[Hallicrafters] Replacement Capacitors

[Mark Bell]

Going from memory here..... cuz I can't find my HT-37 manual,  that 750V is
steady state.   Is that measured off of a choke ?   I'm wondering about
voltage transients -- that may be why the caps were originally rated at 600V
each.   In that case 900V may not be enough.

The equivalent circuit would be 10 uF at 1.2 KV.

900V Seems a bit low.   Maybe someone with the schematic in front of them
can comment.

73 Mark K3ZX
.

----- Original Message -----
From: "Bill" <k2wh at optonline.net>
To: "Hallicrafters" <hallicrafters at mailman.qth.net>
Sent: Sunday, October 12, 2003 10:23 AM
Subject: [Hallicrafters] Replacement Capacitors


> Thanks for all the replies about capacitor replacements
> in the HT-37.
>
> The 2 caps I will be replacing are C69 & C80 20uF at 600vdc.
> These are in series and are connected to the 750vdc line for
> a total working voltage of 1200.  Since I cannot find the
> original rating of 600vdc, I will be using (2) 450vdc caps in
> their place for a total of 900vdc rating and 13.5 uF giving me
> a buffer of 150v.
>
> All feedback indicates that the newer caps having better
> construction with higher dielectric materials, should be
> able to handle the 750vdc.
>
> Any dissenters in the ranks on this idea?
>
> K2WH
>
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