I bought a PAS-2 a while back for my Dynaco ST-70. I know the st-70 worked because I tested it with a Mc preamp and it sounded very good. Thinking I may have a better match with a Dynaco preamp I bought the Pas-2 on the Bay. It sounds horrible like noise caused from dog and cat fighting!:sigh: This pre looked like somebody already did some modifications with rectifier and a few cap replacements (not all). As I don't want to mess with it I bought another PAS which is PAS-3 from a local guy who sold it as is. Another mistake.

The PAS-3 also sounded as bad. I opened it up and someone already modified it, too. Now I am stuck with 2 crappy preamps and don't know what to do. The only good thing about these pre's are they have the real and good Telefunken tubes. I bought a PAS-2 a while back for my Dynaco ST-70. I know the st-70 worked because I tested it with a Mc preamp and it sounded very good.

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Thinking I may have a better match with a Dynaco preamp I bought the Pas-2 on the Bay. It sounds horrible like noise caused from dog and cat fighting!:sigh: This pre looked like somebody already did some modifications with rectifier and a few cap replacements (not all). As I don't want to mess with it I bought another PAS which is PAS-3 from a local guy who sold it as is. Another mistake. The PAS-3 also sounded as bad. I opened it up and someone already modified it, too. Now I am stuck with 2 crappy preamps and don't know what to do.

The only good thing about these pre's are they have the real and good Telefunken tubes. Like they said.

Get the construction manual and go through the unit like you were building it for the first time. Reflow all the solder and so on. Replace the electrolytic caps in the bias supply. Make an evaluation of the filter can. Many of them are about cooked out. Do the diode conversion for the zener that is advised due to the predictable failure.

Substitute some modern film caps (no need to get boutique stuff). Pay attention to the switches which were/are a PITA — and they are OLD! There are better pre-amps on the planet for a price, but the PAS is very pleasent and VERY musical, even in stock form. If you slide over to Audio Asylum and look for the sponsored forums, you'll see Joe Curcio's 'Dynaco Doctor' forum. In the archives, there is more here about doing exactly what you are faced with than you ever imagined existed. And people will help too. You might think about one of Joe's boards or refresher kits and get it right.

Joe offers personal support on this site. I've got a PAS project going right now that is taking forever as other stuff comes and goes ahead of it. But eventually it will be a slightly altered unit in terms of the phono section. In fact, it will be a dedicated phono amp that will feed my Pioneer SA-8900. I've had this PAS for almost 20 years, and I love the sound of the phono circuit. There are some simple revisions for it described on AA and in the AVA archive (van Alstine).