Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Fresh_Start on August 04, 2010, 09:30:02 am

Title: Power Transformers & Rectifiers Reference
Post by: Fresh_Start on August 04, 2010, 09:30:02 am

Someone posted a link to this on AX84 and I thought it might be useful:
http://www.hammondmfg.com/pdf/5c007.pdf

Chip

Title: Re: Power Transformers & Rectifiers Reference
Post by: jjasilli on August 04, 2010, 12:19:56 pm

Yes that's been banging around here.  Just posted it yesterday in another thread.  Warning:  for the CT circuits this Hammond chart measures secondary VAC from outside to outside thereby doubling the voltage as usually stated.  Then compensates by halving the forward conversion factor  -- one would think that the forward conversion factor should be kept as a constant.  Can be confusing.

Title: Re: Power Transformers & Rectifiers Reference
Post by: jojokeo on August 04, 2010, 01:35:37 pm

Could you work the math/show the calculation for figuring out the current availability for the full wave bridge capacitor input load example?
Here's two transformer's specs to use for examples as given from two diff websites:

1) Primary 120VAC, Secondaries 306V at 27mA, 6.3V at 1.05A.
2) 18VA AC secondary 120V @ 87 ma 6.3V @ 1.2A

V (Peak) D.C. = 1.41 X Sec. V A.C.
V (Avg) D.C. = 0.90 X Sec. V A.C.
I D.C. = 0.62 X Sec. I A.C.