[Amps] Plate choke explodes

[Carl]

There shouldnt be a problem with a Z-50 as they are self resonant around 70 
MHz. OTOH they may explode if subject to a shorted tube or a wild parasitic 
but the 8877 is not a parasitic prone tube in a decent layout.

Carl
KM1H


----- Original Message ----- 
From: "Dick NY1E" <dick at ny1e.com>


I've used an Ohmite Z-50 for a plate choke in my 6M 8877 since 1999, no 
smoke yet.

Dick, NY1E


ORIGINAL MESSAGE (may be snipped):
On Fri, 12 Apr 2013 15:03:06 -0400, you wrote:

>It was an Ohmite Z-50 choke that exploded the first time. That's what Orr
>Radio Handbook 23rd edition uses on its 6m amp.

REPLY:
I remember the Ohmite Z-series chokes. That are effective chokes precisely
because they are self-resonant around the frequency of their nomenclature,
i.e, Z-50 = 50 MHz.

They are ok for filtering RF but they are the LAST thing you want to use for
a plate choke in a pi network output circuit.

I can't believe Mr Orr would use one for a plate choke except maybe in a
very QRP rig. Smoke time.
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