Pray for me...I just bought a SVT II blind!

I'm using the stock JJ 6550's in my Heritage SVT's and they've been fine.

BTW, full retubes are a huge waste of money. If you have a tube-related problem with your amp, it's almost always just one tube.

 

Did it come from the canton store? If so, i played it a few weeks ago. If thats is it, i spent about an hr with it. Definitely worth the $ they asked. I plug into an ampeg 410, sounded good though i generally felt it seems "weak" for some reason. I believe it was a 4 ohm cab too. I didnt notice any obvious issues with it, maybe the tubes are just old. The morons there nearly fried it, turned it on without plugging speaker in. I quickly unplugged it. The sales guy was a jackass otherwise i probably would have got it i think your good to go, assuming it survives shipping. Its a late 80s version, same as 1 i have a few years ago

 

If everything is working properly, leave it alone.

 

This is the good advice you listen to so you don't have to seek advice on how to fix a mysterious problem that occurred after an unnecessary repair.

 

If the OP is handy with a meter, it wouldn't hurt to check the bias....other than that, I agree; leave it alone!

 

Are you using the bright input by chance?

 

Jimmym was correct when he diagnosed my svt from 3k miles away.

 

I center the tone knobs of my SVT-II non-pro like yours, and hardly ever use the eq.

I hear ya about new strings sounding odd, especially when I'm playing one of my SVT's. Give-em a chance to break in.

What cabs are you using?
I don't typically dig cabs w/tweeters with my SVT's, especially with new strings...

It's probably gonna have way more prominent low-mids than your markbass, so don't be surprised if your band mates say your playing too loud.

 

FYI, the 12AU7s control the bias. To be safe, I recommend you leave the amp off until you have a screw driver and meter handy.

 

Pray for me...I just bought a SVT II blind!

Soap poisoning is a real thing.
You really want to avoid Lifebuoy.

 

Congrats on an awesome amp!
I'm far from an expert on this, but afaik it's best to have matching power tubes, or at least matching enough that they bias correctly. @anderbass @coreyfyfe et al will steer you right.

If your cabs are 4ohm each, you can always use just one of em, which would allow you to push the amp harder, for less overall volume. I do this with my Fender Super Bassman . I often run it into just one 115 cab, which will allow me to get some power tube drive at far less a volume than if im running it into 2x15s or an 810 for example

 

You can also get a serial cable and run both cabs at 8 ohms. Move more air and turn up the amp!

 

Well this might help you...if you want to find flat response, I found pretty close to it with bass 11:00, treble 2:00, and mids 3:00 at 800 hz in most SVT's. Of course, I don't run them that way since I like a little less treble and a little more bass, but I thought that might be of some help.