cap value for 6X4 rectifier?

[Giaime]

Is there a good tube-based regulator that comes to mind? I see a good SS regulator on Gamie's Audio Lab

But I am trying to find something that allows for simple Point-to-Point soldering and I have heard great things about the 30h-50uf-30h-50uf with the preamp I am going to use

Why I deserve the continuative misspelling of my name?



Seriously, my webpage doesn't allow (for an unkown motive) the linking of images. You can link the webpage where there is the image: you're probably talking about this page.

That's the first schematic in the page: very basic Maida regulator. Could be improved.

 

[anatech]

Hi Giaime,
Your name does have an odd spelling from where I come from, but I can get it right.

-Chris

 

[Giaime]

Hi Giaime,
Your name does have an odd spelling from where I come from, but I can get it right.

-Chris

Hey Chris,

after so many times you typed it in the various threads I opened ...

 

[anatech]

Hey!
I got it right the first time!

 

[Geek]

you certainly use wimpy xformer

that can be explanation for long life of (nearly ) abused 6X4

Must be true if even you think that's abuse.

I'll up it to 100uF and see how long it takes to die just as an experiment

 

[Zen Mod]

Must be true if even you think that's abuse.

I'll up it to 100uF and see how long it takes to die just as an experiment

 

[Zen Mod]

The power Transformer is 250-0-250v at 60ma. the desired operating point on my 5687 tube will be at 140v, at 11ma, so 22ma for both halves of the dual triode.

-Alex

perfect for OA2
say-just one , burning some 20 to 25mA,then RC to each anode ,burning additional 10 Volts

 

[anatech]

Hi Geek,

I'll up it to 100uF and see how long it takes to die just as an experiment

This has been done many times. Just look at Michael Elliot's stuff. That guy can make a Cetron 5U4 arc.

-Chris

 

[lndm]

I have formed the impression that a gross excess of capacitance or lack of series resistance will cause a vacuum diode to arc, does anyones experience bear this out?

 

[alexmoose]

Why I deserve the continuative misspelling of my name?

I'm Sorry Sir

Damn my Dyslexic Eyes!! *screamed in a Shatner-esc tone*

 

[alexmoose]

perfect for OA2
say-just one , burning some 20 to 25mA,then RC to each anode ,burning additional 10 Volts

woah! Cold cathodes scare me! could I see a very basic circuit?

 

[alexmoose]

This is a guess, will this work? sorry about the low quality, I made it in 20 minutes

 

[Geek]

Hi Geek,

This has been done many times. Just look at Michael Elliot's stuff. That guy can make a Cetron 5U4 arc.

-Chris

Ok, I won't have to then.

ZM, you can dance the dance of joy now

 

[anatech]

Hi Geek,
Have a look at some 40's and 50's equipment. Those guys knew what they were doing. Sometimes it wasn't about cost.

-Chris

 

[Zen Mod]

This is a guess, will this work? sorry about the low quality, I made it in 20 minutes

on sunday,when I'll be near my PC ,I'll answer you;
sheeeeeeeeeeeeety IE just killing me on this machine
PS. NO CAP IN PARA WITH GAS TOOB!!

 

[Burnedfingers]

Why I deserve the continuative misspelling of my name?

Easy solution.... Why not just call you Bob. Its easy to remember and easy to spell.

 

[Geek]

Hiya Chris,

Hi Geek,
Have a look at some 40's and 50's equipment. Those guys knew what they were doing. Sometimes it wasn't about cost.

-Chris

I just got this Kaiser of a power supply dropped on me from that era to checkout/fix. I agree!

Easy solution.... Why not just call you Bob. Its easy to remember and easy to spell.

Yeah, bbo would be good name..... oooops, keyboard juxtiposition

 

[alexmoose]

Any help yet? I want to be enlightened, I need to build a pre-amp because my Ipod cannot drive my amp alone!

 

[tubetvr]

Any help yet? I want to be enlightened

Then it is a good idea to use a gas tube! Your schematic is almost inverted, you should start with raw DC then add filtering and then at the end you put the gas tube. The gas tube will improve the regulation so there is less need to use a choke so something like this is the normal connection:

Rectification > cap > resistor > gas tube > small cap, (max 0.1uF) this can in many cases be left out. The 2nd resistor must be calculated for the current draw which is current for the amplifier + current for the gas tube, the gas tube should carry 5 - 30, 35 or 40mA depending on the type, regulation gets bad if current is less than 5mA and you risk burning the gas tube in advance if current is too high.

Example: DC at the last cap 200V and you use a 0A2 which has a regulation voltage of 150V you should therefore drop 50V over the last resistor. Assume that the amplifier draws 20mA, then a suitablle current through the resistor is 35mA which leaves 15mA for the gas tube, the resistor value is then U/I or 50/35 ~ 1.43kohm. For higher voltages it is possible to connect several gas tubes in series.

Regards Hans

 

[alexmoose]

How about this?