I ran a Eimac 4-1000A G-G with 6750 on the plate with a squirl cage
blowing the bottom and a muffin fan blowing across the top seal and
heat sink. No Chimney!...But then those were the days you could by FM
pull outs for 20.00 to 25.00 with the red Eimac paint still showing,
and I was about 20 years old and breadboarded the HV supply with
4-3B28s around the room. Friends would come over and test their tubes
to see what the idle current was to determing how good the tube was
operating.
"Disclaimer" I don't recomment this kind of operation.
Geo - W7LFD
|-----Original Message-----
|From: owner-amps@contesting.com [mailto:owner-amps@contesting.com]On
|Behalf Of Jon Ogden
|Sent: Saturday, May 12, 2001 9:08 PM
|To: measures; W0UN--Signal Hill Ranch; AMPS
|Subject: Re: [AMPS] Nichrome wire and tube chimneys!
|
|
|
|on 5/12/01 10:56 AM, measures at 2@vc.net wrote:
|
|> Heath had a better idea. The Heath SB-220 cooled the tubes with a
|> slow-speed fan blowing horizontally into a split-chassis.
|The diameter
|> of the fan was slightly taller than the tubes - so moving
|air reached all
|> parts of the tubes - including the pins. . I have seen a
|number of
|> tubes that were removed from air-system sockets in commercial
|
|I doubt you could cool a 4-1000A or 3-1000A by blowing air
|across the side
|of the tube.
|
|73,
|
|Jon
|NA9D
|
|-------------------------------------
|Jon Ogden
|NA9D (ex: KE9NA)
|
|Member: ARRL, AMSAT, DXCC, NRA
|
|http://www.qsl.net/ke9na
|
|"A life lived in fear is a life half lived."
|
|
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