6, Skogrand, Viero, Kubala-Sosna, Audience Au24SX, Genesis Advanced Technologies and Ensemble Power Cords Assorted cables including Transparent XL Gen.
Technics RS1506 with Flux Magnetic heads, Doshi V3.0 tape stage (balanced) 2, vdh Colibri Master Signature, MutechHayabusa, MOFI Master Tracker, Sumiko Songbird cartridges
The exposed pins on top of the 829B are a definite safety hazard. I would highly recommend the Bottlehead kits. Do not attempt to build this amplifier unless you have already built several other amplifiers, preferably kits so that you can learn good techniques. VPI 12-inch 3D Fat Boy dual pivot tonearm, VPI 12-inch 3D Fat Boy gimballed and SAT LM-12 arm This amp operates at very high voltages that can kill you. Goldmund Mimesis 37S Nextgen preamplifier A sweep tape is more revealing but observing/measuring the results can be a real bi.h. Unfortunately, a test tape with tones may not have all you need in the low range. I've found that the final low frequency response becomes a tradeoff between "taming" the main head bump (usually around 60hz) and rolling off ALL the lows (below 100hz) too much. This other R may have to be increased or switched out for IEC. The lows are another matter because you have the the response "bump" of the playback head "added to" the EQ curve applied to the tape, To mitigate this, I've found that either loading the head with a resistor (try starting with 10K), OR a much higher value (180K) across the C. Then put in a switch to select between values. These kits are sold prebuilt for 250 or 150 in kit version at. There are three pairs of inputs and one pair of outputs. With the DC filaments on the StereomourII, the. It sounds a lot better than you would think for the price.
Bottlehead amp schematics series#
Practically, if you're using a series RC for the feedback network and you have it set pretty close for NAB and assuming that the R primarily effects the high frequencies (HF), try reducing it till you get the HF response above 1Khz "decently smooth" for IEC. Here is a quick little project that I pulled together so we could see just how power hungry headphones (like Hifi Men and their ilk) sound on our lovely sounding directly heated triode amplifiers. If you compare the IEC and NAB curves after normalizing them both to 1Khz, you will see that up at the high frequencies the IEC is below the NAB by only a few dB.
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