[AMPS] Tube question

[Rich Measures]

>
>> BTW, gud deal..only $102.00 matched) one of the tubes went into parasitic
>> oscillation and before I could kill the main power switch it finally
>> killed the circuit breakers.  Now this one tube has a burn spot on both
>> sides of the anode and the tube glass adjacent to it is mirrored.  Does
>> this necessarily mean the tube is  weakened/not matched to the other
>> tube??  I don't have a hi-pot to test them.
>
>Well, it might be good....or it might not.
>
>I have another suggestion. When testing for oscillations, put a large 
>value high wattage resistor in the filament return to the B minus. 
>
>Normally I put a large high wattage lamp in series with the return, 
>just be absolutely sure the insulation is good and the negative rail 
>of the supply is clamped to the chassis through a big protection 
>diode.
>
>Then you can let the tube oscillate while you run for the switch. A 
>good idea is also to FUSE the HV supply for a reasonable current. 
>Fuses, even by the dozen, are cheaper than tubes.

€  Not high voltage fuses.  Are you suggesting that 250v fuses are 
suitable for fusing the anode supply?  



Rich...

R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  


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