Question about Audio Players & Recorders
Replaced the fuse twice, turned on the power at mains, pushed the power switch in and it has blown the fuse each time.
There are millions of DVD players out there. Before somebody can help you you need to give us the make and model number. You have the unit and know what it is, we don't.
Posted on Nov 27, 2014
Testimonial: "Gil, sorry thought i had include make and model, Make:Cambridge Audio. Model:DVD55"
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Posted on Jan 02, 2017
SOURCE: Channel short
Hi there, sounds like you may have a short to ground on the output transistors. Does it have transistors or an IC output. It is most likely that you have not replaced a mica washer or insulator. Check to ground with a meter from the case of the output devices.
Posted on Aug 28, 2007
I have a classic 50/50 as well and re-tubed it with JJ el84s, vintage teslas and mullard 12at7s. As long as you replaced it with EL84s, I can't imagine that the output would be increased enough to damage the OT. When I got my 6505 Combo, one of the 6L6s was bad, and it kept blowing fuses and howling like a banshee. I would think that an OT problem would result in a significant loss of output...or none at all. I've gotten DOA tubes from a few places. I would suggest swapping each tube out 1 by 1, until you find it...if that is indeed the problem...before you pay the cash to have it worked on.
Posted on Oct 29, 2007
SOURCE: NAD C350
Take a ohm meter and measure resistance from emiter to collector should have a few kilo ohm on output transistor.
If no ohm meter available , remove output transistors from circuit.
note position of transistor . you have a NPN and a PNP for each channel.
Replace fuse and power up. If fuse blows check bridge in the power supply.
80% of the time output transistor burn and blow the fuse.
before replacing output transistors check driver transistors they probably burnt also
Posted on May 04, 2008
It is common for manufactuers to label the fuses on the circuit board as to their values. If they are not labeled there you can try contacting the manufactuer or looking in your manual. You can tell if they are slow or fast blow by the internal wire, if its thin and straight its a fast blow, if its thicker and spiraled its slow blow.
Posted on Jun 06, 2009
Hi, are you saying , the sound is very low?
Are the valves ok and do you have the correct voltage going to the heaters?
Looking at the diagram, are the valve mounted directly to the PCB's, if so go over the solder joints and make good any dry joints.Very common in all valve amps.
Check for any leaking or bulging capacitors, a capacitor checker will come in handy here, just measuring them with a meter is not really good enough..
I am still looking at the schematic, so bare with me as i'n not really a valve person, but i'm gonna help.
Regards - Anthony
Regards - Anthony
Posted on Mar 03, 2010
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