[Amps] Testing amp with no air flow

[Robert B. Bonner]

OK so here's what we've done to provide potential ways to safeguard the
tubes and tweak the bottom side.

1. Wife's hairdryer at base or fins running on cold.
2. Wife's vacuum / shop vac sucking through the anode.

Hey honey hold this right here don't move, don't speak. You don't want your
vacuum melted do you?  Might be the only 5 quiet minutes all day.

3. Clear plastic base with holes through it.
4. Plastic bag over bottom, (I thought this was marginal)
5. Gas Leaf Blower at full throttle.

In all cases the sane heads conclusion say don't just fire it up.

The guys with way too much money say do whats necessary and put the thing
back together. 

Next topic.

BOB DD


-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of K8MLM at aol.com
Sent: Thursday, October 19, 2006 6:52 PM
To: bmaser at tampabay.rr.com; k7rdx at charter.net; ka1xo at juno.com;
amps at contesting.com
Subject: Re: [Amps] Testing amp with no air flow

 
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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