Hello,
I have received a bunch of Hammond 167L80 transformers. It gives 2 amp at 80V CT.
I am simulating a suitable tube rectifiler by Duncans Desinger2...
Since the iron's big power, I have problem in finding suitable tubes. The sofeware give waring to most of the rectifiers....
except 5U4XX,5VXX
I am looking for tubes endurable of high current. I mean is there any best choice for low voltage,but high current rectifying? I find it that after doubling the voltage, those $5 iron are really convienient for everything! Except applying any choke to the circuit.
😎 😎 😎
Thanks for looking...
C.C.
I have received a bunch of Hammond 167L80 transformers. It gives 2 amp at 80V CT.
I am simulating a suitable tube rectifiler by Duncans Desinger2...
Since the iron's big power, I have problem in finding suitable tubes. The sofeware give waring to most of the rectifiers....
except 5U4XX,5VXXI am looking for tubes endurable of high current. I mean is there any best choice for low voltage,but high current rectifying? I find it that after doubling the voltage, those $5 iron are really convienient for everything! Except applying any choke to the circuit.
😎 😎 😎
Thanks for looking...
C.C.
5U4 and 5V4 are very good rectifiers, I like 5V4 because of the slow warm up.
What is the current of your circuit? the tube database at duncanamps.com gives a good idea of current capacity.
You could always just use a silicon diode bridge (4x 1N5408) they have good current capacity.
What is the current of your circuit? the tube database at duncanamps.com gives a good idea of current capacity.
You could always just use a silicon diode bridge (4x 1N5408) they have good current capacity.
Or consider using a pair of TV damper diodes - e.g. 6CJ3 - maybe?🙂
You would need two 6.3V windings though
Brian.
You would need two 6.3V windings though
Brian.
Wah!
quote ""may we know what load you are looking at?
?? volts @ ?? mA""
The load is only around 200V (80V X 2 = 197V for tubed voltage multiple) and a few mAs. Yeah... I know 2A is over kill, but the transformer is only $5 each....
Using 5XXXX is kind of overkilling in sence of designed handling voltage, so I am asking. I've checked the tube datasheets. They are of high current and high voltage types. I have bunch of EZ81, but they are too little for the game.
So much priceless suggestion! Thanks for all!
🙂 🙂 🙂 🙂 🙂
quote ""may we know what load you are looking at?
?? volts @ ?? mA""
The load is only around 200V (80V X 2 = 197V for tubed voltage multiple) and a few mAs. Yeah... I know 2A is over kill, but the transformer is only $5 each....
Using 5XXXX is kind of overkilling in sence of designed handling voltage, so I am asking. I've checked the tube datasheets. They are of high current and high voltage types. I have bunch of EZ81, but they are too little for the game.
So much priceless suggestion! Thanks for all!
🙂 🙂 🙂 🙂 🙂
Something is strange here, you say the load is only a few mAs but an EZ81 is too small? for a few mAs you can use almost any tube rectifier, a EZ81 should be OK as well as many other tubes, remember that it is the load that determines the max current trough the rectifier not what the transformer can give.
If you have problems with exceeding peak current it probably depends on that your input cap is too big, most tube rectifiers can only handle ~47uF max, reduce the cap or connect a series resistor before the cap to reduce the peak current.
Can you post your components values?
Regards Hans
A good indication of the voltage and ripple i will get for parts i want to use and for the current draw of my circuit.
For the results you will get, what interests you most that will apply to the circuit?
Bas Horneman said:
Nothing really the most...more something to play with and plan the psu a little with..........being able to see the effect of certain things...like if I change the current draw...what happens...so it's more a toy than an important tool to me. But you could really use it as in important tool. However...the amount of ripple will not really tell me anything about how something will sound...(for instance the tool can't tell you at all the effect on sound between a SS rectifier or tube rectifer).only what the ripple is...
(Ok it is a rough indicator of how much hum will be there (if building an SE amp) )
So nothing really serious or definitive that I look for.....as I will change the PSU later after measuring and listening anyway.
Bas Horneman said:
hi, you mentioned the diffrence in sound between ss and valve
rectification, this is a subject I am interested in as I am a guitarist
and guitarists can hear the diffrence . but i am not shure about some of the explanations i have heard:
main 1: valve rectifiers cause a slump in power that gives a destinctive sound when driven hard.
Well I cant see how thats the reason as the current going through the output should be comming from the caps with the valve continualy topping up the res caps, unless the whole powersupply has been designed inadequetly.
I personaly beleave it to do with the impeadance of the power supply.
what do you think?
Stormy
Hi,
You nailed it...
That's what happens and that's where different rectifiers respond differently causing their typical distortions.
Cheers,😉
You nailed it...
That's what happens and that's where different rectifiers respond differently causing their typical distortions.
Cheers,😉
fdegrove said:
I must admit that looking at some guitar amp designs
there are a few questionable parts in the designs
one in particular that has often concerned me is the ammount
of amp designs i have seen that exceed "max" valve characteristics .
have thay done it deliberatly so you have to buy new valves
more often hehe :0)
Incidently my origonal Mullard (GB) valves still sound sweet
40 years on in 1 of my ac30's in the other i cant boast the same.
stormy
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