /decent/ connections!
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Old 8th August 2004, 09:57 AM   #15
EC8010 is offline EC8010  United Kingdom
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Quote:
Originally posted by li_gangyi
am I right to say that some rectifier tubes have to be run the "right side up'??
Yes, you are. Mercury vapour rectifiers have strict instructions about their operating orientation, warm-up time before applying anode voltage, and ambient temperature.

Regarding Octal sockets, there's not much point in spending lots of money on beautifully low leakage sockets when the valve that will be plugged into them comes complete with a leaky phenolic base. A cheap ceramic base will do just fine.
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Old 8th August 2004, 08:42 PM   #16
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ok guys, now i have come to some conclusions, rectifier tubes and power tubes standing up-right will live longest and will not detoriate other components as PSU capacitors and others as they would if mounted up-side-down, but that assumes that the psu caps are placed nearby, which they aren't in my particular amp. (separate psu)

lowlevel tubes mounting is of less importance if they does not exceed...say 4W.. 8-)

..then i will mount my tubes sideways instead 8-)
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Old 9th August 2004, 01:41 AM   #17
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Default Re: Re: mounting tubes upside-down

Quote:
Originally posted by Richard C


Absolutely, this should only be attempted when either seated or standing, anything else is just plain showing off and could easily result in injury.

You a woman? Pics plz!!!



Tim
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Old 9th August 2004, 02:47 AM   #18
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Hi,

Quote:
"Groove Tubes" have their logo upside-down, so that the logo would look up-right when mounted upside-down.
Not so weird, really....
That must be their "export" version for all those guitarplaying customers from "Down Under"...

Kidding aside, Groove Tubes caters mainly to guitarshops and repairshops and those tubes with the "upside down" logo are probably intended to go in those Fender (?) amps that have their tubes heads down.

Quote:
What are the best sockets from new production with octals?
Probably the Russian ones. They can be recognized by a cube-like logo on the side rim of the octal sockets.

Reinhofer in Germany has connections with a plant in China where they can make just about any type of socket and topcap to order.
From what I've seen so far quality is on a par with NOS Johnson sockets, which are reputedly among the best ever as far sockets for powertubes go.
Of course there's also the lunatic fringe Yamamoto sockets for those with deep pockets and an inclination to empty them in a hurry...

Cheers,
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Old 9th August 2004, 04:44 AM   #19
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Quote:
Not so weird, really....
That must be their "export" version for all those guitarplaying customers from "Down Under"...

Kidding aside, Groove Tubes caters mainly to guitarshops and repairshops and those tubes with the "upside down" logo are probably intended to go in those Fender (?) amps that have their tubes heads down.

Yeah,
I can see many guitar shops selling only Groove Tubes for valve replacement...
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