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Rule of Thumb... if you can see the glow of the filaments, most likely you have power supply problems. If you don't see a glow of the filaments, and I mean all the tube filaments... you might have a power transformer problem. The filament glow but no audio is most times, an easier fix than...

This individual contacted me via my email. According to Sound Tech support which is not the original company any more, physically relocated some time ago and lost or misplaced and never recovered the majority of their service manuals, schematics, and bulletins so nothing available for ST164...

ST164 Info I’m pretty sure that SoundTech is farming out their repairs. In most cases they will recommend a repair station or a “Maverick” tech that is registered with Sound Tech for referrals. For older units like the 164, even these troubleshooters are going to find it difficult to repair...

I just finished Repairing an ST164 I was wondering if you had the manual that came with it and if not, I just received the owner's manual, pdf, and a power schematic from SoundTech. I just finished a major "major" repair of an ST164, and it was so screwed up that I took pictures of it's guts...