[Hallicrafters] SX-28a questions

[Jon Miccolis]

In response to my own question regarding replacement and/or repair:

Hammond 270HX<http://www.mouser.com/ProductDetail/Hammond-Manufacturing/270HX/?qs=sGAEpiMZZMumryolnogYRhElZItiX0KT>for
under $100.00 looks like a viable replacement if necessary and it does
indeed look like Gary at least still has a website up for
rewinding<http://members.tripod.com/tubes_tubes_tubes/transformerrewindingservice/index.html>
.

-Jon

On Mon, Oct 22, 2012 at 10:16 AM, Jon Miccolis <jon.miccolis at gmail.com>wrote:

> Thanks Nick, Joe, and Tom for the replies and the constructive guidance
> and advice!
>
> I think that a combination of advice given is in order.
>
> The power transformer didn't show any signs of meltdown nor did it give
> off any odd smells.  Hopefully it's ok.  If not what is the alternative?
>  Rewind?  Is Gary?? still rewinding these?  Anybody aware of any equivalent
> replacements Dahl or Hammond or? Quickly perused the Antique Electronic
> Supply site and didn't see anything directly compatible.  Let's just hope
> that mine is a-ok!
>
> Yes, 110 vac. for sure.  I meant that instead of 117 vac in my original
> email!  For sure a bucking x-former is in the future and have looked at
> several schematics online.
>
> Correct.  Archer was associated w/Radio Shack.  I need to get more info on
> this x-former although I will likely replace anyway.  It appears to be
> sturdy and well made but it's what's inside that counts!  Thanks for the
> tip on the Hammond universal.  I'll check 'em out.
>
> Line cord has been removed and power (at any level) will not be again
> applied until at least the following has been completed:
>
>    1. New three prong line cord
>    2. New fuse
>    3. Replace C41, 42, 44, 45, 46, 47, 48, 49, 51, 52 (all filter caps
>    and audio caps)
>
> Next, I'll follow Tom's advice and unplug all tubes, insert AC into the
> x-former at a lower voltage and measure outputs.  If a-ok then increase and
> measure again.  If all ok and x-former determined to be ok then begin the
> remainder of the recap and re-resistor task wherever and whenever
> applicable.  If x-former not good then research and measure possible
> options for repair/replacement.
>
> Nick - I like your advice (remove rectifier and power-up) but will get the
> same data with even less risk using Tom's method, right?
>
> Thanks again everybody for the advice - - and the links!
>
> I understand that patience is more than a virtue in this hobby and that
> work must be undertaken in stages.  Fortunately I am not in any hurry to
> get this restoration completed.
>
> I will get the caps that I need and check back in once I have recapped the
> filter and audio caps and have determined the condition of T7.
>
> Best 73!
> Jon, kb9wvk
>



-- 
“The surest way to corrupt a youth is to instruct him to hold in higher
esteem those who think alike than those who think differently.”
- F. Nietzsche

Siþen o Salamon þe wis, How craftilik he did iustis . . . (from *Cursor
Mundi*,* *An anonymous Northumbrian Poem of the 14th Century)