Sometimes my Dynaco PAS3 will loose the left channel either partly or completely. I use FM-MPX input. Like I say most of the time it works fine but sometimes it doesn’t. My tuner, cassette deck, dish TV, DVD player and computer inputs are collected to and distributed from a Radio Shack 6 position switch. To correct the left channel problem I turn the selector switch to TAPE HEAD and turn the volume up to about ¾. This produces a variable noise, a crackle then it is fixed. I purchased the unit used in about 1972 but recently have installed the SDS Labs capacitor diode upgrade adding the optional fuse. In addition new PC-5 & PC-6 boards and PC-5 tubes. I don’t use a phonograph with this system. I have moved the tubes around to no effect.
1. Any thoughts?
2. When I added the SDS Labs capacitor board I used 18 gauge stranded wire because it was available locally. It was a little thick. What gauge was used from Dynaco and what is it called? It is single stranded in my unit. I would intend to purchase it on the common auction site because it is easily available and replace the 18 gauge.
3. I have just finished a Gain Clone style system. I can now spend some time putting my pre amp back to right. In reading the Forum a new Volume Control Potentiometer was recommended. I have ordered this and will prophylactically replace the old one. I have the original manuals PAS3 & Stereo 70. I intend to check the voltages at the 12 AX7 tubes so with the unit on do the tubes need to be installed? Does there need to be either or both a live input or output to powered up amplifier?
4. Do the PC-5 & PC-6 boards interact with each other? Like I said I don’t use a phonograph with this system.
Any help will be appreciated. Thanks John
1. Any thoughts?
2. When I added the SDS Labs capacitor board I used 18 gauge stranded wire because it was available locally. It was a little thick. What gauge was used from Dynaco and what is it called? It is single stranded in my unit. I would intend to purchase it on the common auction site because it is easily available and replace the 18 gauge.
3. I have just finished a Gain Clone style system. I can now spend some time putting my pre amp back to right. In reading the Forum a new Volume Control Potentiometer was recommended. I have ordered this and will prophylactically replace the old one. I have the original manuals PAS3 & Stereo 70. I intend to check the voltages at the 12 AX7 tubes so with the unit on do the tubes need to be installed? Does there need to be either or both a live input or output to powered up amplifier?
4. Do the PC-5 & PC-6 boards interact with each other? Like I said I don’t use a phonograph with this system.
Any help will be appreciated. Thanks John
