OK,
Can anyone tell me how hot a 5Y3 rectifier runs under normal load?
I don't have one running at the moment to measure.
Also thoughts on heater failure (Short) I have never had any problems, however any thoughts on SS fusing?
Regards
M. Gregg
Can anyone tell me how hot a 5Y3 rectifier runs under normal load?
I don't have one running at the moment to measure.
Also thoughts on heater failure (Short) I have never had any problems, however any thoughts on SS fusing?
Regards
M. Gregg
In my experience a 5y3 is somewhere in the neighborhood of 250-300 deg. F bulb temp. I am not currently using any right now for an actual measurement though. I prefer good old damper tubes like the 6by5. Less voltage drop and isolated cathode. No worries about heater shorts...either it works or it doesn't.
As far as fuses go heck, I'd say they are cheap insurance.
As far as fuses go heck, I'd say they are cheap insurance.
The 5Y3 rectifier,
I have never mounted like this before.
Can be used horizontal if pins 2 & 4 are in a vertical plane..😕
Strange because it puts the tube plates at about 45 deg looking end on to the tube.
Pins 2 & 4, is this 2 at the bottom and 4 at the top ( I assume this is correct) or 2 & 4 at the top of the base? (Just making sure) 🙂
If this is correct then if 2 & 4 are in a sort of vertical plane can the tube be mounted at 45 deg?
Regards
M. Gregg
I have never mounted like this before.
Can be used horizontal if pins 2 & 4 are in a vertical plane..😕
Strange because it puts the tube plates at about 45 deg looking end on to the tube.
Pins 2 & 4, is this 2 at the bottom and 4 at the top ( I assume this is correct) or 2 & 4 at the top of the base? (Just making sure) 🙂
If this is correct then if 2 & 4 are in a sort of vertical plane can the tube be mounted at 45 deg?
Regards
M. Gregg
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The reason is rather simple to understand.
In fact, when horizontally mounted, you must avoid to heat the first anode with the second one.
So, both anodes must be positioned side by side on the horizontal plan, for thermal reason.
If pins 2 &4 are well positioned, this will also force a good positioning of both anodes.
In fact, when horizontally mounted, you must avoid to heat the first anode with the second one.
So, both anodes must be positioned side by side on the horizontal plan, for thermal reason.
If pins 2 &4 are well positioned, this will also force a good positioning of both anodes.
What about heater support?
This is what made me wonder because the plates are at 45 deg looking end on with pins 2 & 4 one above the other.😕
Any thoughts on mounting the tube at 45 deg to the base of the amplifier? I assume its just a variation of the horizontal mounting again 2 & 4 one above the other?
Regards
M. Gregg
This is what made me wonder because the plates are at 45 deg looking end on with pins 2 & 4 one above the other.😕
Any thoughts on mounting the tube at 45 deg to the base of the amplifier? I assume its just a variation of the horizontal mounting again 2 & 4 one above the other?
Regards
M. Gregg
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Possibly a variation between some brands, or some supports...
All you have to remember is to position both anodes side by side, and nothing else.😉
All you have to remember is to position both anodes side by side, and nothing else.😉
Well, there's no air inside the envelope. Internal convection has no connection to cooling in a vacuum valve; some cooling comes from IR radiation, some from envelope conduction to ambient air. Filaments need to not touch anodes, though.
All good fortune,
Chris
All good fortune,
Chris
Well,
With the plates side by side they are widest from top to bottom so I guess the heater would be farthest from the plate if it were to sag.
Convection may effect the tube i.e. heating of the glass around the outside. The air "may"<<its just a guess, be hotter around the envelope from the bottom anode.
Regards
M. Gregg
With the plates side by side they are widest from top to bottom so I guess the heater would be farthest from the plate if it were to sag.
Convection may effect the tube i.e. heating of the glass around the outside. The air "may"<<its just a guess, be hotter around the envelope from the bottom anode.
Regards
M. Gregg
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