Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: okguitarman on May 23, 2016, 06:46:16 pm
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I Have a set of trans. power and output from Backstair HT5, Voltages are (386v red to red no center tap) and (18.4 center tap 18.4)
With Hybrid SS/Tube Bridge Full Wave Rectifier what voltage will I have? With 5Y3
Trying to figure out what amp to build. Amp was push pull 12BH7
I think the output is 22k/8 and 16
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Voltages are (386v red to red no center tap) and (18.4 center tap 18.4). With Hybrid SS/Tube Bridge Full Wave Rectifier what voltage will I have?
With cap input filter, unloaded B+ will be 545VDC. How do you plan to heat the 5Y3?
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Separate tran.
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I think I was over thinking the no center tap that was the voltage I figured.
Hybrid SS/Tube Bridge Full Wave Rectifier was from your page Thank you!
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I tied the 386v to Diode rec. and got 355v
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> I tied the 386v to Diode rec. and got 355v
Put a capacitor on it.
No cap, you get the Average of a bump-wave. In theory 386 * 0.9 is 347V. Your 386 may be higher no-load, or your meter may mis-interpret a big bump wave. IAC, 347V==355V for any practical purpose.
With cap you get the Peak of the wave. 386 * 1.414 is 545V, what you-all are computing and expecting.
If your load is just a meter, the cap can be 0.5uFd, maybe as small as 0.1uFd, though you surely have some 10 to 100 uFd on hand. Note that 545V is a lot for many caps. e-caps tend to top out at 450V-500V. Film can be bought any voltage but we rarely buy over 400V for routine audio circuits.
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Ah thank you had me scratching my head! Makes perfect sense
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Hybrid SS/Tube Bridge Full Wave Rectifier was from your page Thank you!
Thanks for making me look at that drawing. One of the diodes was drawn backwards. I've corrected it now.
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I am on a mac I wished I had visio
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What could I use that trans. for Maybe a stand alone reverb. Would the voltages work? voltage should drop when loaded.
Just looking for a new project.