[AMPS] 3-500Z chimneys

[Steve Thompson]

In message <19990302.202354.-7749.9.km1h@juno.com>, km1h@juno.com writes
>
>
>
>On Mon, 22 Feb 99 09:16:36 -0600 Jon Ogden <jono@enteract.com> writes:
>>
>>>
>>>I have a need for several 3-500Z tube chimneys. Reportedly Coleman 
>>lantern
>>>globes can be used. Has anyone tried this?
>>>
>>>Sure beats paying $40.00 per unit from RF Parts.
>>
>>Lane,
>>
>>I've heard people suggest this before. 
>
>Maybe old hat since I was away for a week but the Coleman glass is not
>the ideal choice for a chimney. Yes, they usually work OK with the
>4-400A/3-500Z type tube but a real chimney is compounded to be neutral to
>RF.  The lantern type glass has a poor radiation xfer. It really becomes
>a problem with the 4-1000A size bottles.
>
Earlier I mentioned a friend who successfully used lantern glass and
PTFE sheeting as chimneys - in view of Carl's comments I'd just clarify
that these were used with forced air cooling from a small snail blower.

Steve

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