[Amps] Testing amp with no air flow

[K8MLM at aol.com]

There is an easier way.  Attach the shop vacuum to the top of the tube  and 
work on the bottom side.  That's how I did some under side work on  my Alpha 
77.  But in this case I hooked the shop vacuum to the exhaust  port on the back 
of the AMP.
 
Bob
K8MLM  
 
In a message dated 10/19/2006 3:32:25 P.M. Eastern Daylight Time,  
bmaser at tampabay.rr.com writes:

Blow air  down thru the fins from up on top.

Bob  W6tR

----- Original  Message ----- 
From: "k7rdx" <k7rdx at charter.net>
To: "Harold  Mandel" <ka1xo at juno.com>; <amps at contesting.com>
Sent: Thursday,  October 19, 2006 3:06 PM
Subject: Re: [Amps] Testing amp with no air  flow


> Hal,I think you are stretching things a bit far  out...Jim..
> ----- Original Message ----- 
> From: "Harold  Mandel" <ka1xo at juno.com>
> To: "'k7rdx'"  <k7rdx at charter.net>; <amps at contesting.com>
> Sent: Thursday,  October 19, 2006 8:07 AM
> Subject: Re: [Amps] Testing amp with no air  flow
>
>
>>
>>
>> -----Original  Message-----
>> From: amps-bounces at contesting.com  [mailto:amps-bounces at contesting.com] On
>> Behalf Of
>> Dear  Jim,
>>
>> It's a question of economics and  habit.
>>
>> If you feel confident in powering up  ceramic
>> devices without any airflow you are the one
>>  who footed the bill.
>>
>> The whole idea of the airflow  scenario is that is the tube's
>> normal operating  environment.
>>
>> 8877's are about $1,000.00 these days,  yes?
>>
>> I would think twice about powering any ceramic  triode up
>> without airflow going, just as seriously as I  would
>> think twice about immersing our tomcat in a sink full  of
>> warm, sudsy water for a shampoo.
>>
>>  Hal
>> W4HBM
>>
>>
>>
>>  [snip]
>> I just checked fil voltage on my 8877 here (No blower )  watched it 
>> ramp-up
>> to 4.9vac in less than 10 secs and  then pulled switch...No heat felt on
> tube
>> base in this  short time interval...What`s the big deal unless you want to
>> test  with rf conduction?(I do that too but with blower running&safe
>>  connections) Jim K7RDX.
>> [snip]
>>
>>
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