Formula for calculating HT voltage?

[LowRedMoon]

I can't seem to find this one elsewhere for some reason.

I know it's pretty basic stuff, but hey..

Basically, I want to learn the relationship between the AC from the transformer, the associated rectifier and the voltage that is produced.

Any good links? BTW - I have left my "Valve Amplifiers" book somewhere between Connecticut and Pittsburg, so I won't have that as a reference until I order a new one.

Thanks!

[leadbelly]

http://duncanamps.com/psud2/index.html

[LowRedMoon]

Wow!

Thanks, Leadbelly.

[Tom Bavis]

Here's a good reference:http://www.hammondmfg.com/pdf/5c007.pdf

[Gold_xyz]

With no load the formula is very easy VDC = VAC * sqrt(2)
example 15Vac = 21.2 Vdc (after rectifier & caps)
But in reality it needs to keep in mind the loss of tension
on the rectifier and on inside resistance.

bye

[leadbelly]

Originally posted by Gold_xyz
With no load the formula is very easy VDC = VAC * sqrt(2)
example 15Vac = 21.2 Vdc (after rectifier & caps)

This is the Tube forum.

[woody]

But you need to take into acount the voltage drop across
the diodes. Case in point I needed a 6.3vdc supply and had
a spare 5v winding well 5v x 1.41= 7.05v which seems too high
for my tubes but when built it prodused 6.12 v because ~1v
lost across the diode.


Woody

[Gold_xyz]

Originally posted by leadbelly


This is the Tube forum.

Ouch, sorry

I meant : Example 510Vac * sqrt(2) = 721Vdc

bye

[leadbelly]

Originally posted by Gold_xyz
Ouch, sorry

I meant : Example 510Vac * sqrt(2) = 721Vdc

bye

No, that's still not my point, that formula is useless when talking about tube rectifiers, even no load.

[sorenj07]

of course, only tube rectifiers are usable in tube amps...