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patrickamory 27th August 2007 11:58 PM

Measuring from UK schematic but on US mains
Hi, I need to check voltages on my Radford amp... the (British) schematic only has one set of voltages marked, so I'm assuming these apply when using 220V mains. I live in the US and have the transformers wired for 125V. Is there a formula I can apply to the voltages on the schematic to find the correct readings when using 125V AC power?

mcs 28th August 2007 12:28 AM

If the transformer is wired for 125V mains, then all the voltages in the amp should be the same (apart from the transformer primary of course).

Best regards,

Mikkel C. Simonsen

patrickamory 28th August 2007 12:41 AM

Ah... really? I guess that makes sense. My Leak Stereo 20 schematic shows two sets of voltages, one for 220V mains, one for 110V, so that's why I expected it on the Radford too.

patrickamory 28th August 2007 03:35 AM

Indeed, all the voltages checked out just about perfectly as marked.

What does it mean in the schematic when it says 350 (at a point which measures 350VDC with a load hooked up), and then 170V in italics next to it? Is the 170V without a load, or something?

Sorry for all n00b questions :rolleyes:

DigitalJunkie 28th August 2007 04:54 AM

It could mean that the figure in italics is an AC voltage (if you have a test-tone going into the amp.)

Or,perhaps a standby voltage? (Sometimes common on guitar amp schematics.)

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