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Old 24th July 2017, 05:53 AM   #11
Hikari1 is offline Hikari1  United States
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Thanks everyone for the help.
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Old 24th July 2017, 07:16 AM   #12
AndrewT is offline AndrewT  Scotland
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Quote:
Switch on. You can now measure the voltages between all the other tappings.
check the voltage across the primary taps.
This lets you check you have wired them correctly.
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Old 31st July 2017, 06:03 AM   #13
Hikari1 is offline Hikari1  United States
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I've got it up and running and connected to the cap bank. I am reading 34V rails unloaded. How much voltage drop can I anticipate when loaded (F5T, 2A bias)? Hoping for 32V rails.
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Old 31st July 2017, 08:24 AM   #14
AndrewT is offline AndrewT  Scotland
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Is the 34V the DC voltage at the amplifier power terminals, when the amplifier is set to zero bias current?
Or is it the voltage stored on the PSU capacitors when there is no load on the PSU?
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Old 31st July 2017, 11:21 AM   #15
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Help me with this toroid!
estimate 1.25 x Vac , when loaded
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Old 31st July 2017, 02:32 PM   #16
Hikari1 is offline Hikari1  United States
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Quote:
Originally Posted by AndrewT View Post
Is the 34V the DC voltage at the amplifier power terminals, when the amplifier is set to zero bias current?
Or is it the voltage stored on the PSU capacitors when there is no load on the PSU?
Measured at the last cap in the cap bank. The amp boards are not installed yet.
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Old 31st July 2017, 02:40 PM   #17
AndrewT is offline AndrewT  Scotland
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Then expect it to drop when you connect the amp. It might lose a couple of volts.

As you bias the output stage it will drop more, maybe 4 to 5 more volts.
i.e. 34 - (2+5) = 27Vdc
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Old 31st July 2017, 04:04 PM   #18
Hikari1 is offline Hikari1  United States
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Great. Thanks. Here's a pic. Thanks all for the help.
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Old 31st July 2017, 04:11 PM   #19
Mark Johnson is offline Mark Johnson  United States
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Additional options in this thread:
A little tester to determine transformer PhaseDots with no scope or signal generator
If you've got a signal generator and a scope,
Click the image to open in full size.

(You could also use a protoboard + NE555 oscillator instead of the signal generator)
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Old 10th August 2017, 07:23 PM   #20
Hikari1 is offline Hikari1  United States
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The amp is up and running with 30.9v rails.

Admittedly, Iam not sure if the transformer primaries are in phase. Does it really matter? What are the drawbacks when out of phase?
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