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PostPosted: Thu Nov 29, 2018 4:53 pm 
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Joined: Sun Oct 27, 2013 9:54 am
Posts: 10
Hi,

A couple of years ago I built a trinity tweed. The amp turned out beautifully and I loved the experience. Recently I've been wanting an amp with more headroom and an overdrive channel so I decided to have a crack at the OSD kit.

I'm moving through the build slowly. Today I started to install and wire the transformers.

When testing the power transformer everything seems to check out except for the Yellow wires (5V) which are reading approx. 80V each.

I'm not sure what to do!

The other voltages seem good:
Green wires to pilot light approx 3V each
Red wires 331 and 327
Red/Blue 45

Thanks!

Jim


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PostPosted: Sat Dec 01, 2018 4:21 am 
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Experienced
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Joined: Sat Dec 04, 2010 3:42 pm
Posts: 271
Location: Qualicum Beach, BC
You should see 5VAC across the two yellow wires. Don't measure from each yellow wire to ground. The 5 volt winding is not referenced to ground so it's free to float to whatever voltage it wants. This is normal. As long as you measure about 5 volts across the two yellow wires you are fine.


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PostPosted: Sat Dec 01, 2018 10:45 am 
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Joined: Sun Oct 27, 2013 9:54 am
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Thanks Mitch!

I get 5.5V when measured across the yellow wires.

So I have,
6.5V on the green wires at the pilot light
5.5V on the yellow wires
665V on the Red wires

looks like everything checks out.

I'm a little embarrassed to admit I didn't realize that across the wires meant a probe to each wire. I thought it meant each wire measured to ground then the two readings added together.


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PostPosted: Fri Dec 14, 2018 12:23 pm 
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Holy Ghost
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Joined: Sun Mar 13, 2005 4:10 pm
Posts: 7181
Location: Brighton, Canada
Yes, if there is a centre tap, you canference to ground. Now you know!

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