[Amps] Gettering 4CX800A GU74b

[R.Measures]

On Oct 21, 2004, at 3:14 AM, Jason Buchanan wrote:

> Harold B. Mandel wrote:
>
>> After trying out an EMTRON DX-3 and finding it
>> prone to self-oscillation without any neutralization circuitry
>> and susceptible to RF Feedback at 18MHz, (enought to illuminate
>> all the LEDs on the bar graphs, all at once),
>>
>> And in addition to finding a tube socket that was ancient and
>> a 12 year old tetrode in a supposedly "new" amplifier, I wonder
>> what kind of surprises awaits owners of the DX-4?????
>>
>>
>
> Can't comment about the rf feedback setting up a carnival light show 
> on 18MHz but i've seen a few new amps shipped with pretty old tubes.  
> Zillions of these tubes built in the early 90s.  Ray Cronin makes 
> special mention of the warranty going bye-bye if you put another tube 
> in your qrotec amp that you didn't buy from qrotec - they supposedly 
> stoke up the getter and burn them in good and long.
> http://www.qrotec.com/tubewarn.html
>
> IF YOU USE TUBES OTHER THAN THE ONES DELIVERED WITH YOUR AMPLIFIER, 
> QRO TECHNOLOGIES IS NOT RESPONSIBLE FOR ANY DAMAGE CAUSED BY THOSE 
> TUBES. YOUR WARRANTY WILL BE VOID AS IT RELATES TO ANY DAMAGE CAUSED 
> BY THOSE TUBES. YOU WILL BE RESPONSIBLE FOR THE REPAIR COSTS AND 
> RETURN SHIPPING.
>
> THE 4CX800A (GU74b) TUBE MUST BE PROPERLY GETTERED AND TESTED BEFORE 
> USE. THE TUBES SUPPLIED WITH OUR AMPLIFIER HAVE BEEN GETTERED AND 
> TESTED. TUBES SUPPLIED BY OTHER VENDORS HAVE NOT BEEN PROPERLY 
> GETTERED AND TESTED. THESE TUBES HAVE A STRONG TENDENCY TO ARC CAUSING 
> DAMAGE TO THE AMPLIFIER. WE STRONGLY URGE YOU TO MAKE SURE ANOTHER 
> TUBE SUPPLIER GETTERS AND TESTS THE TUBES HE SELLS AND GUARANTEES 
> THOSE TUBES.

Ray --  How does one getter a 4cx800A?
>
> 73s
>
> Ray W. Connin, KB8VU
> QRO Technologies, Inc.
> ...
Richard L. Measures, AG6K, 805.386.3734.  www.somis.org