[Heathkit] reactivation of a 3-500

[Jim Shorney]

The sources that I have read say that the plate needs to glow for the getter to
function. Maybe more current is needed?

73

-Jim
NU0C


On Sat, 17 May 2014 15:18:50 +0200, Ulrich Graf wrote:

>Thanks
>
>to all for helpful hints about the reactivation of a 3-500. Two days of
>running the tube with filament only did not change the behaviour. Then I
>built the test setup of PA0FRI. After a couple of hours the plate current
>settled at 400 mA and 38 V. But the plate did not glow with these values!
>After insertion of the tube into the linear again the plate current still
>increases when I activate the PTT. So probably the tube has drawn really
>too much gas or the test setup must be running much longer or it does not
>work. I'm still confused.
>
>Vy 73, Uli, DK4SX
>
>
>2014-05-16 21:46 GMT+02:00 Ulrich Graf <dk4sx.ug at googlemail.com>:
>
>>
>> Harold,
>>
>> I've been in the States twice but did not visit any ham friends. My visits
>> were very many years ago. I'm sorry to disappoint you.
>>
>> Vy 73, Uli, DK4SX
>>
>>
>> 2014-05-16 18:30 GMT+02:00 N Hairston <k4hca at windstream.net>:
>>
>> Hi,Uli:
>>>
>>> My good friend, Tom Hand, had a German friend named Ulrich who was a ham.
>>> He visited Tom here in the states and Tom visited him in Germany. Could you
>>> be that person? If so, we met once.
>>>
>>> Thanks,
>>>
>>> harold-K4HCA
>>>
>>>
>>>
>>>
>>> On 5/16/2014 5:15 AM, Ulrich Graf wrote:
>>>
>>>> Hi to the list,
>>>>
>>>> got an SB-1000 linear amplifier recently second hand. While activating
>>>> PTT
>>>> I noticed that the bias current is continuously increasing. Bias network
>>>> seems to be ok. So the tube must have drawn some gas. How can I activate
>>>> the getter the easiest way to reuse this tube again? Many hours of
>>>> heating
>>>> do not work.
>>>>
>>>> vy 73, Uli, DK4SX
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>>
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