Some high power tube amps do have a ground lift to avoid chassis ground loops. The mesa 400+ does and it works well if you rack it along with something else and start getting ground loop issues.
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Fuzzhead said:Not sure if this was mentioned earlier, but the SVT-VR has preamp out and power amp in jacks, as well as a slave out. Very useful if you want to try your other preamps with this monster power amp. Imagine a V-type or Alembic through it!![]()

The 0x said:The 70s preamps used 12WD7s in the preamp, and also IMHO sounded less muddy than the modern day SVT-CLs.
Now I just wonder if they'll make the cabs out of plywood and sound not as muddy as well...
Could you provide the link?ricplyrz said:The cabs are made out of plywood.
"Like all Classic Series enclosure, the SVT12HE is constructed of rugged Baltic Birch plywood for structural integrity and maximum tonality."
tombowlus said:No offense to Ampeg, but I agree. Even if the head is all that it promises to be, I would still pair it up with a Berg NV cab (while they're still around at least).
Tom.
KingOfAmps said:Could you provide the link?
This seems to be contradicted by an Ampeg employee in another thread right now.
Just so I'll know, would you mine sharing the model number of just one or two cabs that are currently available that are "constructed of rugged Baltic Birch plywood for structural integrity and maximum tonality".Jerrold Tiers said:Not quite...
KingOfAmps said:Just so I'll know, would you mine sharing the model number of just one or two cabs that are currently available that are "constructed of rugged Baltic Birch plywood for structural integrity and maximum tonality".
Any particular engineering reason some cabs are made with Birch and not others?Jerrold Tiers said:The PR410HLF and BXT410HL4 are 18mm birch, for instance.
KingOfAmps said:Could you provide the link?
This seems to be contradicted by an Ampeg employee in another thread right now.
No. This is totally wrongo.Daywalker said:Ok, after seven pages of reading (learning), I've come to the conclusion that the Vintage SVTs are just like the newer CLs...
Daywalker said:Ok, after seven pages of reading (learning), I've come to the conclusion that the Vintage SVTs are just like the newer CLs, but cleaner sounding? If that's true, than I WILL have one, cause that's the only reason why I bought the 4-Pro instead. Also, can you buy the Vintage speaker covers for the 610HLF? If I get the head, the cab's gotta match...
Daywalker said:Well, I have now! Thanks a lot. So, it's a better amp overall then? Meaning, both tonewise and construction? That statement about it being cleaner and less muddy isn't true?