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In Reply to: RE: There is always the VIBRAPLANE posted by xaudiomanx on August 25, 2014 at 16:28:00
Why go to all that effort ? All I do is add a bit of damping sheet to the top plate , suspend the valve socket on grommets and back off the filament volts , this tends to reduce microphony . The older types , especially globes or types with filament hangers tend to be a lot more microphonic . I recommend avoiding globe 26 for this reason
Al
Follow Ups:
The filament voltage was set just below the 1.5 with the filament bias. Even though globes are beautiful, truly NOS ST tubes will fix the issue. Hard to tell with the globes how much use they really had. People used to leave their radios on constantly. STs still sound very good.
I had no trouble getting my ST type 26 quiet , the globes I used tested as new but were prone to hum and were very microphonic . I could clap my hands next to the valves and there would be a quiet 'poiiiinnnnggg' through the speakers that lasted about a minute . Sold the globes to a man in HK who loved them...
Al
I think they sound fuller and a bit warmer than the ST. I have no problems with microphonics, but the mounting scheme I use is a bit extreme (see above for pics).
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