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Marshall Valvestate 8100 Head volume too quiet in gain channel. Everything else works fine ie clean channel and leads, socket, guitar. 14 yrs old, previously worked fine (within matter of weeks)

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  • wunjo7 Oct 22, 2008

    Thanks Dan

    I cant seem to unscrew the cover because the screws keep rotating when turned anticlockwise. I'm assuming its the metal cage on the left at the back - any ideas?

    Cheers.

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I believe that your model uses a 12AX7 tube for the pre-amp section. The tube is bad and needs to be replaced. Start there.

Dan

Posted on Oct 21, 2008

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Hi, I've a Marshall JVM410H which is connected to a Marshall 1960B cabinet. The problem is I can't take the volume up very much because there is so much distortion - the more I turn the volume up, the...


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It sounds like you have the same rig I do. I bought the JVM410h immediately after it came out. I'm a professional gigging musician, and it had the versatility I needed.
One of the first things I noticed was it's high gain structure. On my JCM800, I could crank the gain to 10, and get a great, "classic Marshall" overdrive tone. The gain structure of the JVM is more sensitive. I find myself not needing the gain knob any higher than 10 o'clock, in the RED modes of the OD channels.
The manual is very informative, though somewhat complex. I recommend watching this tutorial on it:
http://www.marshallamps.com/product.asp?productCode=JVM410H#
Click on the "THEATRE" link on the right.
I love my amp, but it's been in the shop twice already. Marshall's are known for being unreliable, and this is amp is in no way an exception. Be gentle with it! It's moody.
Best of luck, and I hope this helps!

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Ask yourself this: who ever really turned the volume knob up to maximum on any amp on purpose, and had speakers survive it? In other words, why have all that capacity on a potentiometer if you never use it?

Little known fact: With that in mind, Bose Corp actually designed a product that intentionally used the full physical travel of a volume control - the Bose Acoustic Wave Music System.

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Hi Andy

The problem you face is most probably the same that stops most all valve state amps from working. They suffer terribly from fry/cracked solder joints. You will have to remove the main circuit board from the chassis, and resolder any suspect joints you can see, particularly about the rear loop in out jacks, control pots on the front panel, and power supply. There is a large power resistor and zener diode that cause problems in this model from memory. The valve never fails in these amps. Due to the lower supply voltages they are run at, they are not under alot of pressure, and as such give good reliable service. Go over the amp for dry joints first, and see how you get on. I have repaired so many of these with that problem.

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robotek

Nov 07, 2008 | Audio & Video Receivers

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Hi, I have a Tascam 144 when i plug my guitar through an amp into it, it only seems to record on one channel IE it only comes out of one speaker, I can get round this by taking a lead out of the sub out...


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I have a phonic powerpod 740plus and have connected it to 2 100volt line transformer to 12 toa 30watt speakers when i turn it on it make a humming noise and when i plug in xlr mic leads which i have made...


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Please let me know and we can go from there.

The loud screeching noise you are experiencing, may be too much gain. Start with everything turned down, and work your way back setting levels to about 5-6 from the master level first. The channel gain at the top of each input strip should be you last adjustment.

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robotek

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Hi i use a peavey 6505 Amp head and when i run a seymour duncan pickup booster through the effects loop it blows the amp (possibly the pre-amp fuses) i want to get a volume boost in a distorted setting...


Hi bmwz43

Odd that you keep blowing the head... and with 5 12axl preamp tubes even more surprised that you cannot get enough gain... :) Get the correct pedal for the 6505 and change yo levels that way. Hard to beat classic tube amp for tone:)

Check the the amp has the correct impedance setting for the quaddy you are using.

One more thing, what sort of cable do you have connecting the amp to the speaker box. If you use a cheapo guitar jumper lead arrangement, expect that to give you trouble AND **** tone. The 6505 has 120watts of cranked up tube output. Tube output stages need a solid at least 18 gauge cable and quality connector jacks, like Switchcraft. They can blow fuses if you don't use a decent speaker connector lead.

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