Recent content by DHL

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    Spectral repair service

    For pre-amps and power amps the only electronic, non-moving part I can think of are the electrolytic filter capacitors. It also depends on how much older than 10 years the components are. Stuff built in the 80's or 90's should have those caps replaced with modern current capacitors. Just how bad...
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    Luxman AD8000, 8020 or 8030 transformers

    No one??? Well, I ended up buying an AD8000 and both 8020 and 8030 transformers from a Japanese EBay vendor. Really like the fact that you can use the transformer optimized for your cartridge (either 20 dB gain for moderate MC carts or 30 dB gain for low output carts). Got the whole setup for...
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    802 Diamond Deficencies?

    Some say the same about JBL. Some folks love them and some hate them. Back in the early 80's I had a pair of JBL L212s which I modified and dearly loved. Kept them for many years and finally had to move on after their surrounds disintegrated. I ended up with B&W 804s (non-"d"), and then...
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    Luxman AD8000, 8020 or 8030 transformers

    Anyone own or have heard the vintage Luxman AD8000 step up transformers? It looks like the AD8000 is the adapter wherein you mount either the 8020 (20dB gain) or the 8030 (30dB gain) transformers. Very cool system and seems to have SOT specs. Any comparison to something like the Ortofon ST-80...
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    Spectral DMC-10 mods

    Unfortunately, many manufacturers have to assume that their customers fit the "lowest common denominator", and that if you allow them access to the inner workings, they will screw them up. I find this attitude unfortunate, but sort of understand why they present it. I myself, having a reasonably...
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    Spectral DMC-10 mods

    Marty: Thank you very much for your kind words. I'm glad you can appreciate the time and effort I have invested in this project. With so much emphasis being placed by today's designers on IC based phono preamps, one almost has to resurrect older, classic products if one wants a Class A discrete...
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    Spectral DMC-10 mods

    Thanks for the suggestion.
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    Spectral DMC-10 mods part 3

    Photos of the modded amplifier:
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    Spectral DMC-10 mods part 2

    I have to break up my post due to the restriction on posting more than 5 photos, so continuing with the modde power supply The white box is the time delay relay which can be programmed for almost any delay time. The circuit puts a resistor in the primary of the transformers limiting start...
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    Spectral DMC-10 mods

    I recently purchased a Spectral DMC-10 based on some of the posts I found here, and the fact that circuit schematics were available for this particular model. The sonic performance of this pre-amp is well revered, and I wanted a Class A discrete design that was simple, relatively low cost, but...
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    Concentra I phono stage

    Budget. Trying to pick up something under $2K.
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    Concentra I phono stage

    I am looking at perhaps buying a Concentra I integrated amp. It has a phono stage option, but I can find no specs on it in the user's manual or on Jeff Roland site. Supposedly it has input loading options but again no info on where these are and how you change loadings. Anyone know where to find...
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    Luxman E-1 preamp

    That is what I heard, stay away from the 100V units. Besides the servicing angle, a step up transformer also interferes with the sound quality, apparently.
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    Luxman E-1 preamp

    Philip: Thanks. I missed getting one on EBay that had a starting price of $1500, but no one bid. I was still researching this along with some other choices when the auction ended, but the opportunity may be gone forever. Seems like the seller was really pissed no one bid, and even though I sent...
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    Luxman E-1 preamp

    Ran across one of these for sale. Any input on sound quality? There seems to be little to no reviews published on it. Is it still in production? Cannot find any current new listings for it, only the E-200 which appears to be a radically stripped down version. But the Japanese Luxman site has it...
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