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astromaddie

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About astromaddie

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  1. I think that's got me interested in modifying this to be more like your SRX-Plus, though I realise I'll be keeping it normal biased. Which brings me to my next question, after doing a lot of research.. Curious, Pirx, where did you get this schematic? I was comparing it with Jim's published schematic from the 2015 issues of AudioXchange and noticed a few differences... like the use of a 10M90S instead of a DN2540, and some other resistors are different (102ohm vs 250ohm, 1k vs 500, etc) -- plus the addition on the left taps into the -340V power supply with a 220k resistor. Can you help
  2. Makes sense. I wasn't sure if it would effect the overall output on extreme frequencies, or fine-control between frequencies. Hey Jim, thanks. I actually just got components in to put together the CCS mod. I was holding off on replying here until I got hold of your articles from AudioXpress in Nov/Dec 2015, for the SRX Plus, and I just started reading them. Do you think I'd have better returns putting the CCS mod into this SRX or the T1S I also have and will be recapping? I've been doing a lot of electrical studying and am really trying to wrap my head around everything conceptually he
  3. That’s what I figured, thanks! The amp arrived the other day and, wow, it sounds really good. I think I need to recap my T1S much more than I realised, because the sound on that is all wonky compared to this— peaky upper mids, way diminished bass. For the time being though, what actually is the downside of using Normal bias outputs with Pro Stax (particularly lambdas)? I noticed a rolled off treble and more smoothness, but I assume that’s moreso because of the tubes rather than the Normal bias— or is it?
  4. Thanks @spritzer! That’s cool to hear, I’ve read good things about the SRX— how difficult would it be to modify it for Pro bias? (or not worth the added effort?)
  5. I see, thanks for pointing that out @Pirx — can you go into more detail for someone with less circuitry experience? Is this something I should fix? Also @Craig Sawyers thats good to hear! Sounds like that bodes well that this will be a worthwhile, interesting purchase at least. I’m wondering how it’ll pair with my L700, or if I should just keep it with my SR3.
  6. Hi, been lurking for a while but finally signed up! Quick background on my gear: I'm in the Stax ecosystem with an L700(Mk1), SR-3, and an SRM-003. I also have a D10 and T1S, the latter of which was on a shelf unused in the original box for 25 years or so and last year I bought it. I'm still planning to recap it and upgrade it with the constant current mod, but that's to come soon. In the meanwhile, I came across a curiosity online, a homemade normal-bias tube amp. No real info provided, but it was a reasonable price so I took the shot in the dark, and I don't have the electronics kn
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