I would advise caution in resoldering the sleeved pins of the 3-500 et al
tubes, for the Eimac spec. and the late Bill Orr, warned that the melting
point of the solder used, could be very close to the temperature which
would destroy the glass to metal seal of the filament pins..........more
effective electrical contact, between the tube filament pin sleeves and
sockets, with more effective directed forced air cooling of the tube base
sockets are the routes to follow.....but this has all be said
before.....regards, John G3JVC.
----- Original Message -----
From: "Steve Thompson" <g8gsq@eltac.co.uk>
To: <amps@contesting.com>
Sent: Thursday, February 08, 2007 12:15 PM
Subject: Re: [Amps] 3-500z - intermittent filament
>
>
> terry@g4amt.com wrote:
>
>> The pins are riveted over on the tube side of the `former` so they cannot
>> (?) be removed; they are of `split` construction. The only way I could
>> re-solder them was to use a solder sucker to extract the old solder - put
>> a
>> couple of drips of flux in the hole and re-solder with silver solder;
>> heating the pin with a mini-blowlamp ...
>
> A question as to what should be used here? There's 'silver solder' as
> used with a torch for brazing. There's also standard pcb solders with
> added silver content to give them a lower melting point than straight
> tin/lead.
>
> Steve
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