[Hallicrafters] Very slow warm-up for SX-62

[Bill Husted]

I've taken Carl's advice to heart and unplugged the radio. Before I did that 
I noticed that the warm-up time had decreased - that part is actually near 
normal now.

I am basically a first-timer when it comes to tube type radios (I did recap, 
without creating any sort of disaster that let the smoke out of the radio, 
an SX-100). But I do not want to cause any harm and since Carl says the 
SX-62 is difficult and not a job that a first-timer should tackle I'm at 
sort of a pause now. I'd like to do the work myself and think - if I take my 
time - I can. But, for the moment, the radio is just sitting on a shelf 
amongst a few other old Hallicrafters.

I truly appreciate those who have written with advice on this thing. It's 
fun to learn and I'm taking all the advice to heart.

Bill KQ4YA


----- Original Message ----- 
From: "Todd, KA1KAQ" <ka1kaq at gmail.com>
To: "Carl" <km1h at jeremy.mv.com>
Cc: "Bill Husted" <bhusted at bellsouth.net>; <Hallicrafters at mailman.qth.net>
Sent: Tuesday, July 13, 2010 11:52 AM
Subject: Re: [Hallicrafters] Very slow warm-up for SX-62


> On Sat, Jul 10, 2010 at 12:42 PM, Carl <km1h at jeremy.mv.com> wrote:
>> Unplug the radio and do a full recap as well as checking for out of
>> tolerance resistors. Otherwise you risk burning up the power and audio
>> transformers.
>>
>> This is the hardest, along with the similar SX-42, Hallicrafters to work 
>> on.
>> Its not for a first timer.
>
>
> SX-28 is a bear, too!
>
> After doing as Carl suggests (especially the audio output and power
> supply circuits), go to the tubes. Weak tubes can indeed cause low
> audio, but so can a mismatch in speaker impedance. They can also cause
> the slow warm up symptoms you describe as it takes them longer to
> build up some level of functionality due to their depleted condition.
>
> A tube tester is excellent for checking things like dead shorts, gas,
> and so on, but won't necessarily guarantee a 'good' tube. Couple years
> back I had some issues with a 75A-4 after changing a weak tube with a
> NOS JAN replacement. I checked it twice on the tester, it looked
> great. It was only after I placed another tube in its place that the
> radio worked properly again.
>
> ~ Todd,  KA1KAQ/4