People ask me what kind of gear I use at Retrovoltage and at Rain City Audio for projects. So, here we go: While it’s by no means the best-equipped workbench out there, it has a good mix of lab- and service-grade … Continue reading
Posted in Collections, Commentary, Test Equipment
Tagged atten, audio precision, bk precision, HP, LogiMetrics, photos, repair bench, sencore, tektronix, test equipment, workshop
This little Harman/Kardon Control Amplifier, model A-401, just came through the shop for a full overhaul. It was in a pretty sorry state to begin with – one channel distorted, one barely gasping for air, and a world of scratchy … Continue reading
Posted in Audio, Electronics, Hi-Fi, Projects, Stereo, Vintage
Tagged a-401, amp, amplifier, circuit boards, control amplifier, harman/kardon, hi-fi, photos, pictures, rebuild, restoration, stereo, stereo pictures, vintage stereo
Varistor from Harmony H500 Guitar Amplifier
1931 Radiola 82 IF Transformer. Hand-wound coils on a wooden coil form.
This equalizer got a full overhaul with new 1% precision resistors, electrolytic capacitors, audiophile-grade output capacitors, transistors, gold-plated RCA jacks, 4% silver solder for all connections, a thorough switch cleaning, and computerized frequency response testing and a listening burn-in to verify proper operation. It sounds just fantastic with a very dynamic and life-like presence that really draws you into the experience of the source material, just like the Bose 901 should.
Check it out at Rain City Audio Continue reading
Posted in Audio, Bose, Electronics, Stereo, Vintage
Tagged Bose, Bose 901, Bose Active Equalizer, Bose Equalizer, bose equalizer repair, capacitor replacement, photos, seattle vintage radio repair
I picked up a new shop toy just the other day, a Tektronix 575 Transistor-Curve Tracer. This is a piece of lab gear I’ll use to match transistors for their operating characteristics, and can also be used to analyze and … Continue reading