[Boatanchors] Carbon Comp V ratings

[Rodger Singley]

There will be no DC differential across the parasitic suppressor because of the coil and the only differential across the resistor should occur where the coil is supplying significant reactance which is well above the operating frequency (as is intended).  So the RF at that frequency will be forced primarily through the resistor which is how it provides stability.

Often a “cooked” parasitic resistor is primarily from an abused final where significant heat from the anode is conducted into the resistor.  I have seen more than one tube with solder melted from the plate cap connector running out due to the heat.  It impresses me how much a typical anode seal can take before failure.

Rodger WQ9E

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From: Jacques Fortin<mailto:jacques.f at videotron.ca>
Sent: Wednesday, February 14, 2018 9:00 PM
To: 'Brian'<mailto:brianclarke01 at optusnet.com.au>; boatanchors at mailman.qth.net<mailto:boatanchors at mailman.qth.net>; 'Bill Cromwell'<mailto:wrcromwell at gmail.com>
Subject: Re: [Boatanchors] Carbon Comp V ratings

WOW !
Why they do not vaporize instantly, then ?

73, Jacques, VE2JFE

-----Message d'origine-----
De : boatanchors-bounces at mailman.qth.net
[mailto:boatanchors-bounces at mailman.qth.net] De la part de Brian
Envoyé : 14 février 2018 21:40
À : boatanchors at mailman.qth.net; Bill Cromwell <wrcromwell at gmail.com>
Objet : Re: [Boatanchors] Carbon Comp V ratings

Hello Bill,

Your assertion is only true when there is no RF on the plate. When the tube
is driven to full saturation, there will be nearly + and - 1200 V
alternating across the parasitic resistor.

73 de Brian, VK2GCE.

-----Original Message-----
From: Bill Cromwell
Sent: Thursday, February 15, 2018 1:15 PM
To: boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] Carbon Comp V ratings

That parasitic surpessor is not across the B+ supply to ground. It is in
series in the plate circuit so 1200 volts B+ on one side and um...pretty
darn close to 1200 volts on the other end. Just keep the golden screwdriver
clear of it ;)

73,

Bill  KU8H


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