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School of TUBES

post #1 of 18
4/6/10 at 11:10am
Thread Starter 
I am setting this thread for all of us who wants to learn the principles of tubes,

how they work in different designs and so on.

how to calculate and planing the designs.

how to work whit them - safety

more and more questions should be asked.

I WANT PEOPLE THAT HAVE GREAT KNOWLEDGE TO HELP US ALL...UNDERSTAND THE WORLD OF TUBES. PLEASE...

My first question is:
I have build a SRPP for my DAC (gamma2) and want to know how to calculate the right input capacity of the SRPP?
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post #2 of 18
4/6/10 at 11:28am
Oooo I have been wondering this myself recently.

I will be following with great interest.
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post #3 of 18
4/6/10 at 11:36am
Quote:
Originally Posted by GWorlDofSPACE View Post
I am setting this thread for all of us who wants to learn the principles of tubes,

how they work in different designs and so on.

how to calculate and planing the designs.

how to work whit them - safety

more and more questions should be asked.

I WANT PEOPLE THAT HAVE GREAT KNOWLEDGE TO HELP US ALL...UNDERSTAND THE WORLD OF TUBES. PLEASE...
google has that knowledge. There is simply too much.

Alternately obtain Morgan Jones' book Valve Amplifiers. Its a great starter. After that you should be able to decide what you want to learn more about in better detail and find it in the older textbooks on the subject.
Quote:
My first question is:
I have build a SRPP for my DAC (gamma2) and want to know how to calculate the right input capacity of the SRPP?
This is actually your fifth question, the first four are the broad questions quoted above.

Do you mean calculating the input capacitance, or what value capacitor to use based on some desired bass rolloff. Calculating the value of input capacitor is the same as for SS circuitry.
F=1/(2pi*R*C)
Where F=the roll off frequency
Pi=3.1415926535
R=input resistance of the circuit in ohms (excluding special cases, this is the value of the grid leak resistor)
C=value of the series capacitor in farads

To calculate the input capacitance of an SRPP circuit one must know quite a great deal about the specifics of the circuit.
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post #4 of 18
4/6/10 at 11:57am
Thread Starter 
Quote:
Originally Posted by nikongod View Post
Do you mean calculating the input capacitance, or what value capacitor to use based on some desired bass rolloff. Calculating the value of input capacitor is the same as for SS circuitry.
F=1/(2pi*R*C)
Where F=the roll off frequency
Pi=3.1415926535
R=input resistance of the circuit in ohms (excluding special cases, this is the value of the grid leak resistor)
C=value of the series capacitor in farads

To calculate the input capacitance of an SRPP circuit one must know quite a great deal about the specifics of the circuit.
I meant what value should the input capacitor from DAC to tube grid.
I am using the 6H1P-EB tube.
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post #5 of 18
4/6/10 at 12:25pm
Big second for the Morgan Jones book. Best tube investment you will ever make.
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post #6 of 18
4/6/10 at 12:30pm
There is also Pete Millett, tube historian:

tubebooks.org - Vintage info from the age of vacuum tubes

The technical books section will take you as deep as you care to go, and further.
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post #7 of 18
4/6/10 at 1:30pm
Quote:
Originally Posted by GWorlDofSPACE View Post
I meant what value should the input capacitor from DAC to tube grid.
This article may be helpful.
link
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post #8 of 18
4/6/10 at 2:46pm
Thread Starter 
Quote:
Originally Posted by nikongod View Post
This article may be helpful.
link
Thanks, you really did help me.
DO you know how much input impedance has the Bijou amp???
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post #9 of 18
4/6/10 at 2:57pm
It depends what pot you used.
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post #10 of 18
4/6/10 at 4:17pm
You can't miss with the Morgan Jones book.

I can also agree that the Pete Millet site has an amazing amount of information, almost 4gb's worth. It has a lot of the technical papers that the tube designers wrote. I've seen some of them reprinted and being sold, but why buy it when it's being offered for free.
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post #11 of 18
4/6/10 at 4:38pm
Thread Starter 
Quote:
Originally Posted by nikongod View Post
It depends what pot you used.
So its 0-50K + 10K is the resistor to grid???
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post #12 of 18
4/6/10 at 4:52pm
Also wanted to point out that I've found Bruce Rozenblit's "Beginner's Guide to Tube Audio" very helpful, in addition to everything else mentioned here.
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post #13 of 18
4/6/10 at 4:56pm
Quote:
Originally Posted by Uncle Erik View Post
Also wanted to point out that I've found Bruce Rozenblit's "Beginner's Guide to Tube Audio" very helpful, in addition to everything else mentioned here.
Totally agree - great read and very informative.
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post #14 of 18
4/6/10 at 5:55pm
Thread Starter 
Thank you all for the suggestions about the literature.
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post #15 of 18
4/6/10 at 7:13pm
NEETs Modules <---Module 6 deals with tubes. I purchased these on CDs on ebay for cheap, but you can study it all online if you have internet access.

http://www.nmr.mgh.harvard.edu/~reese/RC10/rc10.pdf <---pretty big pdf(7.91MB), so it may take a minute to download.


Tubes for Newbies
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