I'm afraid I don't have enough tape machine knowledge to think of what would cause this. Anyone know?
If not, there should be a playback position for the switch for the input choices.
There is a small chance that there were jumpers to connect between the deck's tape output (or preamp- In addition to the "Record out", and the amplifier input.
:The volume stays up fine both record mode and radio inputs until I PRESS PLAY.... The volume only drops once I press the play button?? When the reels are still the inputs Radio or Microphone come thought loud and clear green eye is almost closed (meaning poweful signal) as soon as I hit the play/record button the signal slowly drops and the eye slowly opens then press stop and it comes back up? I believe this means the amplifier section is good through-out both preampp and power...
:
:I'm afraid I don't have enough tape machine knowledge to think of what would cause this. Anyone know?
:Hi,
:Does the deck have a "Monitor" position? If so, set it to the other position.
:
:If not, there should be a playback position for the switch for the input choices.
:
:There is a small chance that there were jumpers to connect between the deck's tape output (or preamp- In addition to the "Record out", and the amplifier input.
:
:
:
::The volume stays up fine both record mode and radio inputs until I PRESS PLAY.... The volume only drops once I press the play button?? When the reels are still the inputs Radio or Microphone come thought loud and clear green eye is almost closed (meaning poweful signal) as soon as I hit the play/record button the signal slowly drops and the eye slowly opens then press stop and it comes back up? I believe this means the amplifier section is good through-out both preampp and power...
::
::I'm afraid I don't have enough tape machine knowledge to think of what would cause this. Anyone know?
There is a small chance that the head is completely bad )open), but usually you can get something out of it for response. Check to make sure the leads are not shorted to each other, or the head shell, or any metal for that matter.
Is the tape blank? Does the deck make any sound if you place an energized soldering gun tip near the playback head? (this also works as an inexpensive demagnetizer too- Just never make contact with the face of the heads. You should hear a 60 cycle hum with a solder gun near the head.
If you tried to record the tape, and nothing recorded, there is an oscillator tube circuit, and that tube may be bad, or other usual suspect.
:Sorry it is a Telefunken Tube Reel to Reel and has no monitor just rcord 1 record 2 buttons with a 3Rd button either in Radio input or out Mic input. Then an on/off + pot for mic input level. Then a Play button + track 1 button and Track 2 button. And a volume pot..
:
:
:
::Hi,
::Does the deck have a "Monitor" position? If so, set it to the other position.
::
::If not, there should be a playback position for the switch for the input choices.
::
::There is a small chance that there were jumpers to connect between the deck's tape output (or preamp- In addition to the "Record out", and the amplifier input.
::
::
::
:::The volume stays up fine both record mode and radio inputs until I PRESS PLAY.... The volume only drops once I press the play button?? When the reels are still the inputs Radio or Microphone come thought loud and clear green eye is almost closed (meaning poweful signal) as soon as I hit the play/record button the signal slowly drops and the eye slowly opens then press stop and it comes back up? I believe this means the amplifier section is good through-out both preampp and power...
:::
:::I'm afraid I don't have enough tape machine knowledge to think of what would cause this. Anyone know?
It can't be any of the tubes or preamp or power section because in record mode with the tape stopped and a sound source coming in the Mic input it comes out loud and clear right out the speakerand doesn't fade at all, Solid as a rock , both channels.
As I say the volume comes back to normal when I FFd or Rwind.. If I just plug a mic in or music source and hit record but don't press the play to make the reels turn the sound is loud and doesn't fade and comes out the amp or speaker loud and clear either chanel OK. But when I press play in record or regular mode, it's like movement on the tape head is draining the audio signal slowly.. As soon as I hit stop the audio or mic input volume as well as audio out the speaker come right back up slowly. Hit play and drops down again slowly???
There is a sudden faint popp I hear once in a while.. All the electrolytic caps have been replaced.. Except the main power supply can that seems to be storing a charge just fine.. And measure OK.
:Hi,
:In that case, with volume up and either track one button, or track two button pushed in, and no modulation, there is probably a bad tube, cap, or the function switch internally is coming apart.
:
:There is a small chance that the head is completely bad )open), but usually you can get something out of it for response. Check to make sure the leads are not shorted to each other, or the head shell, or any metal for that matter.
:
:Is the tape blank? Does the deck make any sound if you place an energized soldering gun tip near the playback head? (this also works as an inexpensive demagnetizer too- Just never make contact with the face of the heads. You should hear a 60 cycle hum with a solder gun near the head.
:
:If you tried to record the tape, and nothing recorded, there is an oscillator tube circuit, and that tube may be bad, or other usual suspect.
:
:
::Sorry it is a Telefunken Tube Reel to Reel and has no monitor just rcord 1 record 2 buttons with a 3Rd button either in Radio input or out Mic input. Then an on/off + pot for mic input level. Then a Play button + track 1 button and Track 2 button. And a volume pot..
::
::
::
:::Hi,
:::Does the deck have a "Monitor" position? If so, set it to the other position.
:::
:::If not, there should be a playback position for the switch for the input choices.
:::
:::There is a small chance that there were jumpers to connect between the deck's tape output (or preamp- In addition to the "Record out", and the amplifier input.
:::
:::
:::
::::The volume stays up fine both record mode and radio inputs until I PRESS PLAY.... The volume only drops once I press the play button?? When the reels are still the inputs Radio or Microphone come thought loud and clear green eye is almost closed (meaning poweful signal) as soon as I hit the play/record button the signal slowly drops and the eye slowly opens then press stop and it comes back up? I believe this means the amplifier section is good through-out both preampp and power...
::::
::::I'm afraid I don't have enough tape machine knowledge to think of what would cause this. Anyone know?
I would supect there is a faulty cap, a bad wire, or a faulty switch connection/switch in the power switching segment- even a cold solder joint. I am guessing the playback preamp is on the order of an ECC80, ECC81, ECC82, ECC83, or ECC84(may be pinned different than the 9A basing), which are high gain dual triodes, and if possible- try operating the deck with a voltmeter first on the plates (1 and 6), then on the grids (2 and 7), and then see if there is potential on the cathode with respect to the chassis (3 and 8, and see what that does when voltage fades) of each tube section, and see which falls in potential as the audio fades, then it is a matter of tracing that path back to the switch, or solder track, and then back to the supply itself. And this assuming that there is no gassy tube.
The issue is pretty much localized to the playback preamp. I would not rule out the chance that an electrolytic is bad from the start, that popping you hear is sometimes an internal arc in a cap, or a tube even- especially if the caps are recycled from another piece of equipment. Because what may be happening is that either a cap is building up a charge before failing, or if a broken wire (would be near the switch terminal it attaches too if not otherwise damaged)the cap is keeping the preamp circuit energized for that 30 seconds after losing it's B voltage, or even A voltage.
:The Deck plays OK,, sound comes out fine, the problem is that the volume of the audio slowly fades about 30 seconds after pressing play.. After it fades down if I rewind or FFd the and then hit play before the reels have had a chance to stop then the audio comes out blasting loud again but then play back for around 15 or 30 secs and slowly (about 60 secs)fades down quiet. It is almost like I am energizing the tape head by FFwd or Rwing the deck but then as soon as I hit play the sound is being drained?
:
: It can't be any of the tubes or preamp or power section because in record mode with the tape stopped and a sound source coming in the Mic input it comes out loud and clear right out the speakerand doesn't fade at all, Solid as a rock , both channels.
:
: As I say the volume comes back to normal when I FFd or Rwind.. If I just plug a mic in or music source and hit record but don't press the play to make the reels turn the sound is loud and doesn't fade and comes out the amp or speaker loud and clear either chanel OK. But when I press play in record or regular mode, it's like movement on the tape head is draining the audio signal slowly.. As soon as I hit stop the audio or mic input volume as well as audio out the speaker come right back up slowly. Hit play and drops down again slowly???
:
:There is a sudden faint popp I hear once in a while.. All the electrolytic caps have been replaced.. Except the main power supply can that seems to be storing a charge just fine.. And measure OK.
:
:
:
::Hi,
::In that case, with volume up and either track one button, or track two button pushed in, and no modulation, there is probably a bad tube, cap, or the function switch internally is coming apart.
::
::There is a small chance that the head is completely bad )open), but usually you can get something out of it for response. Check to make sure the leads are not shorted to each other, or the head shell, or any metal for that matter.
::
::Is the tape blank? Does the deck make any sound if you place an energized soldering gun tip near the playback head? (this also works as an inexpensive demagnetizer too- Just never make contact with the face of the heads. You should hear a 60 cycle hum with a solder gun near the head.
::
::If you tried to record the tape, and nothing recorded, there is an oscillator tube circuit, and that tube may be bad, or other usual suspect.
::
::
:::Sorry it is a Telefunken Tube Reel to Reel and has no monitor just rcord 1 record 2 buttons with a 3Rd button either in Radio input or out Mic input. Then an on/off + pot for mic input level. Then a Play button + track 1 button and Track 2 button. And a volume pot..
:::
:::
:::
::::Hi,
::::Does the deck have a "Monitor" position? If so, set it to the other position.
::::
::::If not, there should be a playback position for the switch for the input choices.
::::
::::There is a small chance that there were jumpers to connect between the deck's tape output (or preamp- In addition to the "Record out", and the amplifier input.
::::
::::
::::
:::::The volume stays up fine both record mode and radio inputs until I PRESS PLAY.... The volume only drops once I press the play button?? When the reels are still the inputs Radio or Microphone come thought loud and clear green eye is almost closed (meaning poweful signal) as soon as I hit the play/record button the signal slowly drops and the eye slowly opens then press stop and it comes back up? I believe this means the amplifier section is good through-out both preampp and power...
:::::
:::::I'm afraid I don't have enough tape machine knowledge to think of what would cause this. Anyone know?
:
:
:
:Hi,
:
:I would supect there is a faulty cap, a bad wire, or a faulty switch connection/switch in the power switching segment- even a cold solder joint. I am guessing the playback preamp is on the order of an ECC80, ECC81, ECC82, ECC83, or ECC84(may be pinned different than the 9A basing), which are high gain dual triodes, and if possible- try operating the deck with a voltmeter first on the plates (1 and 6), then on the grids (2 and 7), and then see if there is potential on the cathode with respect to the chassis (3 and 8, and see what that does when voltage fades) of each tube section, and see which falls in potential as the audio fades, then it is a matter of tracing that path back to the switch, or solder track, and then back to the supply itself. And this assuming that there is no gassy tube.
:
:The issue is pretty much localized to the playback preamp. I would not rule out the chance that an electrolytic is bad from the start, that popping you hear is sometimes an internal arc in a cap, or a tube even- especially if the caps are recycled from another piece of equipment. Because what may be happening is that either a cap is building up a charge before failing, or if a broken wire (would be near the switch terminal it attaches too if not otherwise damaged)the cap is keeping the preamp circuit energized for that 30 seconds after losing it's B voltage, or even A voltage.
:
::The Deck plays OK,, sound comes out fine, the problem is that the volume of the audio slowly fades about 30 seconds after pressing play.. After it fades down if I rewind or FFd the and then hit play before the reels have had a chance to stop then the audio comes out blasting loud again but then play back for around 15 or 30 secs and slowly (about 60 secs)fades down quiet. It is almost like I am energizing the tape head by FFwd or Rwing the deck but then as soon as I hit play the sound is being drained?
::
:: It can't be any of the tubes or preamp or power section because in record mode with the tape stopped and a sound source coming in the Mic input it comes out loud and clear right out the speakerand doesn't fade at all, Solid as a rock , both channels.
::
:: As I say the volume comes back to normal when I FFd or Rwind.. If I just plug a mic in or music source and hit record but don't press the play to make the reels turn the sound is loud and doesn't fade and comes out the amp or speaker loud and clear either chanel OK. But when I press play in record or regular mode, it's like movement on the tape head is draining the audio signal slowly.. As soon as I hit stop the audio or mic input volume as well as audio out the speaker come right back up slowly. Hit play and drops down again slowly???
::
::There is a sudden faint popp I hear once in a while.. All the electrolytic caps have been replaced.. Except the main power supply can that seems to be storing a charge just fine.. And measure OK.
::
::
::
:::Hi,
:::In that case, with volume up and either track one button, or track two button pushed in, and no modulation, there is probably a bad tube, cap, or the function switch internally is coming apart.
:::
:::There is a small chance that the head is completely bad )open), but usually you can get something out of it for response. Check to make sure the leads are not shorted to each other, or the head shell, or any metal for that matter.
:::
:::Is the tape blank? Does the deck make any sound if you place an energized soldering gun tip near the playback head? (this also works as an inexpensive demagnetizer too- Just never make contact with the face of the heads. You should hear a 60 cycle hum with a solder gun near the head.
:::
:::If you tried to record the tape, and nothing recorded, there is an oscillator tube circuit, and that tube may be bad, or other usual suspect.
:::
:::
::::Sorry it is a Telefunken Tube Reel to Reel and has no monitor just rcord 1 record 2 buttons with a 3Rd button either in Radio input or out Mic input. Then an on/off + pot for mic input level. Then a Play button + track 1 button and Track 2 button. And a volume pot..
::::
::::
::::
:::::Hi,
:::::Does the deck have a "Monitor" position? If so, set it to the other position.
:::::
:::::If not, there should be a playback position for the switch for the input choices.
:::::
:::::There is a small chance that there were jumpers to connect between the deck's tape output (or preamp- In addition to the "Record out", and the amplifier input.
:::::
:::::
:::::
::::::The volume stays up fine both record mode and radio inputs until I PRESS PLAY.... The volume only drops once I press the play button?? When the reels are still the inputs Radio or Microphone come thought loud and clear green eye is almost closed (meaning poweful signal) as soon as I hit the play/record button the signal slowly drops and the eye slowly opens then press stop and it comes back up? I believe this means the amplifier section is good through-out both preampp and power...
::::::
::::::I'm afraid I don't have enough tape machine knowledge to think of what would cause this. Anyone know?
::
::
::
Now you know it is always good to go through things twice- even your own work.
The solenoid winding circuit completed momentarily when the sensing tape bridges the gap on the sensor. The energized coil winding pulls the "armature" (the magnetic rod) in, and then releases by the time the conductive tape has passed.
:Found it,,, it was the solenoid I replaced the insulation between the cylinders forgot one isolation washer meaning the hot was shorting on the pole that goes through the hole of the part, Don't know why it played at all then as one would think it should have stopped as when the hot gets shorted to ground with a piece of metal tape it is supposed to trip the stop mechanism??
:Any way as soon as I took the hot off the audio stopped being drained. Thanx B
:
:
::Hi,
::
::I would supect there is a faulty cap, a bad wire, or a faulty switch connection/switch in the power switching segment- even a cold solder joint. I am guessing the playback preamp is on the order of an ECC80, ECC81, ECC82, ECC83, or ECC84(may be pinned different than the 9A basing), which are high gain dual triodes, and if possible- try operating the deck with a voltmeter first on the plates (1 and 6), then on the grids (2 and 7), and then see if there is potential on the cathode with respect to the chassis (3 and 8, and see what that does when voltage fades) of each tube section, and see which falls in potential as the audio fades, then it is a matter of tracing that path back to the switch, or solder track, and then back to the supply itself. And this assuming that there is no gassy tube.
::
::The issue is pretty much localized to the playback preamp. I would not rule out the chance that an electrolytic is bad from the start, that popping you hear is sometimes an internal arc in a cap, or a tube even- especially if the caps are recycled from another piece of equipment. Because what may be happening is that either a cap is building up a charge before failing, or if a broken wire (would be near the switch terminal it attaches too if not otherwise damaged)the cap is keeping the preamp circuit energized for that 30 seconds after losing it's B voltage, or even A voltage.
::
:::The Deck plays OK,, sound comes out fine, the problem is that the volume of the audio slowly fades about 30 seconds after pressing play.. After it fades down if I rewind or FFd the and then hit play before the reels have had a chance to stop then the audio comes out blasting loud again but then play back for around 15 or 30 secs and slowly (about 60 secs)fades down quiet. It is almost like I am energizing the tape head by FFwd or Rwing the deck but then as soon as I hit play the sound is being drained?
:::
::: It can't be any of the tubes or preamp or power section because in record mode with the tape stopped and a sound source coming in the Mic input it comes out loud and clear right out the speakerand doesn't fade at all, Solid as a rock , both channels.
:::
::: As I say the volume comes back to normal when I FFd or Rwind.. If I just plug a mic in or music source and hit record but don't press the play to make the reels turn the sound is loud and doesn't fade and comes out the amp or speaker loud and clear either chanel OK. But when I press play in record or regular mode, it's like movement on the tape head is draining the audio signal slowly.. As soon as I hit stop the audio or mic input volume as well as audio out the speaker come right back up slowly. Hit play and drops down again slowly???
:::
:::There is a sudden faint popp I hear once in a while.. All the electrolytic caps have been replaced.. Except the main power supply can that seems to be storing a charge just fine.. And measure OK.
:::
:::
:::
::::Hi,
::::In that case, with volume up and either track one button, or track two button pushed in, and no modulation, there is probably a bad tube, cap, or the function switch internally is coming apart.
::::
::::There is a small chance that the head is completely bad )open), but usually you can get something out of it for response. Check to make sure the leads are not shorted to each other, or the head shell, or any metal for that matter.
::::
::::Is the tape blank? Does the deck make any sound if you place an energized soldering gun tip near the playback head? (this also works as an inexpensive demagnetizer too- Just never make contact with the face of the heads. You should hear a 60 cycle hum with a solder gun near the head.
::::
::::If you tried to record the tape, and nothing recorded, there is an oscillator tube circuit, and that tube may be bad, or other usual suspect.
::::
::::
:::::Sorry it is a Telefunken Tube Reel to Reel and has no monitor just rcord 1 record 2 buttons with a 3Rd button either in Radio input or out Mic input. Then an on/off + pot for mic input level. Then a Play button + track 1 button and Track 2 button. And a volume pot..
:::::
:::::
:::::
::::::Hi,
::::::Does the deck have a "Monitor" position? If so, set it to the other position.
::::::
::::::If not, there should be a playback position for the switch for the input choices.
::::::
::::::There is a small chance that there were jumpers to connect between the deck's tape output (or preamp- In addition to the "Record out", and the amplifier input.
::::::
::::::
::::::
:::::::The volume stays up fine both record mode and radio inputs until I PRESS PLAY.... The volume only drops once I press the play button?? When the reels are still the inputs Radio or Microphone come thought loud and clear green eye is almost closed (meaning poweful signal) as soon as I hit the play/record button the signal slowly drops and the eye slowly opens then press stop and it comes back up? I believe this means the amplifier section is good through-out both preampp and power...
:::::::
:::::::I'm afraid I don't have enough tape machine knowledge to think of what would cause this. Anyone know?
:::
:::
:::