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In Reply to: Re: What's the best way to isolate a tube amp? posted by Mike Bates on May 26, 1999 at 15:52:16:
I have a VTL ST85 and previously have it sitting on concrete blocks.
Ok, no tire underneath but once I use cones to decouple it from
the block all the high are smooth as silk now. Bass also
improve. I suspect that even if you put inflated tire beneath
it the slab, it still rings like hell from the vibration coming
thru the air.Perhaps even better result can be achieved by combining the
the tire and cones???I heard people said they have excellent result in using cones on
Seismic Sink...
> I have a VTL ST85 and previously have it sitting on concrete blocks.
> Ok, no tire underneath but once I use cones to decouple it from
> the block all the high are smooth as silk now. Bass also
> improve. I suspect that even if you put inflated tire beneath
> it the slab, it still rings like hell from the vibration coming
> thru the air.Not in my findings, the inner tube(not a tire) really does a good
job in damping, decoupling, or absorbing resonance from the patio block.
> Perhaps even better result can be achieved by combining the
> the tire and cones???I agree, the highs do sound more natural and refined with DH ceramic cones beneath them vs. just using the feet that come with the equipment. The DH cones also in my listening take away another layer of haze from the whole sonic picture.
I should also mention I use the patio blocks with tubes under a CD transport, tubed d/a convertor and tubed preamp. All with DH cones of course. My turntable actually sounded worse with the block/inner tube combination. It is a SOTA Star, the bass is much tighter and extended without the DIY combination. This may not be true for other turntables. SOTA really did their homework in tuning the table's isolation system and the inner tube system made it unstable.
I do however use a combination of a patio block with 4 large DH cones under it, then a 1/2" layer of Mortite sandwiched between it and another patio block as an isolation base for the SOTA turntable. This combination really gives the turntable a nice non-resonant foundation to sit on and do its thing. The table comes with some nice sorbathane "feet". I tried brass cones in their place and felt it was a step backwards from the factory "nirvana" tuning.
> I heard people said they have excellent result in using cones on
> Seismic Sink...
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