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#1
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Seeburg Pulse Amp
Hi all,
I've searched the group for info on the Pulse amp (in my AY160) causing selection problems. I've also followed the troubleshooting guide and have located ther issue as being the pulse amp (or so I think!) I've changed the cap in the unit and still no joy, someone has worked on this before as the 5m resistor is made up of 4 other restistoes but it comes to almost 5m. There is a small ferrite coil in there, looks like a transformer / choke and its busted up but it would appear that the windings are still ok. Anyone got any idea what that does and will it work if the case is broken? Any thoughts welcome Cheers Shaun |
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#2
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While the coupling capacitor in the pulse amp is *usually* the culprit in the
case of selection problems, the resistors run a close second. If you've replaced the capacitor and still have problems, I'd recommend replacing *all* the resistors in the pulse amp, as I've found they tend to degrade due to the heat inside the pulse amp chassis. The pulse amp is somewhat sensitive to variations in component values. Other problems external to the pulse amp are the 56k and 470k resistors under the chassis that connect to the pulse amp and 2050 tube sockets, and the coupling capacitor that connects to the pulse amp socket. If you pull the 12AX7 tube out of the socket while the mech is scanning, does the mech trip and switch into transfer/play mode? If so, the problem is likely isolated to the pulse amp itself. If not, you have more extensive work to do. You can purchase replacement resistors from mail-order sources such as Mouser Electronics (www.mouser.com). Joseph "Tony" Dziedzic In article , (shaun) wrote: Hi all, I've searched the group for info on the Pulse amp (in my AY160) causing selection problems. I've also followed the troubleshooting guide and have located ther issue as being the pulse amp (or so I think!) I've changed the cap in the unit and still no joy, someone has worked on this before as the 5m resistor is made up of 4 other restistoes but it comes to almost 5m. There is a small ferrite coil in there, looks like a transformer / choke and its busted up but it would appear that the windings are still ok. Anyone got any idea what that does and will it work if the case is broken? Any thoughts welcome Cheers Shaun |
#4
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Given the age of an AY160, I would HIGHLY recommend you completely rebuild the
tormat selection receiver chassis before running the unit. The huge power transformer on that chassis can be toasted by leaky filter capacitors inside the receiver chassis, and it's hard to find a replacement for that transformer. One note - the tormat receiver is a POSITIVE GROUND design - that means the filter capacitors have their POSITIVE lead connected to ground, which is opposite of most tube-type electronic equipment. I've seen a few cases where folks have replaced those and accidentally reversed polarity - not a pretty sight as the filter cap explodes! Joseph "Tony" Dziedzic In article , (shaun) wrote: Thanks for the info, I'll do the resistors as well then, when I pull the tube it doesn't trip so you reckon that may indicate work outside of the pulse amp? I've not looked inside the chassis that the pulse amp connects to, I wanted to get it selecting before I started the restoration but maybe I should just replace all caps and check all resistors and see how it goes post restoration Cheers Shaun |
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