T avish d esign , llc made in u.S.A. Classic vacuum tube phono stage (mm / mc) owner’s manual (assembled).
1 t able of c ontents 1.Introduction & quick start 2 2.Safety considerations 3 3.Setup & operation 4 3.1. Initial setup 3.2. Operation 3.3. Tube replacement 4.Technical information 8 5.Warranty and service 10 6.Copyright, trademark, and disclaimers 11 manual release 5.1a (15 jan. 2016).
2 1 i ntroduction and q uick s tart thanks for buying the classic phono stage! Tavish design’s classic vacuum-tube phono stage is a passively-equalized, two-gain-stage design whose basic circuit topology has remained popular for more than 55 years. The reason for its endurance is simple: with approp...
3 2 s afety 1. To avoid the risk of electric shock, do not operate the amplifier without the top cover in place. This amplifier uses high voltages internally which could cause an electrical shock, possibly resulting in injury or death. Lethal voltages can remain in the electronics after the unit is ...
4 3s etup 3.1i nitial s etup setup consists of installing the tubes (if needed), selecting the moving magnet (mm) or moving coil (mc) input, and setting the cartridge loading and mc gain (if needed). The factory settings for these should work well with most mm cartridges, and with low-output mc cart...
5 cartridge loading and moving coil gain cartridge loading and the mc gain setting are set with internal dip switches. The factory settings for these should work well with most mm cartridges, and with low-output mc cartridges. To select other settings, unplug the unit and wait 10 minutes for the int...
6 mm load setting (s2) s2 positions (1 – 7) off = 0, on = 1 no added capacitance 0001000 47 pf 1001100 factory default 100 pf 0101010 147 pf 1101110 180 pf 0011001 227 pf 1011101 280 pf 0111011 327 pf 1111111 table 3.2: mm load settings. Mc load setting (s1) s1 positions (1 – 7) off = 0, on = 1 47.5...
7 3.2o peration if you removed the cover to adjust to set the cartridge loading and gain switches, you must replace it before operating the unit. To avoid a risk of electric shock, never operate the unit with the cover removed. When the unit is switched on, it goes through a 40 second warmup sequenc...
8 4t echnical i nformation parameter specification gain 41 db moving magnet 53 db high-output moving coil 61 db low-output moving coil riaa equalization accuracy ±0.5 db, 30 hz – 20 khz signal-to-noise ratio (a-weighted) >79 dba ref. 5 mv @ 1khz, moving magnet >79 dba ref. 1.25 mv @ 1khz, high-outpu...
9 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 10 100 1000 10000 riaa equalization error, db frequency, hz measured riaa equalization accuracy l1 r1 l2 r2 l3 r3 l4 r4 l5 r5 fig. 4.1: measured riaa equalization error for 5 units with 5 sets of jj tubes, left and right channels. Error is fig. 4.2: distortion spectru...
10 5 w arranty and s ervice 5.1w arranty with the exception of tubes, tavish design, llc (hereinafter “tavish design”) warrants to the consumer this product to be free of defects in materials or workmanship for a period of six (6) years from the date of purchase (6 months on tubes). If you discover ...
11 5.2s ervice please contact tavish design for service (in or out of warranty) if you believe your amplifier needs repair. Most technical issues can be resolved by email or phone. If your unit does require repair, we’ll issue a return merchandise authorization (rma) number, along with packing and s...
