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How do I change the valve on a Marshall vs 65r amplifier

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Remove the amplifier unit from the chasis and just change the preamp tube with another 12AX7. they do not need to be biased

Posted on Feb 25, 2015

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I have a fender frontman 65r with a 8ohm speaker can i add another 8ohm speaker to this


http://cie-wc.edu/Series_Parallel_9_14.pdf
Not recommended.
you could add 3 more 8 ohm speakers in series / parallel wiring and keep an 8 ohm load to the amp, or
2x 4 ohm speakers in series, or
2x 16 ohm speakers in parallel

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Hi, I bought a Frontman 65R a couple of years from now, but last month I've moved to South America and I forgot to buy a Voltage transformer to use with the amp. (It changes from 110 volt to 220...


the fuse hopefully took the brunt of the higher voltage,, replacing the fuse should do the trick, but yes you need the voltage transformer for sure they sell them pretty cheap here, Just be sure and look for the wattage in each one http://www.dvdoverseas.com/store/index.html?loadfile=catalog6_0.html

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The valves on my Marshall TSL 122 are getting to hot.What might be the problem? Can you get me the scheme for that amp?


Probably the bias is set wrong... Please note that when installing MATCHED pair tubes, the tube pairs usually go at opposite ends of the strings, that is one on either side of the center of a set of four.

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I have just bought a used Marshall VS65R. When I


Make sure that when the audio from the speaker cuts, the headphones are still working (try it several times). If this is correct the problem isn't at the preamp or driver tubes. Try to locate the wire that is connecting the speaker with the amplifier. There must be a bad connection at this cable or at the speaker's coil itself. Try hiting with a solid tool (the back of a screwdriver for example) the parts and the connections (not the tubes, just the mountings) while the amplifier is working in order to locate a loosing contact. Once you find it use a soldering gun to fix the connection.

In case of a problem or clarification, don't hesitate to post.

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I need the schematics for a Marshall MG30DFX guitar amplifier in order to repair it.


If you still want the schematics for the Marshall MG30DFX Steve I have them and can email them to you if you want

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