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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> http://lists.contesting.com/mailman/listinfo/amps
>
>
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