[AMPS] Amp using 833A

[measures]

>
> 
>>    I don't think anyone has done any calculations:
>> I used to run a pair of 250TH's in parallel grounded grid in the 60's. I
>> then did not know that it would n0ot work since the mu was only 37 or so.
>> They worked fine driven by my home brew pair of 6146's and my 20A exciter.
>>    Now the 833 has a mu of about 35. Indeed you can't operate it at zero
>> bias and the input impedance is  higher than 50 ohms and power gain a bit
>> low. 
>
>Everyone keeps talking about "mu".
>
>Why?

Because in g-g config., the lower the Mu the harder to drive.  Because in 
grid-driven config., the higher the Mu, the lower the peak anode current. 
 In grid-driven linear service high-Mu triodes produce little power.   In 
my opinion, a real amplifier expert would know this.  
>
cheers, Tom.  


-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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