Like I said don't take it personal. 

What I expected was some help.  If you really were concerned with helping someone you could take just a little bit more time and explain things.  Believe me I looked over the schematic for hours after you said "Read the Schematic"  I even posted the voltage readings that I found...  Yes you called me out because I asked if I should have found a negative voltage on the tube socket...   

Look I'm not here to argue or point fingers.  The point I was making is: You have a tremendous amount of knowledge and I don't!!!  Why are you so aggressive and angry?  If you really wanted to help me you know you could have???  But you choose to take a different approach...  Maybe you had a bad day? Maybe your sick of dumb questions? I'm not sure what it is but I am sure that you could have made this experience a better one.

If your going to take the time to respond to a post, try and help someone not make them feel like a dummy.

We all live here on this place called earth.  We should be kind and compassionate.  Not rude and condescending.

I could sit here all day and give you examples of the point I'm trying to make.  Maybe you can think about what I'm saying and leave it at that.  I said Thank you for the help that I did get.  Out of all the people I really didn't want to argue with you because your probably the most knowledgeable person on this site and a couple others that I looked at and read over the last couple of weeks Enzo.  It's not the first time I've seen your name.  Believe me I read a lot of your post and sometimes you try and help and sometimes your a DICK. LOL

I learned a lot about reading a schematic, Capacitors, Circuits, the components that make up an amp.  I don't understand all of it.  I probably got Lucky with my fix.  But like I stated in the earlier post the amp sounded great a couple weeks ago.  Then in a matter of seconds it sounded like crap.  In my mind that probably means something failed.  That's why I assumed it was a component.... 

Have a Good day and maybe, just maybe when you make your next post you will  think about what I'm trying to say.  I'm not saying because it makes me feel better I'm saying it because maybe the next kid that ask a question, could possibly get a little help instead of being made fun of or feeling like a dumb *s!!t* for asking...         

Just wanted to let everyone know that after watching countless hours of youtube videos like D-Lab I was able to figure out how to test capacitors for leakage.  I thought that was what this site was about???  Experts trying to help folks with less knowledge.  I guess I was wrong about that..  Because the only thing that anyone said to me was read the schematic.  Just letting you know if you don't have any experience doing that it is a lot easier said then done.  I originally suspected the caps being bad and ordered new ones and someone on this site said that's like replacing you radiator when it only needs a new cap.  Well that might be true but for about $6.00 It sure is nice to have the piece of mind knowing that I replaced parts that can and usually do go bad after forty years..  Even if it's not bad.  Big deal I spent $6.00.

Maybe some of you experts will realize that not everyone has as much experience as you do and if you really read the post you could take just a little more time to help someone out.  Don't take it personal but if your going to respond to someone's post it only takes a little more effort to really try and help them instead of ridiculing them and/or trying to make yourself sound so smart...  Think about it???  Thank you to everyone that tried to help me.   

Oh yea, after replacing the one capacitor that I originally suspected the amp worked.  I went ahead and replaced all of them and it has been working fine all day.  I hope that was the only problem.  Because getting any real help is next to impossible...   

I cleaned out the tube sockets with contact cleaner.  sprayed a little deoxit in each socket and pulled tubes in and out several times. 

Now when I turn the amp on I hear a Humm that goes up in volume then back down after a couple seconds when I turn the amp on.  The amp is quiet after that.  When I strum the strings on the guitar I can hear the guitar but it also has a crackling kind of distortion along with it. 

The LED's are working fine the red one comes on with power switch and the green status LED comes on when I switch the stand by. 

To be honest when I look at and study the Schematic I have a hard time comprehending it???  I have been able to locate both negative and positive DC voltage on the pre amp side.  I did notice that the positive is around 15.60 vDC  and the negative is a little higher -16.36 vDC. 

Maybe information will help someone with more experience than me???   

Probing around on the tube sockets I can't locate a negative -15 volts DC.  Pin #5 has +15.35v on both tube sockets.  Should the tube sockets have a negative voltage?

Okay I used some deoxit  on the terminals of the Tube or Valve.  I worked the tube in and out of the socket and NO difference is the sound.   It still sounds like s*#t= crap !!!  So I put two brand new tubes in the Amps and same thing    I sat and watched about 30 YouTube videos on reading schematics today and really none turned the light bulb on???  for me...     I know that the transformer takes AC power and turns it into DC.  Power = Voltage.  How do I verify that the amp is getting the -15 and the +15 volts that I see on the schematic?  I think I should attach the black lead to ground or the chassis and what terminals or pins do I need to touch? on the tube socket?  to find the tubes are getting the proper power???

If you think you can help me please let me know???  IF YOU THINK THIS IS A LOST Cause  THEN PLEASE LET ME KNOW. 

As far as the terminology goes No I really don't know as much as you...  If anyone really wants to help and see what I know and what I don't know you can call me at 321-234-9745.  If I do not answer that's because I drive a tour bus and sometimes it's tuff.  Just like the music world today.  If your really in to music you'll know what I'm talking about.  I work just about all year long.  Artist include:  Jackson Brown, Joan Baez, W. Nelson, TRHCP, Neal young, and many, many, more....  I can't really bother other tour members because we all have a job to do.  SO LEAVE A MESSAGE AND WE CAN FIX THIS GOD DAMN AMP!!!   I'm NOT A ROBOOT AND WOULD REALLY LIKE TO LEARN!!!!  MAYBE I COULD HELP YOU I???

Cool deal Phatt Phil!!!  I'm away from the house for the Holidays but will be back home in a couple of days.  I really want to say Thank you for taking the time to give me a hand.  I cant say thanks enough!!!   That goes to everyone that is willing to give me a hand.  Thanks also  galaxiex for getting the Pic's posted on this thread.  It's really a cool thing when others with much more experience and wisdom are willing to share valuable information..  It must be the holiday magic everyone is experiencing.  LOL

I'll post my results and/or questions as soon as I get home. 

                                                       Merry Christmas

Yea!!!!  Thanks blackcorvo that looks like it worked.  As far as the parts I've ordered I think I've spent less than $20.00.  I think just having the peace of mind knowing that parts that are close to forty years old are new know.  I'll feel a lot better when I go to a GIG and plug the Amp in...  LOL

Correction:  The (2) new JJ 6L6 tubes cost $35.00 plus the $20.00 for transistors and Caps.

Let me know what I can do to (or how to) check components???  like checking voltage at specific points on the board.  AC or DC   or resistance = Ohms   Continuity = Beep.....   

See I know a little...   AC/DC  I love that band!!!!!    Just kidding around.....

I hope someone can give some help and guide me thru the technical stuff?

https://imgur.com/a/Ou4mB

I hope this works.   

Well I keep getting an error message when I try and post the PIC's??   But after looking at the picture of the capacitor with the split ends.  No the large caps on this board are okay on the ends but the cover or wrapper has a split running long ways.  Not sure what your opinion is but after almost 40 years couldn't it go bad because of age?  Or because I see the split some other component caused that to happen?  If you send me your Email address I'll send you pics thru email...

I'm at:  BrantQuick@gmail.com

Not sure why???  I'm following direction but I can't get the pics I just took, saved, added as an attachment, to post...

FYI  Both boards are still in the chassis.  I thought it may be a good idea to keep them in until I receive the parts I ordered and if any testing or probing needed to be done...

After many years of sitting around I finally powered up my Peavey VXT Classic.  I acquired it along with a 1966 KAY Truetone Guitar for the amazing price of $25.00.  Anyway after God knows how many years of not being used I fired up the amp and she sounded Great!!!  I do not have the foot pedal so I used the dirty channel but really kept it as clean as I could.  Just at the point if I rolled my volume down on my guitar she would be fairly clean & and if I cranked the guitar up to 11 the amp would break up.  I was really impressed with the tone and it had a mile of headroom.

Well that didn't last very long.  Maybe a couple of hours over several days.  Two days ago I noticed that the amp started to sound like it had some type of effect on the lows like a octave shift or something that lasted about as long as took me to walk over to the amp and really give it a listen.  Then it developed a static-Distortion my guitar was still audible but it had a hell of a lot of noise along with it.  I plugged the guitar in to the return and it does the same thing.

So I spent most of yesterday reading the old inter web and came to several conclusions: I downloaded the Schematic.  I ordered 2  100 uF 350V Axial Electrolytic-Illinois Capacitors, Several Audio driver transistors (MJE  15030) for Q7 & Q8, 2n3904 transistors for Q4 & Q5, and a new set of tubes.  After looking at the board it looks original and for an amp that was made in the early 80's I thought that was good.  The large Caps on the power side have slight splits in the cover of the cap.  Other than that it looked okay. 

I really don't have a lot of experience with electronics other than a couple of soildering jobs with cold joints and an upgrade I did on my Epiphone Les Pual.  Upgrade included: SD Humbuckers, CTS pots, Orange Drop Caps, Switch Craft switch, and 50's style wiring.

My question does anyone know of a procedure I can do with your help that would or could possibly pinpoint the problem?

Like I stated earlier.  I don't have a lot of experience but I'm no dummy!!! LOL...   I have a Fluke 26III True RMS Multimeter  & Fluke 12 Meter & quality Wells soldering gun.  So I'm pretty dangerous with all that equipment......   LOL   

Please Help if you have knowledge and Patience?