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General Asylum General audio topics that don't fit into specific categories. |
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General Asylum General audio topics that don't fit into specific categories. |
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In Reply to: Anyone familiar with Bedini or Counterpoint amps ? posted by Sean on March 11, 1999 at 00:21:06:
I used to own a Bedini 100/00 Diode Emitter amp. I am not familiar with the 250, but have seen several used at Stereo Exchange's web site. I believe that all Bedinis were based on the same general circuit design, with a noncomplementary output stage (output transistors are Motorola MJ15024 NPNs). This means that they all invert absolute polarity, so this will be an extra consideration in your triamp scheme. Bedinis got good reviews in Aczel's The Audio Critic (25/25 paired exceptionally well with original Quads, mostly because they were also polarity inverted) and Audio Alternative (45/45, in '78-80). Bedini's also had two power transformers, but they were wired together to form one transformer, rather than used as separate power supplies for each channel. I wasn't too fond of the tantalum input cap they used, so I replaced it with a Wonder Cap for a slight improvement. Although all Bedinis claimed Class A operation, there is no way that this was up to rated power for the 100/100. The diode emitter series replaced the output emitter resistors with large Motorola diodes (1N4004?; bias checked at 0.53 V across diode). For output protection and stability, they used series fuses, thermal breakers, and an inductor (belt and suspenders approach). The sound was smooth and forgiving; Bedinis flaws were those of omission. Transparency wasn't very good. This is about all I can remember off the top of my head.
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Follow Ups
- Re: Anyone familiar with Bedini or Counterpoint amps ? - Steve 03/11/9904:48:06 03/11/99 (2)
- Forgot to mention... - Steve 11:12:29 03/11/99 (1)
- Thanks for the info !!! - Sean 20:23:14 03/11/99 (0)
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