[Hammarlund] HQ-150 Line Bypass Caps Needed

[David Wise]

Today, there are caps specially-designed to go across the mains.
"Class X" (X1, etc) goes between hot and neutral, Class Y goes
between hot or neutral and ground.  Emphasis is placed on having
them fail open, not shorted (i.e. on fire :).  As to value, all
of the ones you listed are fine, the only important thing is low
impedance at RF.  The fact that different values were selected can
be chalked up to individual designer's habits and predilections.

Dave Wise

>-----Original Message-----
>From: hammarlund-bounces at mailman.qth.net 
>[mailto:hammarlund-bounces at mailman.qth.net] On Behalf Of Bill Stewart
>Sent: Monday, August 23, 2010 9:37 AM
>To: hammarlund
>Subject: Re: [Hammarlund] HQ-150 Line Bypass Caps Needed
>
>
>
>At the risk of running this subj. in the ground, let me ask 
>one more question. 
>What governs the capacitance/voltage spec of the line bypass 
>capacitor? I have several Hammarlund  rcvrs and the values 
>vary from .01uf used on the HQ-100, 110, 150, 170; .05uf used 
>on the HQ-120X & 129X and .022 on the HQ-140X. And the voltage 
>ratings run from 500V (HQ-120X & HQ-129X) to 1.4kv on the 
>others. Some of these rcvrs are similar, but they use diff. 
>values. I assume the capacitor voltage ratings used were for 
>DC, but substantial enough to handle 3 or 4 hundred vac (have 
>never noticed any ac ratings for these capacitors). 
>
>Tnx, Bill, K4JYS 
>