Well shoot .... I hit 94cfm ... and yea, its noisy. Im sure the fan noise is
lower at 83cfm...
> From: km1h@jeremy.mv.com
> To: dezrat1242@yahoo.com; amps@contesting.com
> Date: Tue, 31 Jul 2012 14:14:41 -0400
> Subject: Re: [Amps] 3CX1500A7/8877 vs el cheapo GS-35B
>
> Physical Characteristics
> Envelope metal-ceramic
> Cooling forced air
> Minimum required Air flow 2500 l/min (83.3 cfm)**
> Diameter 100.2 mm max
> Length min 173 max 177mm (6.9")
> Anode Diameter min 99.7 max 100.2 mm (4")
> Grid diameter min 59.5 max 60.3 mm
> Cathode indirectly heated, oxide coated
> Cathode Diameter min 40 max 40.5 mm
> Heater Diameter min 25.6 max 26.2 mm
> Weight including copper heatsink 2.8Kg (6.17 lbs)
>
> **Commonly published data shows 1500 liters/min as 90 cfm but that
> conversion is WRONG. The correct data is 2500 liters/min or 150 cubic meters
> per hour which is 83.3 cubic feet per minute. 90 cfm is still a good target
> number.
>
>
>
>
> ----- Original Message -----
> From: "Bill, W6WRT" <dezrat1242@yahoo.com>
> To: "AMPS" <amps@contesting.com>
> Sent: Tuesday, July 31, 2012 12:34 PM
> Subject: Re: [Amps] 3CX1500A7/8877 vs el cheapo GS-35B
>
>
> > ORIGINAL MESSAGE:
> > On Tue, 31 Jul 2012 06:43:47 -0400, Carl wrote:
> >
> >>. I wouldnt want to be in the same room with the blower for one or two
> >>GS-35B's.
> >
> > REPLY:
> > I noticed the specs for the GS-35b don't specify a recommended CFM for
> > cooling
> > but they do say the maximum temp for cathode and grid leads is only 120
> > degrees
> > C. That's pretty low compared to many tubes. A 3-500Z for example is rated
> > at
> > 200 C for those same leads.
> >
> > A builder would be wise to check temps with color-changing crayons or
> > paint.
> >
> > 73, Bill W6WRT
> >
> >
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> >
> >
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>
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