dxtard wrote:


I know it must be hard for you, as it is for 'tards all over the world.



.....you _must_ know very well....

Stephan Grossklass wrote:


Yes, of course. Any ordinary silicon bridge rectifier in DIP will do
just fine (and, given it's totally oversized for 9.8 V ~ and about 100
mA, should do its job for a loooooong time). At least this experience
has expanded my list of potentially critical (read: best replaced)
components in old radios to (a) paper caps and electrolytics and (b)
selenium rectifiers. Now all I need is a *decent* soldering iron and the
tube radio that should hopefully arrive within the next few days / weeks
/ eternities - though the Grundig Signal 700 could use some service as
well (some humming, switches with contact probs and such - it's 30 years
old after all and has probably never undergone servicing).

Struggled with a 15 watt pencil iron for years. I hated the heavy
pistol grip 100/150 watt copper wire tipped guns. Way too awkward.
I finally broke down and bought a 35 watt pencil iron and it works very
well. I find the hotter tip spends a lot less time on the work, so in
the long run, it's most likely easier on the components than the smaller
iron was.

I've used the thermostatically controlled Weller cradle type and it was
very nice..but I couldn't justify the extra expense for the relatively
few joints I solder at a time.



mike

dxAce wrote:

And you're a 'tard, Billy. I'ts no wonder you make a great Democrat.

dxAce
Michigan
USA


You're just mad at him because he turned you in for severely beating
your dog. Have you served the jail time yet? If not, Bubba is waiting
for you..





mike

Volker Tonn wrote:


dxtard wrote:


I know it must be hard for you, as it is for 'tards all over the world.



....you _must_ know very well....


Yes, he does. He's been on the front lines of retardation for years.
They never did retrieve those pieces of shrapnel from his head.

He doesn't like talking about it, but when he was in the forces and
assigned to kitchen duty, an unfortunate episode with a clogged pressure
cooker maimed him severely.

His eyes still aim in different directions.





mike

m II wrote:

dxAce wrote:

And you're a 'tard, Billy. I'ts no wonder you make a great Democrat.

dxAce
Michigan
USA

You're just mad at him because he turned you in for severely beating
your dog. Have you served the jail time yet? If not, Bubba is waiting
for you..

Dog?

You're as delusional as Bryant!

dxAce
Michigan
USA

dxAce wrote:

You're just mad at him because he turned you in for severely beating
your dog. Have you served the jail time yet? If not, Bubba is waiting
for you..


Dog?

You're as delusional as Bryant!

dxAce
Michigan
USA

Still in denial I see. You can't get better until you accept
responsibility for your actions. Your parole officer told you that. Your
psychiatrist told you that.

As for Mr. Bryant, I'd rather be an instructor than a dog beater anyday.
Wouldn't the poor pooch fetch your paper? That's no reason to whip it
mercilessly with the leash. People who do that are beneath contempt.

Get with the program, you louse.




mike

Stephan Grossklass wrote:

The Germany-based Grundig IMHO was strongest in the early to mid, maybe
still late 80s. I have an FM tuner from this period, a T 7500 - it may
not have the high quality looks of others and lacks a few features
(switchable bandwidth, attenuator), but sonically beat the pants off a
Revox costing almost three times as much in those days ('83 or so). (And
it allowed entering 4-digit alpha tags for stations and had an 8-segment
signal strength display that was pretty much exactly logarithmic, both
not really features expected in a tuner with little more than a
middle-class price tag.) The thing is solidly built, the only point
where they cut costs a bit too much was the rectifier for the +5V
supply, which was a historic selenium type (!) notorious for failing.
Now guess what went south two hours after I got the thing...
Fortunately, this is good ol' macroscopic technology and not tiny SMD
stuff.
But, err, I digress.

Stephan

A selenium rectifier in a twenty year old solid state radio? I haven't
seen a selenium used in anything for more than thirty years, probably
close to forty.


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Stephan Grossklass wrote:

m II schrieb:

Stephan Grossklass wrote:

But, err, I digress.

Not at all..

Good post. It's nice to read a bit of that company's history. There must
be some silicon type replacements for the rectifier, no?

Yes, of course. Any ordinary silicon bridge rectifier in DIP will do
just fine (and, given it's totally oversized for 9.8 V ~ and about 100
mA, should do its job for a loooooong time). At least this experience
has expanded my list of potentially critical (read: best replaced)
components in old radios to (a) paper caps and electrolytics and (b)
selenium rectifiers. Now all I need is a *decent* soldering iron and the
tube radio that should hopefully arrive within the next few days / weeks
/ eternities - though the Grundig Signal 700 could use some service as
well (some humming, switches with contact probs and such - it's 30 years
old after all and has probably never undergone servicing).

Stephan

When replacing a selenium rectifier (bridge) with a silicon type you
should allow for the fact that the circuit was designed for the greater
forward resistance of the selenium. Otherwise the voltage output of the
silicon rectifier(s) won't be the same as it was with the selenium. This
may require adding a voltage dropping resistor.


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