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#1
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Seeburg AY160 selection problem
Help
Have a problem with the AY160 I'm restoring, I'm trying a new pulse amp (when I say new I of course mean another second hand one) and this is better than the old as it seems to sometimes select a record, about 1 in 15. Am I correct in assuming that this wouldn't be the tube on the pulse amp as I have changed the cap in the pulse amp, the tube glows fine and as I mention, it does sometimes select. I have not yet changed the caps in the Tormat unit, would this possibly cause an intermittent selection problem? The troubleshooting guide has all but led me to a faulty pulse amp (unlikely with 2) or a duff 12ax2 tube (I think that's what it is) Any ideas anyone Cheers shaun |
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#2
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My experience has been that you need to do more to repair a pulse amplifier
than simply replacing the coupling capacitor. There are about eight resistors inside the pulse amp that suffer ill effects (significant shifts in value) from all the heat trapped inside the pulse amp. A full rebuild of the pulse amp should involve replacing all the resistors in addition to the coupling capacitor. The selection receiver chassis also suffers similar problems. The 470K and 56K resistors connected to the pulse amp socket tend to get roasted and drift significantly in value. There is a 2.2M resistor connected to the 6X4 (?) tube socket, and a 36 ohm resistor inline with the readout circuit that are also prone to problems. Replace all the caps in the selection receiver and test all the resistors for proper value. Once you've done this the system is remarkably stable. Remember that selection problems can also be due to issues with the write-in circuitry inside the selection receiver and credit unit. A dirty write-in contact on the credit unit can contribute to erratic selection operation. A dirty read-out detent switch on the carriage can also contribute to erratic selection operation. Your best bet is to use the flashlight battery trick outlined in the manual to try to isolate the issue to a specific area - write-in, read-out, or sense. Or just cut your losses and fully rebuild the pulse amp and receiver. Joseph "Tony" Dziedzic In article , (Shaun) wrote: Help Have a problem with the AY160 I'm restoring, I'm trying a new pulse amp (when I say new I of course mean another second hand one) and this is better than the old as it seems to sometimes select a record, about 1 in 15. Am I correct in assuming that this wouldn't be the tube on the pulse amp as I have changed the cap in the pulse amp, the tube glows fine and as I mention, it does sometimes select. I have not yet changed the caps in the Tormat unit, would this possibly cause an intermittent selection problem? The troubleshooting guide has all but led me to a faulty pulse amp (unlikely with 2) or a duff 12ax2 tube (I think that's what it is) Any ideas anyone Cheers shaun |
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