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 Post subject: Voltages too high
PostPosted: Mon May 18, 2020 5:00 pm 
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Joined: Mon May 18, 2020 4:12 pm
Posts: 2
Just completed my OSD build. It is working but not properly. To start I the amp does work without any abnormal noises but have noticed a couple issues which may or may not be related. Overdrive level and ratio don't seem to do anything, and the volume is lower than it should be.

When back and checked the voltages and found most of them to be too high.
Without tubes the voltage on each of the red Main transformer wires is 400V and B+560V

With the tubes in: B+513V
V1 pin1 209V, Pin 3 1.7V, Pin 6 215V, pin 8 1.6V
V2 pin1 145V, Pin 3 2.8V, Pin 6 221V, pin 8 1.7V
V1 pin1 348V, Pin2 43V, Pin 3 70V, Pin 6 338V, Pin7 44.5V
V4 & V5 Pin 3& 4 515V

My concern being the high B+ , V4 & V5 voltages. Also low voltage on V2 which likely explains the volume.

I am a novice builder and am looking for help as to how to trouble shoot this and any help is greatly appreciated.

Thanks


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 Post subject: Re: Voltages too high
PostPosted: Mon May 18, 2020 7:20 pm 
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Joined: Sat Dec 04, 2010 3:42 pm
Posts: 482
Location: Qualicum Beach, BC
Hi, welcome to the forum!

Just the usual troubleshooting advice:

Make sure all the parts are the right values and are in the right places.
Make sure all your solder connections are good on the board and the tube sockets.
Make sure all your wiring is correct. There are lots of controls and relays in this amp. It's easy to get things mixed up.

Verify that everything that's supposed to be connected is actually connected. Check both visually and using an ohmmeter. Put the probes on the component leads or terminals rather than the solder connections so you are checking the continuity of the solder connections, too.

Some people make a copy of the layout drawing and use a highlighter pen to mark the wires and components as they check.

V2a voltages are low. Check all the wiring to V2 and its socket.
B+ is high. Make sure the power transformer is wired properly for the voltage coming out of your wall.


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 Post subject: Re: Voltages too high
PostPosted: Tue May 19, 2020 10:48 am 
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Joined: Mon May 18, 2020 4:12 pm
Posts: 2
I will continue checking as you suggested.
I was wondering if there was perhaps a way to isolate the problem of at least eliminate some of the circuit to find the problem?

Thank you


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