[Boatanchors] EF Johnson thunderbolt

[Walt Cates]

A lot of systems do plate current monitoring on the low side of the high voltage rectifier. The Hallicrafters P2000 is a good example of that.

See: P-2000 restore (wordpress.com)<https://wd0gof.files.wordpress.com/2021/06/p2000-restore-v3.51.pdf>


 Walt Cates, WD0GOF
https://wd0gof.com/Hallicrafters

A majority of acceptance is not proof of correctness.
https://wd0gof.com/bible-study/commentaries/


________________________________
From: boatanchors-bounces at mailman.qth.net <boatanchors-bounces at mailman.qth.net> on behalf of Rob Atkinson <ranchorobbo at gmail.com>
Sent: Tuesday, August 24, 2021 3:09 PM
To: KA2PTE <ka2pte at 3950.net>
Cc: Boat Anchors List <boatanchors at mailman.qth.net>
Subject: Re: [Boatanchors] EF Johnson thunderbolt

That sounds like a mistake.  What's wrong with measuring cathode
current?  It's a lot safer.  You can measure the plate current using
the cathode.

Rob
K5UJ

On Mon, Aug 23, 2021 at 8:21 PM KA2PTE <ka2pte at 3950.net> wrote:
>
> Curious if anyone here would know the max KV rating for the stock plate
> meter?
> It looks pretty sturdy, and I am rewiring it so its actually measuring plate
> current, not cathode current as it was modded previously.It will have 3.5Kv
> on it now,
> which is more than the factory 2.4Kv
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