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Author Topic: variable speed drive for blowers  (Read 1490 times)
NORTHCOUNTRY
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Posts: 358




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« on: October 24, 2006, 05:56:57 AM »

I have been studying amps and have seen that a common issue is blower noise from single speed blowers.  I seen the mods that add thermostatic switches that convert the blowers to two speed but has anyone considered variable frequency/speed drive for the blowers that could hold the exhaust temp to an exact temp and only supply air at the required cfm and not more.
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WB2WIK
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Posts: 21836




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« Reply #1 on: October 24, 2006, 08:03:31 AM »

Sure, lots of people have done this, it's a fairly common mod.

However, after doing it most realize they didn't gain anything because when you transmit, the blower will kick up to full speed, and it will stay there for probably 10-15 seconds after each transmission, in effect creating about the same "noise" as just letting it run full speed all the time.

If acoustic noise is a true concern, go with tubes that use low-pressure cooling like 3-500Zs (AL-80B, etc).  They can be (and usually are) cooled by ordinary low-speed axial fans that make almost no audible noise at all.

WB2WIK/6
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