So, does this mean 22 guage is ok even for wiring the heaters? It says it can take a max of 7A for chassis wiring... but .92 for power transmission... now that I think of it, power transmission would be things like heater wiring, right? And then chassis wiring would be the audio signal path? So I would need something like 16 or larger guage for the heaters at 3A?
HEADPHONE AMP
Hi,
Dimitri,
I sincerely doubt the schematic of the headphone amp was built as you presented.
Maybe it should be presented to your *tubehead* friends as well?
Can you please create a thread of its' own for it next time?
It makes following up on things that much easier for everyone.
Thanks,
Hi,
Dimitri,
I sincerely doubt the schematic of the headphone amp was built as you presented.
Maybe it should be presented to your *tubehead* friends as well?
Can you please create a thread of its' own for it next time?
It makes following up on things that much easier for everyone.
Thanks,
I am doing some assuming here, but after I get this straightened out, I will have the power supply done, I think.
Ok, the design by Joel has 1k of resistance (two 500's in series) with two smoothing caps for a total drop of somewhere around 100 volts. So this means that there is about a 215V drop over the 5Y3GT. Right? So, if I use a 275-0-275V transformer, then I would have to use about 1100 ohms of resistance. Correct? So two 550-ohm resistors in series would give me about 150VDC, right?
I am thinking I will go with the Hammond 270HX transformer. It is 275-0-275@200mA, 5V@3A, 6.3V@6A and is $45. Would this work well?
Ok, the design by Joel has 1k of resistance (two 500's in series) with two smoothing caps for a total drop of somewhere around 100 volts. So this means that there is about a 215V drop over the 5Y3GT. Right? So, if I use a 275-0-275V transformer, then I would have to use about 1100 ohms of resistance. Correct? So two 550-ohm resistors in series would give me about 150VDC, right?
I am thinking I will go with the Hammond 270HX transformer. It is 275-0-275@200mA, 5V@3A, 6.3V@6A and is $45. Would this work well?
About how high is the voltage drop across the smoothing caps? Did I figure corectly that I need about 1100 ohms of resistance to give 150VDC?
EDIT: I think I did figure it wrong... I used 125mA for the current, when I am guessing I should have used 150mA since that is about what the amp section will draw. So this means I need about 1200 ohms... is this right?
EDIT: I think I did figure it wrong... I used 125mA for the current, when I am guessing I should have used 150mA since that is about what the amp section will draw. So this means I need about 1200 ohms... is this right?
That is what I used and got 1233.3333333 etc. I think. So, what, use two 600 something-ohm resistors? And I don't really know the current drop over the 5Y3GT, so I am just kind of guessing... It makes sense though. I guess I'll just guess and see what happens... I have to build something eventually.
TDSL says that the drop across the tube is 50V on one 60V on the other. I need some clarification here- either way I think of this it makes NO sense.
So, we have a 300-0-300V transformer. With Joel's circuit, you get 285VDC out, and the drop across the resisters is about 100V, so how in the world does this work? If a 300-0-300V trans. only puts out 300V TOTAL, then the drop across the tube of 50V would put that below the output automatically.
On the other hand, if the 300-0-300V transformer puts out 600V when rectified, how can using 100V of resistive drop plus the 50 over the tube give 285? Wouldn't we have 450? I don't understand this at all now...
So, we have a 300-0-300V transformer. With Joel's circuit, you get 285VDC out, and the drop across the resisters is about 100V, so how in the world does this work? If a 300-0-300V trans. only puts out 300V TOTAL, then the drop across the tube of 50V would put that below the output automatically.
On the other hand, if the 300-0-300V transformer puts out 600V when rectified, how can using 100V of resistive drop plus the 50 over the tube give 285? Wouldn't we have 450? I don't understand this at all now...
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