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[AMPS] Henry 2kd classic

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Subject: [AMPS] Henry 2kd classic
From: (2)
Date: Fri, 14 Sep 2001 12:53:24 -0700
>> Any dowside risk to gutting the grid cap/choke circuit in the L-7 and
>> replacing them it Cu straps between the grid terminals of the socket
>> and chassis? 

//  When the grid's intrinsic inductance is grounded through the positive 
reactance in a Cu strap - insead of the negative reactance in a cap. - 
the grid-resonance frequency decreases a bit,  which should permit 
oscillation at a slightly lower frequency.  The grid-resonance change can 
be measured with a dipmeter.  I would be interested in your measurement.  

>>Will this affect the termination impedance that the tuned
>> input sees significantly?
>There are always risks when we change things in marginally stable 
>systems unless you just buckle down and do everything correctly.
//  Amen to that, Mr. Rauch.  

>If I owned a 30L1 I'd use "cathode" bias and ground the grids 
>normally, and add neutralization.

//  Art Collins knew better than to try this.  

 > I'd never use four 811A tubes in 
>parallel without cancelling feedthrough capacitance.

//  The sticky-wicket.  

>73, Tom W8JI

-  R. L. Measures, 805.386.3734, AG6K,  

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