help on fisher tube receiver

Archived from groups: rec.audio.pro (More info?)

In article <_wJ2e.324$JE7.195@fe06.lga>, Hydebee <hydebee@chartertn.net> wrote:
>recently i acquired a fisher 400 tube receiver in great condition , all
>tubes light etc but no sound at all anyone give me advice on what to check
>email me at hydebee@chartertn.net

Well, I'd start checking out the B+ and making sure the rectifier tube is
good, then working my way through the output stage. These things are basically
very easy to work on and your local TV repair shop should be able to deal
with it. They have a couple odd things here and there (like filaments being
used as cathode resistors) but for the most part they are straightforward
and docs are easy to get.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Archived from groups: rec.audio.pro (More info?)

On Thu, 31 Mar 2005 05:14:45 GMT, SSJVCmag <ten@nozirev.gamnocssj.com>
wrote:

>> ... They have a couple odd things here and there (like filaments being
>> used as cathode resistors)
>
>???!
>THAT¹S interesting...

It's in the Big Red Bible, a GE amp thingy, but I don't remember it
in Fishers. I do remember a DC filament supply being used for bias,
but please, don't make me look it up.

Anyway, my off-the-cuff guess is that the OP doesn't have his
speakers connected. It's *not* obvious or trivial on these old
guys. Sometimes output transformer commons float from ground,
or other gotcha's. Sometimes one speaker output will run through
a polarity reversing switch. Stuff like that. Do you get headphone
output?

Good fortune,

Chris Hornbeck
6x9=42
"Right, the DBT is for all intents and purposes vastly superior to
casual listening."

Archived from groups: rec.audio.pro (More info?)

In article <_wJ2e.324$JE7.195@fe06.lga> hydebee@chartertn.net writes:

> recently i acquired a fisher 400 tube receiver in great condition , all
> tubes light etc but no sound at all

That's an interesting description of "great condition." Does that
version of our language come from too much shopping on eBay?



--
I'm really Mike Rivers (mrivers@d-and-d.com)
However, until the spam goes away or Hell freezes over,
lots of IP addresses are blocked from this system. If
you e-mail me and it bounces, use your secret decoder ring
and reach me here: double-m-eleven-double-zero at yahoo

Archived from groups: rec.audio.pro (More info?)

Scott Dorsey wrote:
> SSJVCmag <ten@nozirev.gamnocssj.com> wrote:
> >On 3/30/05 10:07 PM, in article d2fpgp$lgu$1@panix2.panix.com,
"Scott
> >Dorsey" <kludge@panix.com> wrote:
> >
> >> ... They have a couple odd things here and there (like filaments
being
> >> used as cathode resistors)
> >
> >???!
> >THAT¹S interesting...
>
> I'm not sure why Fisher did it. The same trick is also used on some
> phantom-powered mikes using submini tubes, and I know it was done
there
> for efficiency.
> --scott
> --
> "C'est un Nagra. C'est suisse, et tres, tres precis."


I think because they wanted to run the filaments on DC to reduce hum
and it was not easy in those days before transistors and silicon
diodes to build a low volatge realtivly high current DC power supply
that is well filtered. It took big caps and or inductors.

Mark