[Boatanchors] HQ-150 Line Bypass Caps Needed

[Carl]

A couple of points Al.

1. Vishay WYO .0047 250VAC caps at Mouser are .38 each, while standard .0047 
@ 1000V are .50 each. The WYO are dual rated for X1 and Y2.

2. Many if not most vintage radio collectors  (as compared to ham gear only) 
prefer the 3 cap bypass method. One from each side of the AC line to ground 
and one between them. This way it doesnt matter which way you plug in a non 
polarized 2 wire cord or a 2 wire polarized cord into a miswired outlet. 
Since the safety caps are designed to fail open there is no longer a concern 
about a hot chassis.

My cord preference is new 2 wire polarized cords made to look like the old 
brown ones. Since I did all my own AC wiring and checked every outlet I know 
its done correct (-; but I still use the 3 cap method so future radio owners 
are still safe.

Carl
KM1H


----- Original Message ----- 
From: "Al Parker" <anchor at ec.rr.com>
To: "Bill Stewart" <cwopr at embarqmail.com>
Cc: "boatanchors" <boatanchors at mailman.qth.net>
Sent: Saturday, August 21, 2010 8:35 PM
Subject: Re: [Boatanchors] HQ-150 Line Bypass Caps Needed


> Hi Bill,
> Get X1/Y2 line "safety" bypass caps from Mouser, or elsewhere.
> I copy the following from Roy Morgan's "diatribe" re: installation of 
> them:
> --------------------
> "RF Bypass caps should be installed as follows:
>
> One from Line to Neutral, after the fuse.
> One from neutral to chassis.
>
> Do not install one from line to chassis and neutral to chassis as was
> normally done years ago.  This causes a danger of fire should the line
> to chassis cap short but not draw enough current to blow the circuit
> breaker, and this arrangement also causes the chassis to be at half the
> line voltage if the safety ground is not present (such as in a two-wire
> outlet used with an adapter, or in an outlet improperly wired or faulty.)
>
> There are currently available "Safety" capacitors meant for line bypass
> applications. You can tell them from normal caps in the catalogs because
> they cost about 5 times as much as normal caps.  If you take apart
> computer power supplies or junk TV sets, you will wind up with one or
> two from each unit."
> --------------------------
> 73,
> Al, W8UT
> www.boatanchors.org
> www.hammarlund.info
>
> "There is nothing -- absolutely nothing -- half so much
> worth doing as simply messing about in boats"
> Ratty, to Mole
>
> On 8/21/2010 6:57 PM, Bill Stewart wrote:
>>
>>
>>
>>
>>
>>
>> Good afternoon all,
>>
>> The 120 vac line bypass caps in my HQ-150 made the ultimate sacrifice and 
>> saved the rx from more damage due to a lightning surge on the power line. 
>> None in the junk box. Does anyone have a couple they could spare...good 
>> orig parts (.01mf, Cer. disc, C53&  C54...not sure of the voltage rating) 
>> or modern day replacements..probably the best choice.. would be fine. And 
>> of course, parts cost and postage would be forthcoming.
>>
>>
>>
>> Many thanks, Bill K4JYS
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