I used stacked muffin fans on a 4 x 4CX250 amp, and one fan wouldn't
get the job done. Two worked great, and three didn't seem to be
proportionally better.
Don WA4NPL
Quoting vk3pa@vk3pa.com:
> Quoting James Colville <jimw7ry@gmail.com>:
> EMTRON uses 2 fans one under the tube blowing es the other a pc type
> fan on top
> sucking..
>
>
>> Fans in series? How are you going to figure the airflow out? Just use a
>> single BLOWER like 100% of the other amp builders use? What tube or tubes?
>>
>> 73
>> Jim W7RY
>>
>>
>>
>> On Mon, Jan 25, 2010 at 12:28 PM, MIKE DURKIN <patriot121@msn.com> wrote:
>>
>>>
>>> Ok, yea its not for VHF, Just HF but was thinking about parasitics and all
>>> ....
>>>
>>>
>>>
>>> Next thought is there a rule of thumb when stacking fans back-to-back to
>>> figure CFM and pressure ....
>>>
>>> Like if i had 2 fans with 98.1CFM/0.28" blowing in series?
>>>
>>>
>>>
>>> Mike
>>>
>>> KC7NOA
>>>
>>>
>>>
>>>
>>> snip>
>>> > Hi Mike,
>>> >
>>> > > I'm wanting to supply the tube on one side of the tube and put the
>>> blocking cap for the C.L.C. output
>>> > about 110Deg off around the tube. Will that make for any internal issues
>>> ETC. from
>>> > misbalance on the Anode ??
>>> >
>>> > If I understand you correctly, looking down at the tube, the HV supply
>>> (connection to
>>> > the anode RF choke) is at 12 o'clock, and the blocking capacitor to the
>>> output tank
>>> > comes off at about 4 o'clock (or 8 o'clock). If that's what you mean,
>>> that should be
>>> > fine. (Unless you're working at VHF or UHF frequencies... then I don't
>>> have a clue as
>>> > to whether it's OK.)
>>> >
>>> > 73,
>>> >
>>> >
>>> >
>>> > George T Daughters, K6GT
>>> > CU in the California QSO Party (CQP)
>>> > October 2-3, 2010
>>> >
>>> >
>>>
>>>
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