Vacuum Tube Amplifier Pioneer SM-83 Restoration

Posted on Feb 6, 2014

After restoring my Fisher 400, I could not let my smart head and creative hands rest. So I have started to look for another tube gear to apply my newly acquired skills. There was plenty of stuff around, but importing from USA to European Union is quite prohibitive - around $200 - $250 only for shipment plus domestic VAT and customs. I am was very

Vacuum Tube Amplifier Pioneer SM-83 Restoration
Click here to download the full size of the above Circuit.

eager to buy Sansui 1000a or Luxman, but none of them appeared in Europe for reasonable price level. So after all, I took a look at Pioneer SM-83 integrated tube amplifier, which time to time appear on eBay. I found a nice web site called "Fonar" in Poland which have quite detailed photos of internals, and I am was somewhat obsessed. Pioneer tube amp doesn`t have something I hate in other vintage devices - namely large can caps (or anything else) soldered or riveted straight to the chassis (its a hell work to remove them). Finally I have managed to buy one from France for 300 EURO. Additionally, I have occasionally met nice Finish radio junkie Jouko Kuisma which have bought the same amp in Germany. Of course, I have followed my own golden rules purchasing this Pioneer. However, it was not saved me from some unpleasant caveats. This kind of walkthrough is absolutely useless without high-resolution, detailed photos, and that represent a problem. Web pages with plenty of large graphics are slow to load, render and scroll. So I am posting medium-resolution photos straight on the page, with links to download larger (around 2500x1200) ones (for example, you can download photo above in full details). I am was thinking about slide-show on the 2nd linked page, or splitting article in 5+ separate pages, but this will be to cumbersome to navigate. Additionally, I have posted photo gallery with night shots of glowing tubes here. I...

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