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@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of K8MLM@aol.com
Sent: Thursday, October 19, 2006 6:52 PM
To: bmaser@tampabay.rr.com; k7rdx@charter.net; ka1xo@juno.com;
amps@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@tampabay.rr.com writes:
Blow air down thru the fins from up on top.
Bob W6tR
----- Original Message -----
From: "k7rdx" <k7rdx@charter.net>
To: "Harold Mandel" <ka1xo@juno.com>; <amps@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@juno.com>
> To: "'k7rdx'" <k7rdx@charter.net>; <amps@contesting.com>
> Sent: Thursday, October 19, 2006 8:07 AM
> Subject: Re: [Amps] Testing amp with no air flow
>
>
>>
>>
>> -----Original Message-----
>> From: amps-bounces@contesting.com [mailto:amps-bounces@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]
>>
>>
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
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