DX-60 Kit: Modern Equivalents

[Nick England]

I wholeheartedly agree with Ron - what Paul has is a box full of New Old Stock
components so there is no reason for wholesale replacement. Most component
degradation is caused by heat plus time, not time alone. Check the parts and
replace only the bad ones, but I'll bet there will be few replacements. I'll
bet 90% of hamfest DX-60s will operate perfectly OK as is after electrolytic
reforming - and those contain old used/abused parts, not New Old Stock ones.

Paul - If you really decide to do a wholesale replacement, please send all your
"rejects" to me - I can definitely use them!

I think keeping kits unbuilt is a worthwhile ideal (as a symbol of our
technological heritage, not for $). So I'd also recommend Paul take apart an
existing DX-60 and rebuild it with new parts, rather than assembling a one of a
kind unbuilt kit.
--------------------------
Nick KD4CPL
p.s. - will trade my unbuilt DX-100 for an unbuilt Mohawk - trade only, not for
sale.

----- Original Message ----- 
From: "Ron" <ra.ah at RCN.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Saturday, September 10, 2005 11:12 PM
Subject: Re: [HEATH-TEMPE] DX-60 Kit: Modern Equivalents


> paul hendershott wrote:
> > Hi Folks! I will be building (yes, and no doubt lowering the
> > value of) a Heath DX-60 xmtr kit. I want to order all new
>  > resistors and capacitors and replace them with their modern
>  > equivalents.
>
> Why? I would only replace bad caps and then,
> for the same type, except for tubular paper
> caps that can be replaced with any film caps
> (polypropylene are the best for stability).
> Feed through caps MUST NOT be replaced with
> anything else. Silver mica are excellent
> (probably the best) when the lowest impedance
> at high frequencies is called for. Low cost
> ceramics may be substituted with NPO or other
> higher stability ceramic types.
>
> I would check electrolytics before construction.
> If leaky, I would try to form. If unsuccessful,
> then I would replace.
>

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