[Heathkit] reactivation of a 3-500

[Ulrich Graf]

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
>>> ______________________________________________________________
>>> Heathkit mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/heathkit
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Heathkit at mailman.qth.net
>>>
>>> List Administrator: Duane Fischer, W8DBF
>>> ** For Assistance: dfischer at usol.com **
>>>
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>>
>>>
>>
>