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curious symptom old Fisher stereo amp, inputs strange

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Guest

Fri May 22, 2015 4:00 am   



Been through that. The indicator lights are not lighting but the buttons are "locking" in. That means no TC9164. Or 3, or whatever.

Tim R
Guest

Fri May 22, 2015 1:46 pm   



On Friday, May 22, 2015 at 7:00:33 AM UTC-4, Leif Neland wrote:
Quote:
Tape output is connected to the connection between the input selector
and the volume/tone controls.

If there is no buffering on the output, it will also function as an
input, feeding signal to the volume/tone controls.

Leif


So is there any harm in just running it that way and using it?

Leif Neland
Guest

Fri May 22, 2015 5:01 pm   



Evan Platt forklarede:
Quote:
On Mon, 18 May 2015 06:05:13 -0700 (PDT), Tim R <timothy42b_at_aol.com
wrote:

I have an old Fisher amplifier, looks like this model

https://www.google.com/search?q=fisher+amplifier&biw=1366&bih=588&tbm=isch&imgil=QIHAkgR3TJHJ9M%253A%253Bx3bT_GyZ4ziaKM%253Bhttp%25253A%25252F%25252Fwww.icollector.com%25252FFisher-Integrated-Stereo-Amplifier_i13728010&source=iu&pf=m&fir=QIHAkgR3TJHJ9M%253A%252Cx3bT_GyZ4ziaKM%252C_&usg=__rKhDSvzeFYPjP0ZG43GdOgOEcds%3D&ved=0CCcQyjc&ei=jd5ZVeuIL4ajgwSB7IHIDg#imgrc=QIHAkgR3TJHJ9M%253A%3Bx3bT_GyZ4ziaKM%3Bhttp%253A%252F%252Fmedia.liveauctiongroup.net%252Fi%252F13488%252F13728010_1.jpg%253Fv%253D8CF479980774DC0%3Bhttp%253A%252F%252Fwww.icollector.com%252FFisher-Integrated-Stereo-Amplifier_i13728010%3B640%3B480

that I used for amplifying the laptop until it started acting funny and I
replaced it with an Onkyo. It's been so long I'd forgotten what was wrong.

It's reasonably powerful, small and portable, and so I dug it out of the
junk pile and used it this weekend for a harpsichord at church.

It has the usual choice of inputs (phono, cd/aux, tape in) but the only
input that would work was Tape Out. It did not matter if monitor was on or
off, or any mode selected.

Is that a common mode of failure? Seemed strange to me. This thing is not
worth fixing, I'm sure I got it for $3 at a yard sale, but I'm curious.

Tape out is an output, not an input. I have an older unit. It's for
putting the output to a tape recorder.


Tape output is connected to the connection between the input selector
and the volume/tone controls.

If there is no buffering on the output, it will also function as an
input, feeding signal to the volume/tone controls.

Leif

--
https://www.paradiss.dk
Ting til konen eller kæresten.
Eller begge.


Guest

Sat May 23, 2015 2:35 am   



Paying for the manual would be alright if I was working on it here. But for someone on the web at random, no. Can't do that.

Thanks anyway. Maybe the OP wants it though.

Interesting that is an OEM manual they say. Usually they generated their own. Are they like a licensed reseller or something now ? they used to reverse engineer almost everything, but I know that has gotten more difficult by orders of magnitude.

Michael A. Terrell
Guest

Sat May 23, 2015 6:08 am   



jurb6006_at_gmail.com wrote:
Quote:

I can't seem to get a print for that unit but from what you wrote I owuld bet you have a 12 volt regulator out.

If it has mechanical switches, you say the "lock" in, then it does not use that unobtainium IC. It might use some 4066 type CMOS switches but those are easy to get. But the fact there are lights not lighting means likely a supply is missing.


https://www.samswebsite.com/en/photofact/details/index/id/50794

Michael A. Terrell
Guest

Sat May 23, 2015 7:30 am   



jurb6006_at_gmail.com wrote:
Quote:

Paying for the manual would be alright if I was working on it here. But for someone on the web at random, no. Can't do that.

Thanks anyway. Maybe the OP wants it though.

Interesting that is an OEM manual they say. Usually they generated their own. Are they like a licensed reseller or something now ? they used to reverse engineer almost everything, but I know that has gotten more difficult by orders of magnitude.


They ended up with the huge collection of OEM manuals the NRI had,
when that school was shut down by McGraw-Hill. I once asked about
information on a 1938 Philco tombstone radio from NRI, and they mailed
me an original service manual for free, since I had taken a course at
one time.

Sams only reverse engineered items that sold in excess of 20 thousand
units, but they collected OEM data on everything they could get their
hands on. They also wrote manuals for some company's products that
didn't meet the 20K unit minimum. Those were only available from the
OEMs.

Phil Allison
Guest

Sat May 23, 2015 7:30 am   



Tim R wrote:

Quote:

If there is no buffering on the output, it will also function as an
input, feeding signal to the volume/tone controls.

Leif

So is there any harm in just running it that way and using it?


** Nope.




..... Phil

Tim R
Guest

Tue Jan 08, 2019 5:45 am   



Okay, this is a 3 year old post, but it's MY 3 year old post.

Just out of curiosity, I tried something. I was cleaning up in the basement, and about to throw this thing out.

But first, I opened it up. Obviously I'd not done that before, because I had trouble doing it.

Anyway, I sprayed contact cleaner into every switch and worked them a bit.

Much to my surprise, it seems to be working on inputs now instead of outputs. It's the perfect size for my main internet laptop, so maybe it's a keeper. For now.


Guest

Tue Jan 08, 2019 11:45 pm   



John-Del:

On a lot of receivers/amps(esp. older ones),
'Tape Out' does mean 'coming from' the
tape/cassette deck, and 'Tape In' means
what is going out of the receiver/amp to
the record deck.

From my own experience.


Guest

Tue Jan 08, 2019 11:45 pm   



On Tuesday, January 8, 2019 at 5:34:00 PM UTC-5, thekma...@gmail.com wrote:
Quote:
John-Del:

On a lot of receivers/amps(esp. older ones),
'Tape Out' does mean 'coming from' the
tape/cassette deck, and 'Tape In' means
what is going out of the receiver/amp to
the record deck.

From my own experience.


You have those backwards. On the receiver, the tape in "comes from" the tape.

The tape out comes from the pre-amp section prior to the volume control.


Guest

Wed Jan 09, 2019 12:45 am   



5:36 PMdansabr...@yahoo.com wrote:
"You have those backwards. On A RECENT receiver, the tape in
"comes from" the tape.
The tape out comes from the pre-amp section prior to the
volume control. "

See my edit(caps) above.

On older gear, pre-1980, the routing of
those ins and outs as I described them
stands. How do I know? Because I
assumed the same thing you stated
above, and got no audio! Once I
flipped both RCA pairs around, Voila,
everything was fine.


Guest

Wed Jan 09, 2019 1:45 am   



On Tuesday, January 8, 2019 at 6:07:32 PM UTC-5, thekma...@gmail.com wrote:
Quote:
5:36 PMdansabr...@yahoo.com wrote:
"You have those backwards. On A RECENT receiver, the tape in
"comes from" the tape.
The tape out comes from the pre-amp section prior to the
volume control. "

See my edit(caps) above.

On older gear, pre-1980, the routing of
those ins and outs as I described them
stands. How do I know? Because I
assumed the same thing you stated
above, and got no audio! Once I
flipped both RCA pairs around, Voila,
everything was fine.


I won't argue your results, but with 35 years of repairing audio gear, I have not seen one yet that has that property. The in/out label on any gear is usually for that particular unit. The same exists on tape machines. There are input and output jacks there as well. The "output" jack on the tape should be activated when the tape is in play mode, thus is an output.

Terry Schwartz
Guest

Wed Jan 09, 2019 2:45 am   



On Tuesday, January 8, 2019 at 4:34:00 PM UTC-6, thekma...@gmail.com wrote:
Quote:
John-Del:

On a lot of receivers/amps(esp. older ones),
'Tape Out' does mean 'coming from' the
tape/cassette deck, and 'Tape In' means
what is going out of the receiver/amp to
the record deck.

From my own experience.


Agreed --- my vintage Sansui receiver works exactly that way.

John-Del
Guest

Wed Jan 09, 2019 2:45 am   



On Tuesday, January 8, 2019 at 7:36:01 PM UTC-5, dansabr...@yahoo.com wrote:
Quote:
On Tuesday, January 8, 2019 at 6:07:32 PM UTC-5, thekma...@gmail.com wrote:
5:36 PMdansabr...@yahoo.com wrote:
"You have those backwards. On A RECENT receiver, the tape in
"comes from" the tape.
The tape out comes from the pre-amp section prior to the
volume control. "

See my edit(caps) above.

On older gear, pre-1980, the routing of
those ins and outs as I described them
stands. How do I know? Because I
assumed the same thing you stated
above, and got no audio! Once I
flipped both RCA pairs around, Voila,
everything was fine.

I won't argue your results, but with 35 years of repairing audio gear, I have not seen one yet that has that property. The in/out label on any gear is usually for that particular unit. The same exists on tape machines. There are input and output jacks there as well. The "output" jack on the tape should be activated when the tape is in play mode, thus is an output.


Same here.

I'm old enough and have seen enough to know I'll never see or know everything, but I've never seen a tape monitor setup where the tape out is an input.. I've got 45 years as a professional audio/video tech and have worked on many stereos, and this includes many vintage vacuum tube Scotts, Fishers, Eicos etc. from the 60s through the current HT surround receivers. But I'll never say never.

John-Del
Guest

Wed Jan 09, 2019 3:45 pm   



On Tuesday, January 8, 2019 at 8:11:28 PM UTC-5, Terry Schwartz wrote:
Quote:
On Tuesday, January 8, 2019 at 4:34:00 PM UTC-6, thekma...@gmail.com wrote:
John-Del:

On a lot of receivers/amps(esp. older ones),
'Tape Out' does mean 'coming from' the
tape/cassette deck, and 'Tape In' means
what is going out of the receiver/amp to
the record deck.

From my own experience.

Agreed --- my vintage Sansui receiver works exactly that way.


I have a 70s Sansewer receiver in my dungeon, I'll see how that one is configured. But I'm wondering if the tape mon connections are simply labelled "in" and "out", or if they're preceded by "connect to"...

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