[ARC5] BC-453 mods

[J. Forster]

I've seen two transistor versions, a FET and regular transistor, coupled
together, used.

-John

================


> FYI.  A JFET is not a triode  It does have a "triode" like region prior to
> pinchoff, but beyond that Vds bias point the current saturates like a
> pentode.  The pinchoff voltage is low enough that it is rather impractical
> ficult to run it as a triode in most cases.  But it's a good sub for a
> pentode and you don't need any "screen" voltage.  The biggest limitation
> is
> the max operating voltage.
>
> Dennis AE6C
>
> On Sat, Aug 6, 2011 at 9:50 AM, Kenneth G. Gordon
> <kgordon2006 at frontier.com>wrote:
>
>> Making the 1st IF regenerative in any of the models is easily done,
>> and makes a big difference for weak signals....not so much for strong
>> ones.
>>
>> Two pieces of #12 TH or THHN (with insulation still on) soldered to
>> the grid and plate terminals, and a pot in the cathode is all it
>> takes.
>>
>> The main problem I always had when trying to replace tubes with FETs
>> is that an FET is basically a triode. For multi-grid tubes, this is
>> often a real problem.
>>
>> For triodes, not so much.
>>
>> I have a pair of Tubesters here which I took out of a Heathkit VTVM.
>> As I remember it, one replaced a 6AL5 and the other a 12AX7.
>>
>> vy 73,
>>
>> Ken W7EKB
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