Hi,
Just wondering - is duncanamps' PSU designer odd?
I've tried to model with a 5V4 regulator, 7H choke and 15uF initial smoothing cap. Now, how do we proceed?
It won't let me put in a current tap with tank cap right after the inductor, even though thats how boozhound lists it to be, also will tell me that most things are an 'illegal combination!!'
Prolly an easy one, me having an off night!!
12SN7 driver and 6V6 outputs
L
Trying to model this
Just wondering - is duncanamps' PSU designer odd?
I've tried to model with a 5V4 regulator, 7H choke and 15uF initial smoothing cap. Now, how do we proceed?
It won't let me put in a current tap with tank cap right after the inductor, even though thats how boozhound lists it to be, also will tell me that most things are an 'illegal combination!!'
Prolly an easy one, me having an off night!!
12SN7 driver and 6V6 outputs
L
Trying to model this
An externally hosted image should be here but it was not working when we last tested it.
You cannot insert two similar elements (2 caps, 2 current taps, nor a R and a CT) in parallel.
Nor remove an element that provoque this situation.
For exemple, an LC filter between two loads (either R or CT) can't be removed unless you remove one of the loads before.
Sometimes, you cannot insert a CT after a cap, but only before it.
The same result, obviusly
Yves.
Nor remove an element that provoque this situation.
For exemple, an LC filter between two loads (either R or CT) can't be removed unless you remove one of the loads before.
Sometimes, you cannot insert a CT after a cap, but only before it.
The same result, obviusly
Yves.
Attachments
I like using LTspice. I have a few examples, here:
http://www.fullnet.com/~tomg/gooteesp.htm
Tube models are available, from other sources (including Duncan's site, I think).
http://www.fullnet.com/~tomg/gooteesp.htm
Tube models are available, from other sources (including Duncan's site, I think).
Psychobiker said:
It depends on the amplifier design/topology
A push pull can be completly quiet with up to 20 V peak to peak on the plate supply.
An SE penthode may accept up to 5 V on the plate supply if the screen is "clean".
An SE triode may produce unnaceptable hum in hi efficiency speaker with just 1V p to p
What are you building ?
Yves.
SE. I have 50mV P-P
L
Tap for the 6V6s
And for the 12SN7
L
Tap for the 6V6s
An externally hosted image should be here but it was not working when we last tested it.
And for the 12SN7
An externally hosted image should be here but it was not working when we last tested it.
with a little fiddling, 50mV became 2mV.
Those are acutlaly 90mA and 10mA draws...but sequentially kicking in after a 1sec
Those are acutlaly 90mA and 10mA draws...but sequentially kicking in after a 1sec
An externally hosted image should be here but it was not working when we last tested it.
Hi Psychobiker
Maybe you won't need it, but it is interesting literature anyway:
'lowering SE amplifier noise' (in cathode biased amplifiers) by Broskie
http://www.tubecad.com/april99/page2.html
http://www.tubecad.com/may99/page3.html
Maybe you won't need it, but it is interesting literature anyway:
'lowering SE amplifier noise' (in cathode biased amplifiers) by Broskie
http://www.tubecad.com/april99/page2.html
http://www.tubecad.com/may99/page3.html
Heh, that's a moot point - remains to be seen once I fire it up, couldn't find a datasheet anywhere for the life of me :S. Just tried a DCR of 50ohm, bugger all changed really. But again, as I say, will report on the 'real world' functioning of the thing. Radionics (who made it), discontinued the thing aaaages ago (<2000)
L
L
Why I don't like PSU
What I hate about PSU II is you never seem to get the same results twice. Here's what it tells me when I plug in the same values Psychobiker:
What I hate about PSU II is you never seem to get the same results twice. Here's what it tells me when I plug in the same values Psychobiker:
An externally hosted image should be here but it was not working when we last tested it.
Cheers, RDF...it slipped my mind the first time that it was acutally a sequential load - but even the slightest deviaton from immediate full load sorts out any over current warnings.
CarlyBoy - You can watch the ripple get a little larger when the load kicks in...but it settles to a healthy <5mV in mine
L
CarlyBoy - You can watch the ripple get a little larger when the load kicks in...but it settles to a healthy <5mV in mine
L
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