Since the late 60's, I've always enjoyed Dynaco audio gear. When I made a little money around 1965, I bought the now classic Stereo 70 amp and PAS-3 preamp kits, tube sound upgraded with Van Alstine mods in the 90's (more in another post).
Recently I completed upgrades on the 1970's Dynaco solid state components, a PAT-5 preamp (already at the BI-FET stage) and an older Stereo 120 amplifier I bought used for $20. The upgrades came via Update My Dynaco, and they are extensive. The PAT-5 involved a new power supply board and gold plated jack field.
The Stereo 120 was more involved. Basically, the old amp was stripped internally and a new power supply and new amplifier modules installed. The modules are based on the LM3886 chip amplifier, which seems quite popular with amp builders. An LED power meter was added to the cover.
Of course, newly updated components require new speakers! I've always wanted Wharfedale Diamond 225s, speakers that are very highly rated for sound quality and at a very reasonable price. For source material, I've collected a number of 24/96 sound files, along with some CD quality test music I've always thought sounded great. The files are loaded onto a iPod touch and fed via Lightning digital connection to an Oppo HA-2 DAC (under the iPod). Then analog to the PAT-5.
I added my old FM-5 which continues to work just fine, although who listens to FM radio anymore(!?) But, along with the Stereo 120 LED meter, I get some glowing and some flashing lights... real cool!
Finally, the whole system sounds great! I'm thoroughly enjoying listening to this combo, and get great pleasure from old audio component friends newly revived and performing so well. Thanks to Dan Joffe at Update My Dynaco.
Flash! Dan has just announced new line cards for the PAT-5... just after I finished with the last mods! Oh, well, at some point I'll want to fire up the old soldering iron...