[sdiy] B+ Current consumption

[John L Marshall]

I recommend a shunt regulator using an old fashioned glass zener diode the 
OA2. The cool thing about these zener diodes is that they have that modern 
purple LED glow.

Take care,
John
www.sound-photo.com
www.antenna-farm.com

----- Original Message ----- 
From: "Michael Ruberto" <frankentron at hotmail.com>
To: <ajhuovil at cc.hut.fi>
Cc: <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, January 16, 2007 3:48 PM
Subject: Re: [sdiy] B+ Current consumption


>
>>
>>Depends on the tube. 12ax7 will need about 2-4mA, 12au7 maybe 10-20mA.
>>
>
> I am planning to try a few different tubes just for some experiments but I 
> mainly have 12au7. I guess a little extra current capacity wont hurt.
>
>
>>
>>If you need to drop voltage you can use several high power zeners in 
>>series.
>>
>
> That sounds like a good idea. I have just located another transformer that 
> has 150V CT. It is about half the price too.
>
> For the heaters I see some circuits use 12V and others use 6V. I even have 
> one where it specifies 4V. Does this voltage requirement vary with the 
> tube too?
>
>
> M. A. Ruberto
>
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