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Replace rp7 valve tube - DIGITECH Music

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Hi there, and thanks in advance for any help you may give. I find my Peavey Delta Blues either EATS valves or the valves come loose, though I haven't moved it so that doesn't seem likely. I put new...

DO NOT run on less than the full set of valves!!! ALSO when replacing the valves with matched pairs used the matched pairs to replace either the inner two or the outer two. If they come loose, the sockets probably have pins that are loose. Sometimes they can be tightened a little using a sharp scribe to bend them gently inward. I would consider installing tube retainers. They are made as a wire springs. Go to this site:

Click on "Vacuum tube Accessories"

May 25, 2011 | Peavey Delta Blues 115 30w All Tube Combo...

3 Answers

I have distortion on my clean channel I have changed the speaker but still same problem

Look at your indicator LED... is it off for the clean? Does it show yellow for drive and red for more?
Depending on if this LED is showing these correctely tells me where to look for problem. If the LED shows these correctely, then problem is with the relays that do the switching or a few transistors that change the gains for the drive and more functions.

May 04, 2011 | Fender Hot Rod Deluxe Guitar Combo...

1 Answer


Check for intermittent connections of cables. The vibration of turning it off and on MAY be fixing a poor connection. Verify the problem exists using new cables. Intermittent problems are tricky to find so we have to do tests to narrow the possibilities.

Apr 25, 2011 | Roland Boss Gt-10 Guitar Effects Processor...

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My Epi valve jr v3 burns up jj el84 tubes, but the solvteks work it the amp or the tubes?

Check the bias on the tubes! Some brands can run with bias set wrong. Also some amps have 4 output tubes and people don't know that MATCHED pairs have to be seperated to each side of center of the group of four tubes.
You probably only have a single EL84 tube in your unit.
I could not find the schematic for this unit... IF the plates of the EL84 are coloring, the bias is set wrong. The plates should remain BLACK and not coloring to dull red or orange. Telling if the tubes are "burned up" can only be done with a tube checker or electronic test equipment or by seeing a bright purple glow between the elements.
Now this is supposedly only a 5 Watt unit so that means it is for LOW volume practice only... If you overdrive this small amp you can PROBABLY burn almost any tubes you put in it. The sound you can expect out of this will not be louder than most of the consumer boom boxes at full volume.
If you overdrive and "flattop" the unit the power tube will overheat and fail... this amp runs the tube in "Class A" which makes failure under overdrive more likely than in Class AB or B. I can't go into the engineering details other than to say at volumes above the design the output transformer will saturate and the tube will have to dissipate way above its ratings.

Feb 12, 2011 | Epiphone Valve Junior Tube Amplifier Head

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Chances are that one of your tubes (valves) has failed.
If your amp is still in manufacturers warranty take it back to the place where you bought it.
Otherwise you need to identify which tube has gone and replace it. This will entail gaining access to the inside of the amplifier case. BEWARE this can be VERY DANGEROUS if you don't know what you are doing.
Always disconnect from the mains electricity supply before dismantling.
Once you have got the case off you will need to plug the amp in again and turn it on - you don't need to plug a guitar in just the mains supply. TAKE GREAT CARE not to touch any metal parts.
Look at each of the valves (there are some on the pre-amp stage behind the front panel as well as on the main amplifier chassis) they should all be glowing a nice bright red colour in the middle if they are healthy.
If any valve is not 'lit up' that will be the faulty one. DO NOT TOUCH IT - apart from the high voltage electricity associated with them valves get very HOT.
Turn the amp off, unplug the mains supply and WAIT at least 10 minutes for it to cool down again. Carefully slip the metal retaining spring off the top of the valve and, gripping it with a tissue or soft cloth, gently pull it out with a slight rocking motion. Carefully note down all the numbers and letters on the valve to identify the correct replacement. There are literally hundreds of different valves - putting the wrong one in may cause further damage to the amp.

Feb 02, 2011 | Fender Hot Rod Deluxe Guitar Combo...

1 Answer

I got a pretty good deal on a digitech RP7. The only problem is that its missing one of the four switch covers (pitch). can you tell me where I coul find one? thanks,

Such a special part will require going to Digitech, support, and parts. The part should be fairly inexpensive.

Jan 04, 2011 | Music

2 Answers

My amp is making a high pitch noise almost like feed back. I only use the clean channel.When I tryed the other channel it is not working at all. Bad tube?

Bad tube? maybe
Try removing each tube 1 at a time starting at the first preamp (12ax7) If the noise stops after a particular tube is pulled replace that tube with a known good tube. Shut down the amp between tube pulls, Power tubes don't usually cause this problem but I'd pull them anyway,just remember they get very hot.
Make sure all tube shields are on and replaced after tube pull test
The most common cause of oscillation is a open or leaky filter cap,this would require a cap job and unless you have a good knowledge of tube electronics and the voltage dangers present,I wouldn't suggest doing it yourself.
Also if the output transformer was replaced or rewired or the negative feedback circuit was touched oscillation could occur also.
Make sure your guitar cables are in good shape, a cable with a bad shield can cause problems too.
Excessive noise can occur when one of the 1/4" input jacks shorting bars doesn't make contact to ground. A duumy plug would confirm this but you could also plug two guitars with good cables, into each input and see if the oscillation disappears.
Hope this helps

Nov 13, 2010 | Fender Hot Rod Deluxe Guitar Combo...

1 Answer

What is the position of each valve on the Marshall JVM410C chassis? I assume the one with the screen can is V1 but does it run from right to left from there for V2, V3 etc?

It doesn't matter. It takes 5 ECC83 tubes which have a smaller tube socket than the output tubes. The output tubes are 4 of EL34. If this helps please rate me.

Feb 23, 2010 | Marshall JVM410C 100 Watts Valve Guitar...

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