[Heathkit] Dumb speaker question

[rbethman]

Wayne,

Carl makes a good point!

Additionally, If a resistor is connected to a plate or filament, and 
carefully checking what else, You can always pull the tube to ensure 
isolation.

Bob - N0DGN

On 2/28/2010 3:05 PM, Carl Nord wrote:
> Wayne,
>
> In my experience a number of resistors in a radio are isolated. By that I
> mean do they go to a grid or a capacitor so by looking at the circuit you
> will find many can be done without touching them
>
> Older wax caps or Black Beauty types I just change out period. But something
> from the SB era is likely to be ceramic disc so should be OK
>
>
> Carl
> WA1KPD
> Visit My Boatanchor Collection at
> http://home.comcast.net/~chnord/wa1kpd.html
>
>
> -----Original Message-----
> From: heathkit-bounces at mailman.qth.net
> [mailto:heathkit-bounces at mailman.qth.net] On Behalf Of Wayne Harrah
> Sent: Sunday, February 28, 2010 2:53 PM
> To: Heathkit at mailman.qth.net
> Subject: Re: [Heathkit] Dumb speaker question
>
> <snip>
>
> An SB-310 or an SB-102 "SHOULD" receive as well as an FT-101 or a TS-520.
> An alignment would be beneficial, HOWEVER, you'll most likely also find
> resistors and some capacitors have gone significantly out of spec.
> It will be a dual effort.  I'd suggest first checking component values,
> especially the resistors, before performing an alignment.
>
> <endsnip>
>
> This will sound like its right out of a "Mr. Obvious" script, but need a
> clarification on philosophy in restoring Bas... I learned a long time ago
> from my Elmer that in checking resistances, you have to isolate the device
> being measured from the rest of the circuit... which means there is likely a
> lot of invasive lead-cutting and re-soldering to restore connections, is
> there not?  If so, it seems to me that just going ahead and replacing each
> component might be the smart thing to do.
>
> What is the general concensus on that endeavor?  Is that a wise move once
> one decides to go thru the radio, to just replace every resistor and cap?
> Seems like a daunting job, but at the same time your reply makes it sound
> worthwhile.
>
> Thanks.
> Wayne, ke0ms
>
>
>
>
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