[Amps] 3-1000 or 4-1000?(Have air socket available)

[Joe Crawford]

I have an original Eimac air socket for a 4-1000 for a reasonable price. 
E-mail privately.
                                        Joe W4AAB 

Dennis Watkins writes: 

> The 4-1000 has a metal skirt around the base of the tube with
> holes in it.  The 3-1000 is glass over the entire base. 
> 
> Roger Parsons wrote: 
> 
>> Is it possible to tell the difference between a 3-1000
>> and a 4-1000 just by looking? We have one where the
>> lettering is completely disappeared. If it is relevant
>> it has a metal 'base' - which means I can't see which
>> pins are connected.... 
>> 
>> Thanks
>> 73 Roger
>> VE3ZI 
>> 
>>  
>> 
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