[ARC5] Powering an ARC-5 Receiver After Long Storage

[J. Forster]

I intend to use the HP 6209B Power Supply. It is regulated and has
adjustable current limiting.

-John

===============



> On 05/21/2014 10:27 AM, J. Forster wrote:
>> The only risk I see is possibly overvoltaging a capacitor connected to
>> the
>> tap on a resistive divider, where that tap also supplies tubes. An
>> example
>> is a decoupling network for prior stages in an amp.
>>
>> My reason for doing this is to test (and reform) bypass caps with no
>> current through the tubes.
>>
>> Of course, if a tube is badly gassy, it could break down.
>>
>> It seems to me, the B+ test is an easy overall health check. I bought an
>> HP 6209B Power Supply a while ago for this purpose.
>>
>> -John
>>
>>
> Hi,
>
> I remember something about some types of transmitting tubes with exotic
> chemistry that shouldn't be energized that way - for long periods of
> time. Receiving tubes don't seem to have any trouble with that. For the
> testing long idled gear you might consider some current limiting so as
> to limit or completely avoid smoke and destruction in case some ancient
> part fails.
>
> With my command receivers I have started with as little as two 9 volts
> batteries in series and worked up from there. With the heaters on they
> will try to work with that low voltage but they won't wprk very well.
> They start to perk up around 45 volts - five of those batteries in
> series and seem to operate full bore at 90 volts. The batteries
> themselves might be sacrificed in a hurry in case of a catastrophic
> failure but there wouldn't be any smoke or flames. Those die right away
> with a short applied. Temporarily inserting a small fuse in the circuit
> will probably give the most protection for the expense and effort. I
> like solid state current limiters. Add a meter and you will know what is
> happening right away. That's probably not worth the effort for "once in
> a while".
>
> 73,
>
> Bill  KU8H
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